{"pageNumber":"965","pageRowStart":"24100","pageSize":"25","recordCount":40811,"records":[{"id":70032799,"text":"70032799 - 2007 - Temporal and spatial aspects of peatland initiation following deglaciation in North America","interactions":[],"lastModifiedDate":"2012-03-12T17:21:24","indexId":"70032799","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3219,"text":"Quaternary Science Reviews","active":true,"publicationSubtype":{"id":10}},"title":"Temporal and spatial aspects of peatland initiation following deglaciation in North America","docAbstract":"A set of simple ecological models accounts well for the cumulative initiation of peatlands throughout North America in relation to glacial retreat. The most parsimonious form incorporates, first, a delay term to account for the lag during which newly deglaciated land became suitable for peatland initiation and, second, an intrinsic rate of initiation related to the probability of migration and establishment of plant propagules from elsewhere. The goodness of fit of the models, based on 1680 basal-peat dates throughout the continent, allows projection of past trends into the future. Factors contributing to the lag of about 4000 years between deglaciation and peatland initiation are suggested and data on colonization of deglaciated land by beavers (known to initiate peatlands) are presented. The rate of peatland initiation peaked between 7000 and 8000 years ago, but remains appreciable today. A marked depression of peatland initiation (8360-8040 BP) interrupted the peak rate. The time of the interruption matches the 8200 BP cold-dry event recorded in Greenland ice cores, and suggests that this event caused a substantial, continent-wide depression of an important ecosystem function, i.e., carbon sequestration from the atmosphere by peat deposition. Spontaneous initiation of new peatlands is projected to continue for millennia to come. ?? 2006 Elsevier Ltd. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Quaternary Science Reviews","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.quascirev.2006.08.008","issn":"02773791","usgsCitation":"Gorham, E., Lehman, C., Dyke, A., Janssens, J., and Dyke, L., 2007, Temporal and spatial aspects of peatland initiation following deglaciation in North America: Quaternary Science Reviews, v. 26, no. 3-4, p. 300-311, https://doi.org/10.1016/j.quascirev.2006.08.008.","startPage":"300","endPage":"311","numberOfPages":"12","costCenters":[],"links":[{"id":241497,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213836,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.quascirev.2006.08.008"}],"volume":"26","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505ba4ece4b08c986b32068a","contributors":{"authors":[{"text":"Gorham, E.","contributorId":35501,"corporation":false,"usgs":true,"family":"Gorham","given":"E.","email":"","affiliations":[],"preferred":false,"id":437959,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Lehman, C.","contributorId":75342,"corporation":false,"usgs":true,"family":"Lehman","given":"C.","email":"","affiliations":[],"preferred":false,"id":437963,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Dyke, A.","contributorId":49190,"corporation":false,"usgs":true,"family":"Dyke","given":"A.","affiliations":[],"preferred":false,"id":437961,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Janssens, J.","contributorId":65291,"corporation":false,"usgs":true,"family":"Janssens","given":"J.","email":"","affiliations":[],"preferred":false,"id":437962,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Dyke, L.","contributorId":45910,"corporation":false,"usgs":true,"family":"Dyke","given":"L.","email":"","affiliations":[],"preferred":false,"id":437960,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70032798,"text":"70032798 - 2007 - Carbon export and cycling by the Yukon, Tanana, and Porcupine rivers, Alaska, 2001-2005","interactions":[],"lastModifiedDate":"2018-04-03T17:20:23","indexId":"70032798","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3722,"text":"Water Resources Research","onlineIssn":"1944-7973","printIssn":"0043-1397","active":true,"publicationSubtype":{"id":10}},"title":"Carbon export and cycling by the Yukon, Tanana, and Porcupine rivers, Alaska, 2001-2005","docAbstract":"<p><span>Loads and yields of dissolved and particulate organic and inorganic carbon (DOC, POC, DIC, PIC) were measured and modeled at three locations on the Yukon River (YR) and on the Tanana and Porcupine rivers (TR, PR) in Alaska during 2001–2005. Total YR carbon export averaged 7.8 Tg C yr</span><sup>−1</sup><span>, 30% as OC and 70% as IC. Total C yields (0.39–1.03 mol C m</span><sup>−2</sup><span><span>&nbsp;</span>yr</span><sup>−1</sup><span>) were proportional to water yields (139–356 mm yr</span><sup>−1</sup><span>; r</span><sup>2</sup><span><span>&nbsp;</span>= 0.84) at all locations. Summer DOC had an aged component (fraction modern (FM) = 0.94–0.97), except in the permafrost wetland‐dominated PR, where DOC was modern. POC had FM = 0.63–0.70. DOC had high concentration, high aromaticity, and high hydrophobic content in spring and low concentration, low aromaticity, and high hydrophilic content in winter. About half of annual DOC export occurred during spring. DIC concentration and isotopic composition were strongly affected by dissolution of suspended carbonates in glacial meltwater during summer.</span></p>","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2006WR005201","usgsCitation":"Striegl, R.G., Dornblaser, M.M., Aiken, G.R., Wickland, K.P., and Raymond, P.A., 2007, Carbon export and cycling by the Yukon, Tanana, and Porcupine rivers, Alaska, 2001-2005: Water Resources Research, v. 43, no. 2, Article W02411; 9 p., https://doi.org/10.1029/2006WR005201.","productDescription":"Article W02411; 9 p.","costCenters":[],"links":[{"id":477222,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2006wr005201","text":"Publisher Index Page"},{"id":241465,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"43","issue":"2","noUsgsAuthors":false,"publicationDate":"2007-02-10","publicationStatus":"PW","scienceBaseUri":"5059f363e4b0c8380cd4b789","contributors":{"authors":[{"text":"Striegl, Robert G. 0000-0002-8251-4659 rstriegl@usgs.gov","orcid":"https://orcid.org/0000-0002-8251-4659","contributorId":1630,"corporation":false,"usgs":true,"family":"Striegl","given":"Robert","email":"rstriegl@usgs.gov","middleInitial":"G.","affiliations":[{"id":36183,"text":"Hydro-Ecological Interactions Branch","active":true,"usgs":true},{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true},{"id":200,"text":"Coop Res Unit Seattle","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"preferred":false,"id":437958,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Dornblaser, Mark M. 0000-0002-6298-3757 mmdornbl@usgs.gov","orcid":"https://orcid.org/0000-0002-6298-3757","contributorId":1636,"corporation":false,"usgs":true,"family":"Dornblaser","given":"Mark","email":"mmdornbl@usgs.gov","middleInitial":"M.","affiliations":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true}],"preferred":true,"id":437956,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Aiken, George R. 0000-0001-8454-0984 graiken@usgs.gov","orcid":"https://orcid.org/0000-0001-8454-0984","contributorId":1322,"corporation":false,"usgs":true,"family":"Aiken","given":"George","email":"graiken@usgs.gov","middleInitial":"R.","affiliations":[{"id":191,"text":"Colorado Water Science Center","active":true,"usgs":true},{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"preferred":true,"id":437955,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Wickland, Kimberly P. 0000-0002-6400-0590 kpwick@usgs.gov","orcid":"https://orcid.org/0000-0002-6400-0590","contributorId":1835,"corporation":false,"usgs":true,"family":"Wickland","given":"Kimberly","email":"kpwick@usgs.gov","middleInitial":"P.","affiliations":[{"id":36183,"text":"Hydro-Ecological Interactions Branch","active":true,"usgs":true},{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true}],"preferred":true,"id":437954,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Raymond, Peter A.","contributorId":172876,"corporation":false,"usgs":false,"family":"Raymond","given":"Peter","email":"","middleInitial":"A.","affiliations":[{"id":17883,"text":"Yale School of Forestry and Environmental Studies, New Haven, CT","active":true,"usgs":false}],"preferred":false,"id":437957,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70032796,"text":"70032796 - 2007 - Phase equilibria constraints on the chemical and physical evolution of the campanian ignimbrite","interactions":[],"lastModifiedDate":"2012-03-12T17:21:24","indexId":"70032796","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2420,"text":"Journal of Petrology","active":true,"publicationSubtype":{"id":10}},"title":"Phase equilibria constraints on the chemical and physical evolution of the campanian ignimbrite","docAbstract":"The Campanian Ignimbrite is a > 200 km3 trachyte-phonolite pyroclastic deposit that erupted at 39.3 ?? 0.1 ka within the Campi Flegrei west of Naples, Italy. Here we test the hypothesis that Campanian Ignimbrite magma was derived by isobaric crystal fractionation of a parental basaltic trachyandesitic melt that reacted and came into local equilibrium with small amounts (5-10 wt%) of crustal rock (skarns and foid-syenites) during crystallization. Comparison of observed crystal and magma compositions with results of phase equilibria assimilation-fractionation simulations (MELTS) is generally very good. Oxygen fugacity was approximately buffered along QFM+1 (where QFM is the quartz-fayalite-magnetite buffer) during isobaric fractionation at 0.15 GPa (???6 km depth). The parental melt, reconstructed from melt inclusion and host clinopyroxene compositions, is found to be basaltic trachyandesite liquid (51.1 wt% SiO2, 9.3 wt% MgO, 3 wt% H2O). A significant feature of phase equilibria simulations is the existence of a pseudo-invariant temperature, ???883??C, at which the fraction of melt remaining in the system decreases abruptly from ???0.5 to < 0.1. Crystallization at the pseudo-invariant point leads to abrupt changes in the composition, properties (density, dissolved water content), and physical state (viscosity, volume fraction fluid) of melt and magma. A dramatic decrease in melt viscosity (from 1700 Pa s to ???200 Pa s), coupled with a change in the volume fraction of water in magma (from ??? 0.1 to 0.8) and a dramatic decrease in melt and magma density acted as a destabilizing eruption trigger. Thermal models suggest a timescale of ??? 200 kyr from the beginning of fractionation until eruption, leading to an apparent rate of evolved magma generation of about 10-3 km3/year. In situ crystallization and crystal settling in density-stratified regions, as well as in convectively mixed, less evolved subjacent magma, operate rapidly enough to match this apparent volumetric rate of evolved magma production. ?? Copyright 2007 Oxford University Press.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Petrology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1093/petrology/egl068","issn":"00223530","usgsCitation":"Fowler, S.J., Spera, F., Bohrson, W., Belkin, H., and de Vivo, B., 2007, Phase equilibria constraints on the chemical and physical evolution of the campanian ignimbrite: Journal of Petrology, v. 48, no. 3, p. 459-493, https://doi.org/10.1093/petrology/egl068.","startPage":"459","endPage":"493","numberOfPages":"35","costCenters":[],"links":[{"id":477036,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1093/petrology/egl068","text":"Publisher Index Page"},{"id":241430,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213772,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1093/petrology/egl068"}],"volume":"48","issue":"3","noUsgsAuthors":false,"publicationDate":"2006-11-13","publicationStatus":"PW","scienceBaseUri":"505a787ae4b0c8380cd786e4","contributors":{"authors":[{"text":"Fowler, S. J.","contributorId":18586,"corporation":false,"usgs":false,"family":"Fowler","given":"S.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":437944,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Spera, F. J.","contributorId":89315,"corporation":false,"usgs":false,"family":"Spera","given":"F. J.","affiliations":[],"preferred":false,"id":437947,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Bohrson, W.A.","contributorId":102092,"corporation":false,"usgs":false,"family":"Bohrson","given":"W.A.","affiliations":[],"preferred":false,"id":437948,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Belkin, H. E. 0000-0001-7879-6529","orcid":"https://orcid.org/0000-0001-7879-6529","contributorId":38160,"corporation":false,"usgs":true,"family":"Belkin","given":"H. E.","affiliations":[],"preferred":false,"id":437945,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"de Vivo, B.","contributorId":50549,"corporation":false,"usgs":false,"family":"de Vivo","given":"B.","affiliations":[],"preferred":false,"id":437946,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70032794,"text":"70032794 - 2007 - Simulation of Intra- or transboundary surface-water-rights hierarchies using the farm process for MODFLOW-2000","interactions":[],"lastModifiedDate":"2018-09-27T11:10:26","indexId":"70032794","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2501,"text":"Journal of Water Resources Planning and Management","active":true,"publicationSubtype":{"id":10}},"title":"Simulation of Intra- or transboundary surface-water-rights hierarchies using the farm process for MODFLOW-2000","docAbstract":"<div class=\"NLM_sec NLM_sec_level_1 hlFld-Abstract\"><p>Water-rights driven surface-water allocations for irrigated agriculture can be simulated using the farm process for MODFLOW-2000. This paper describes and develops a model, which simulates routed surface-water deliveries to farms limited by streamflow, equal-appropriation allotments, or a ranked prior-appropriation system. Simulated diversions account for deliveries to all farms along a canal according to their water-rights ranking and for conveyance losses and gains. Simulated minimum streamflow requirements on diversions help guarantee supplies to senior farms located on downstream diverting canals. Prior appropriation can be applied to individual farms or to groups of farms modeled as “virtual farms” representing irrigation districts, irrigated regions in transboundary settings, or natural vegetation habitats. The integrated approach of jointly simulating canal diversions, surface-water deliveries subject to water-rights constraints, and groundwater allocations is verified on numerical experiments based on a realistic, but hypothetical, system of ranked virtual farms. Results are discussed in light of transboundary water appropriation and demonstrate the approach’s suitability for simulating effects of water-rights hierarchies represented by international treaties, interstate stream compacts, intrastate water rights, or ecological requirements.</p></div>","language":"English","publisher":"ASCE","doi":"10.1061/(ASCE)0733-9496(2007)133:2(166)","issn":"07339496","usgsCitation":"Schmid, W., and Hanson, R.T., 2007, Simulation of Intra- or transboundary surface-water-rights hierarchies using the farm process for MODFLOW-2000: Journal of Water Resources Planning and Management, v. 133, no. 2, p. 166-178, https://doi.org/10.1061/(ASCE)0733-9496(2007)133:2(166).","productDescription":"13 p.","startPage":"166","endPage":"178","costCenters":[{"id":154,"text":"California Water Science Center","active":true,"usgs":true}],"links":[{"id":213771,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1061/(ASCE)0733-9496(2007)133:2(166)"},{"id":241428,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"133","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b8ffde4b08c986b31925a","contributors":{"authors":[{"text":"Schmid, W.","contributorId":103479,"corporation":false,"usgs":true,"family":"Schmid","given":"W.","email":"","affiliations":[],"preferred":false,"id":437942,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hanson, R. T.","contributorId":91148,"corporation":false,"usgs":true,"family":"Hanson","given":"R.","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":437941,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70032770,"text":"70032770 - 2007 - Long-term limnological research and monitoring at Crater Lake, Oregon","interactions":[],"lastModifiedDate":"2017-11-15T13:23:06","indexId":"70032770","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1919,"text":"Hydrobiologia","onlineIssn":"1573-5117","printIssn":"0018-8158","active":true,"publicationSubtype":{"id":10}},"title":"Long-term limnological research and monitoring at Crater Lake, Oregon","docAbstract":"Crater Lake is located in the caldera of Mount Mazama in Crater Lake National Park, Oregon. The lake has a surface area of about 53 km2at an elevation of 1882 m and a maximum depth of 594 m. Limited studies of this ultraoligotrophic lake conducted between 1896 and 1981, lead to a 10-year limnological study to evaluate any potential degradation of water quality. No long-term variations in water quality were observed that could be attributed to anthropogenic activity. Building on the success of this study, a permanent limnological program has been established with a long-term monitoring program to insure a reliable data base for use in the future. Of equal importance, this program serves as a research platform to develop and communicate to the public a better understanding of the coupled biological, physical, and geochemical processes in the lake and its surrounding environment. This special volume represents our current state of knowledge of the status of this pristine ecosystem including its special optical properties, algal nutrient limitations, pelagic bacteria, and models of the inter-relationships of thermal properties, nutrients, phytoplankton, deep-water mixing, and water budgets. ?? 2007 Springer Science+Business Media B.V.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Hydrobiologia","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s10750-006-0342-6","issn":"00188158","usgsCitation":"Larson, G., Collier, R., and Buktenica, M., 2007, Long-term limnological research and monitoring at Crater Lake, Oregon: Hydrobiologia, v. 574, no. 1, p. 1-11, https://doi.org/10.1007/s10750-006-0342-6.","startPage":"1","endPage":"11","numberOfPages":"11","costCenters":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"links":[{"id":241604,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213929,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s10750-006-0342-6"}],"volume":"574","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a4998e4b0c8380cd68750","contributors":{"authors":[{"text":"Larson, G.L.","contributorId":103021,"corporation":false,"usgs":true,"family":"Larson","given":"G.L.","email":"","affiliations":[],"preferred":false,"id":437834,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Collier, R.","contributorId":36370,"corporation":false,"usgs":true,"family":"Collier","given":"R.","email":"","affiliations":[],"preferred":false,"id":437832,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Buktenica, M.","contributorId":76148,"corporation":false,"usgs":true,"family":"Buktenica","given":"M.","affiliations":[],"preferred":false,"id":437833,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70032768,"text":"70032768 - 2007 - Seismicity associated with the Sumatra-Andaman Islands earthquake of 26 December 2004","interactions":[],"lastModifiedDate":"2012-03-12T17:21:23","indexId":"70032768","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1135,"text":"Bulletin of the Seismological Society of America","onlineIssn":"1943-3573","printIssn":"0037-1106","active":true,"publicationSubtype":{"id":10}},"title":"Seismicity associated with the Sumatra-Andaman Islands earthquake of 26 December 2004","docAbstract":"The U.S. Geological Survey/National Earthquake Information Center (USGS/ NEIC) had computed origins for 5000 earthquakes in the Sumatra-Andaman Islands region in the first 36 weeks after the Sumatra-Andaman Islands mainshock of 26 December 2004. The cataloging of earthquakes of mb (USGS) 5.1 and larger is essentially complete for the time period except for the first half-day following the 26 December mainshock, a period of about two hours following the Nias earthquake of 28 March 2005, and occasionally during the Andaman Sea swarm of 26-30 January 2005. Moderate and larger (mb ???5.5) aftershocks are absent from most of the deep interplate thrust faults of the segments of the Sumatra-Andaman Islands subduction zone on which the 26 December mainshock occurred, which probably reflects nearly complete release of elastic strain on the seismogenic interplate-thrust during the mainshock. An exceptional thrust-fault source offshore of Banda Aceh may represent a segment of the interplate thrust that was bypassed during the mainshock. The 26 December mainshock triggered a high level of aftershock activity near the axis of the Sunda trench and the leading edge of the overthrust Burma plate. Much near-trench activity is intraplate activity within the subducting plate, but some shallow-focus, near-trench, reverse-fault earthquakes may represent an unusual seismogenic release of interplate compressional stress near the tip of the overriding plate. The interplate-thrust Nias earthquake of 28 March 2005, in contrast to the 26 December aftershock sequence, was followed by many interplate-thrust aftershocks along the length of its inferred rupture zone.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Bulletin of the Seismological Society of America","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1785/0120050626","issn":"00371106","usgsCitation":"Dewey, J.W., Choy, G., Presgrave, B., Sipkin, S., Tarr, A., Benz, H., Earle, P., and Wald, D., 2007, Seismicity associated with the Sumatra-Andaman Islands earthquake of 26 December 2004: Bulletin of the Seismological Society of America, v. 97, no. 1 A SUPPL., https://doi.org/10.1785/0120050626.","costCenters":[],"links":[{"id":213927,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1785/0120050626"},{"id":241602,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"97","issue":"1 A SUPPL.","noUsgsAuthors":false,"publicationDate":"2007-01-01","publicationStatus":"PW","scienceBaseUri":"505b8b92e4b08c986b317932","contributors":{"authors":[{"text":"Dewey, J. W.","contributorId":31008,"corporation":false,"usgs":true,"family":"Dewey","given":"J.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":437822,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Choy, G.","contributorId":93691,"corporation":false,"usgs":true,"family":"Choy","given":"G.","affiliations":[],"preferred":false,"id":437828,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Presgrave, B.","contributorId":38024,"corporation":false,"usgs":true,"family":"Presgrave","given":"B.","email":"","affiliations":[],"preferred":false,"id":437824,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Sipkin, S.","contributorId":71065,"corporation":false,"usgs":true,"family":"Sipkin","given":"S.","email":"","affiliations":[],"preferred":false,"id":437826,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Tarr, Arthur C.","contributorId":75903,"corporation":false,"usgs":true,"family":"Tarr","given":"Arthur C.","affiliations":[],"preferred":false,"id":437827,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Benz, H.","contributorId":61953,"corporation":false,"usgs":true,"family":"Benz","given":"H.","email":"","affiliations":[],"preferred":false,"id":437825,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Earle, P.","contributorId":26860,"corporation":false,"usgs":true,"family":"Earle","given":"P.","email":"","affiliations":[],"preferred":false,"id":437821,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Wald, D. 0000-0002-1454-4514","orcid":"https://orcid.org/0000-0002-1454-4514","contributorId":37866,"corporation":false,"usgs":true,"family":"Wald","given":"D.","affiliations":[],"preferred":false,"id":437823,"contributorType":{"id":1,"text":"Authors"},"rank":8}]}}
,{"id":70032767,"text":"70032767 - 2007 - Wind erodibility of soils at Fort Irwin, California (Mojave Desert), USA, before and after trampling disturbance: Implications for land management","interactions":[],"lastModifiedDate":"2012-03-12T17:21:24","indexId":"70032767","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1425,"text":"Earth Surface Processes and Landforms","active":true,"publicationSubtype":{"id":10}},"title":"Wind erodibility of soils at Fort Irwin, California (Mojave Desert), USA, before and after trampling disturbance: Implications for land management","docAbstract":"Recently disturbed and 'control' (i.e. less recently disturbed) soils in the Mojave Desert were compared for their vulnerability to wind erosion, using a wind tunnel, before and after being experimentally trampled. Before trampling, control sites had greater cyanobacterial biomass, soil surface stability, threshold friction velocities (TFV, i.e. the wind speed required to move soil particles), and sediment yield than sites that had been more recently disturbed by military manoeuvres. After trampling, all sites showed a large drop in TFVs and a concomitant increase in sediment yield. Simple correlation analyses showed that the decline in TFVs and the rise in sediment yield were significantly related to cyanobacterial biomass (as indicated by soil chlorophyll a). However, chlorophyll a amounts were very low compared to chlorophyll a amounts found at cooler desert sites, where chlorophyll a is often the most important factor in determining TFV and sediment yield. Multiple regression analyses showed that other factors at Fort Irwin were more important than cyanobacterial biomass in determining the overall site susceptibility to wind erosion. These factors included soil texture (especially the fine, medium and coarse sand fractions), rock cover, and the inherent stability of the soil (as indicated by subsurface soil stability tests). Thus, our results indicate that there is a threshold of biomass below which cyanobacterial crusts are not the dominant factor in soil vulnerability to wind erosion. Most undisturbed soil surfaces in the Mojave Desert region produce very little sediment, but even moderate disturbance increases soil loss from these sites. Because current weathering rates and dust inputs are very low, soil formation rates are low as well. Therefore, soil loss in this region is likely to have long-term effects.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Earth Surface Processes and Landforms","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1002/esp.1372","issn":"01979337","usgsCitation":"Belnap, J., Phillips, S.L., Herrick, J.E., and Johansen, J., 2007, Wind erodibility of soils at Fort Irwin, California (Mojave Desert), USA, before and after trampling disturbance: Implications for land management: Earth Surface Processes and Landforms, v. 32, no. 1, p. 75-84, https://doi.org/10.1002/esp.1372.","startPage":"75","endPage":"84","numberOfPages":"10","costCenters":[],"links":[{"id":477185,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1002/esp.1372","text":"Publisher Index Page"},{"id":213898,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1002/esp.1372"},{"id":241568,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"32","issue":"1","noUsgsAuthors":false,"publicationDate":"2006-06-29","publicationStatus":"PW","scienceBaseUri":"505bd122e4b08c986b32f259","contributors":{"authors":[{"text":"Belnap, J. 0000-0001-7471-2279","orcid":"https://orcid.org/0000-0001-7471-2279","contributorId":23872,"corporation":false,"usgs":true,"family":"Belnap","given":"J.","affiliations":[],"preferred":false,"id":437817,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Phillips, S. L.","contributorId":94460,"corporation":false,"usgs":true,"family":"Phillips","given":"S.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":437820,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Herrick, J. E.","contributorId":84709,"corporation":false,"usgs":true,"family":"Herrick","given":"J.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":437819,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Johansen, J.R.","contributorId":25773,"corporation":false,"usgs":true,"family":"Johansen","given":"J.R.","email":"","affiliations":[],"preferred":false,"id":437818,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70032765,"text":"70032765 - 2007 - Hydrothermal fluid flow and deformation in large calderas: Inferences from numerical simulations","interactions":[],"lastModifiedDate":"2023-10-04T11:09:28.693382","indexId":"70032765","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2314,"text":"Journal of Geophysical Research B: Solid Earth","active":true,"publicationSubtype":{"id":10}},"title":"Hydrothermal fluid flow and deformation in large calderas: Inferences from numerical simulations","docAbstract":"<div class=\"\"><div class=\"article-section__content en main\"><p><span class=\"paraNumber\">[1]<span>&nbsp;</span></span>Inflation and deflation of large calderas is traditionally interpreted as being induced by volume change of a discrete source embedded in an elastic or viscoelastic half-space, though it has also been suggested that hydrothermal fluids may play a role. To test the latter hypothesis, we carry out numerical simulations of hydrothermal fluid flow and poroelastic deformation in calderas by coupling two numerical codes: (1) TOUGH2 [Pruess et al., 1999], which simulates flow in porous or fractured media, and (2) BIOT2 [Hsieh, 1996], which simulates fluid flow and deformation in a linearly elastic porous medium. In the simulations, high-temperature water (350°C) is injected at variable rates into a cylinder (radius 50 km, height 3–5 km). A sensitivity analysis indicates that small differences in the values of permeability and its anisotropy, the depth and rate of hydrothermal injection, and the values of the shear modulus may lead to significant variations in the magnitude, rate, and geometry of ground surface displacement, or uplift. Some of the simulated uplift rates are similar to observed uplift rates in large calderas, suggesting that the injection of aqueous fluids into the shallow crust may explain some of the deformation observed in calderas.</p></div></div>","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2006JB004689","issn":"01480227","usgsCitation":"Hurwitz, S., Christiansen, L., and Hsieh, P.A., 2007, Hydrothermal fluid flow and deformation in large calderas: Inferences from numerical simulations: Journal of Geophysical Research B: Solid Earth, v. 112, no. B2, 16 p., https://doi.org/10.1029/2006JB004689.","productDescription":"16 p.","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":615,"text":"Volcano Hazards Program","active":true,"usgs":true}],"links":[{"id":241532,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"112","issue":"B2","noUsgsAuthors":false,"publicationDate":"2007-02-24","publicationStatus":"PW","scienceBaseUri":"505a379ee4b0c8380cd6100c","contributors":{"authors":[{"text":"Hurwitz, Shaul 0000-0001-5142-6886 shaulh@usgs.gov","orcid":"https://orcid.org/0000-0001-5142-6886","contributorId":2169,"corporation":false,"usgs":true,"family":"Hurwitz","given":"Shaul","email":"shaulh@usgs.gov","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true},{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":true,"id":437814,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Christiansen, L.B.","contributorId":37952,"corporation":false,"usgs":true,"family":"Christiansen","given":"L.B.","email":"","affiliations":[],"preferred":false,"id":437812,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hsieh, Paul A. 0000-0003-4873-4874 pahsieh@usgs.gov","orcid":"https://orcid.org/0000-0003-4873-4874","contributorId":1634,"corporation":false,"usgs":true,"family":"Hsieh","given":"Paul","email":"pahsieh@usgs.gov","middleInitial":"A.","affiliations":[{"id":37277,"text":"WMA - Earth System Processes Division","active":true,"usgs":true},{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true},{"id":39113,"text":"WMA - Office of Quality Assurance","active":true,"usgs":true}],"preferred":true,"id":437813,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70032763,"text":"70032763 - 2007 - Assessing exotic plant species invasions and associated soil characteristics: A case study in eastern Rocky Mountain National Park, Colorado, USA, using the pixel nested plot design","interactions":[],"lastModifiedDate":"2012-03-12T17:21:24","indexId":"70032763","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":846,"text":"Applied Soil Ecology","active":true,"publicationSubtype":{"id":10}},"title":"Assessing exotic plant species invasions and associated soil characteristics: A case study in eastern Rocky Mountain National Park, Colorado, USA, using the pixel nested plot design","docAbstract":"Rocky Mountain National Park (RMNP), Colorado, USA, contains a diversity of plant species. However, many exotic plant species have become established, potentially impacting the structure and function of native plant communities. Our goal was to quantify patterns of exotic plant species in relation to native plant species, soil characteristics, and other abiotic factors that may indicate or predict their establishment and success. Our research approach for field data collection was based on a field plot design called the pixel nested plot. The pixel nested plot provides a link to multi-phase and multi-scale spatial modeling-mapping techniques that can be used to estimate total species richness and patterns of plant diversity at finer landscape scales. Within the eastern region of RMNP, in an area of approximately 35,000 ha, we established a total of 60 pixel nested plots in 9 vegetation types. We used canonical correspondence analysis (CCA) and multiple linear regressions to quantify relationships between soil characteristics and native and exotic plant species richness and cover. We also used linear correlation, spatial autocorrelation and cross correlation statistics to test for the spatial patterns of variables of interest. CCA showed that exotic species were significantly (P < 0.05) associated with photosynthetically active radiation (r = 0.55), soil nitrogen (r = 0.58) and bare ground (r = -0.66). Pearson's correlation statistic showed significant linear relationships between exotic species, organic carbon, soil nitrogen, and bare ground. While spatial autocorrelations indicated that our 60 pixel nested plots were spatially independent, the cross correlation statistics indicated that exotic plant species were spatially associated with bare ground, in general, exotic plant species were most abundant in areas of high native species richness. This indicates that resource managers should focus on the protection of relatively rare native rich sites with little canopy cover, and fertile soils. Using the pixel nested plot approach for data collection can facilitate the ecological monitoring of these vulnerable areas at the landscape scale in a time- and cost-effective manner. ?? 2006 Elsevier B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Applied Soil Ecology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.apsoil.2006.09.009","issn":"09291393","usgsCitation":"Kalkhan, M.A., Stafford, E., Woodly, P., and Stohlgren, T., 2007, Assessing exotic plant species invasions and associated soil characteristics: A case study in eastern Rocky Mountain National Park, Colorado, USA, using the pixel nested plot design: Applied Soil Ecology, v. 35, no. 3, p. 622-634, https://doi.org/10.1016/j.apsoil.2006.09.009.","startPage":"622","endPage":"634","numberOfPages":"13","costCenters":[],"links":[{"id":241496,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213835,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.apsoil.2006.09.009"}],"volume":"35","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059edd3e4b0c8380cd49a25","contributors":{"authors":[{"text":"Kalkhan, M. A.","contributorId":82655,"corporation":false,"usgs":false,"family":"Kalkhan","given":"M.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":437806,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Stafford, E.J.","contributorId":11831,"corporation":false,"usgs":true,"family":"Stafford","given":"E.J.","email":"","affiliations":[],"preferred":false,"id":437804,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Woodly, P.J.","contributorId":35963,"corporation":false,"usgs":true,"family":"Woodly","given":"P.J.","email":"","affiliations":[],"preferred":false,"id":437805,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Stohlgren, T.J.","contributorId":7217,"corporation":false,"usgs":true,"family":"Stohlgren","given":"T.J.","email":"","affiliations":[],"preferred":false,"id":437803,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70035407,"text":"70035407 - 2007 - A ground penetrating radar investigation of a glacial-marine ice- contact delta, Pineo Ridge, eastern coastal Maine","interactions":[],"lastModifiedDate":"2012-03-12T17:21:55","indexId":"70035407","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3459,"text":"Special Paper of the Geological Society of America","active":true,"publicationSubtype":{"id":10}},"title":"A ground penetrating radar investigation of a glacial-marine ice- contact delta, Pineo Ridge, eastern coastal Maine","docAbstract":"In eastern coastal Maine, many flat-topped landforms, often identified as glacial-marine deltas, are cultivated for blueberry production. These agriculturally valuable features are not exploited for aggregate resources, severely limiting stratigraphic exposure. Coring is often forbidden; where permissible, coarse-grained surficial sediments make coring and sediment retrieval difficult. Ground penetrating radar (GPR) has become an invaluable tool in an ongoing study of the otherwise inaccessible subsurface morphology in this region and provides a means of detailing the large-scale sedimentary structures comprising these features. GPR studies allow us to reassess previous depositional interpretations and to develop alternative developmental models. The work presented here focuses on Pineo Ridge, a large, flat-topped ice-marginal glacial-marine delta complex with a strong linear trend and two distinct landform zones, informally termed East Pineo and West Pineo. Previous workers have described each zone separately due to local morphological variation. Our GPR work further substantiates this geomorphic differentiation. East Pineo developed as a series of deltaic lobes prograding southward from an ice-contact margin during the local marine highstand. GPR data do not suggest postdepositional modification by ice-margin re-advance. We suggest that West Pineo has a more complex, two-stage depositional history. The southern section of the feature consists of southward-prograding deltaic lobes deposited during retreat of the Laurentide ice margin, with later erosional modification during marine regression. The northern section of West Pineo formed as a series of northward-prograd- ing deltaic lobes as sediment-laden meltwater may have been diverted by the existing deposits of the southern section of West Pineo. ?? 2007 The Geological Society of America. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Special Paper of the Geological Society of America","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1130/2007.2432(06)","issn":"00721077","usgsCitation":"Tary, A., Duncan, M.F., and Weddle, T., 2007, A ground penetrating radar investigation of a glacial-marine ice- contact delta, Pineo Ridge, eastern coastal Maine: Special Paper of the Geological Society of America, no. 432, p. 77-91, https://doi.org/10.1130/2007.2432(06).","startPage":"77","endPage":"91","numberOfPages":"15","costCenters":[],"links":[{"id":215315,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1130/2007.2432(06)"},{"id":243110,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"issue":"432","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059e40de4b0c8380cd463a5","contributors":{"authors":[{"text":"Tary, A.K.","contributorId":11026,"corporation":false,"usgs":true,"family":"Tary","given":"A.K.","email":"","affiliations":[],"preferred":false,"id":450509,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Duncan, M. FitzGerald","contributorId":26900,"corporation":false,"usgs":true,"family":"Duncan","given":"M.","email":"","middleInitial":"FitzGerald","affiliations":[],"preferred":false,"id":450510,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Weddle, T.K.","contributorId":60002,"corporation":false,"usgs":true,"family":"Weddle","given":"T.K.","email":"","affiliations":[],"preferred":false,"id":450511,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70032762,"text":"70032762 - 2007 - Ovarian follicle dynamics of female Greater Scaup during egg production","interactions":[],"lastModifiedDate":"2018-05-13T12:33:26","indexId":"70032762","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2284,"text":"Journal of Field Ornithology","active":true,"publicationSubtype":{"id":10}},"title":"Ovarian follicle dynamics of female Greater Scaup during egg production","docAbstract":"<p><span>Studies of female waterfowl nutrient reserve use during egg production require a precise understanding of ovarian follicle dynamics to correctly interpret breeding status, and, therefore, derive proper inference. Concerns over numerical declines of North American scaup have increased the need to better understand the role of female condition in reproductive performance. We quantified ovarian follicle dynamics of female Greater Scaup (</span><i>Aythya marila</i><span>) breeding on the Yukon&ndash;Kuskokwim Delta, Alaska, using a method that accounts for within day variation in follicle size. We considered several models for describing changes in follicle growth with the best supported model estimating the duration of rapid follicle growth (RFG) to be 5.20 &plusmn; 0.52 days (&plusmn;95% confidence intervals) for each developing follicle. Average diameter and dry mass of preovulatory follicles were estimated to be 9.36 mm and 0.26 g, respectively, at the onset of RFG, and these follicle characteristics were 41.47 mm and 15.57 g, respectively, at ovulation. The average diameter of postovulatory follicles immediately following ovulation was estimated to be 17.35 mm, regressing quickly over several days. In addition, we derived predictive equations using diameter and dry mass to estimate the number of days before, and after, ovulation for pre- and postovulatory follicles, as well as an equation to estimate dry mass of damaged follicles. Our results allow precise definition of RFG and nest initiation dates, clutch size, and the daily energetic and nutritional demands of egg production at the individual level. This study provides the necessary foundation for additional work on Greater Scaup reproductive energetics and physiology, and offers an approach for quantifying ovarian follicle dynamics in other species.</span></p>","language":"English","publisher":"Wiley","doi":"10.1111/j.1557-9263.2006.00086.x","issn":"02738570","usgsCitation":"Gorman, K.B., Flint, P.L., Esler, D., and Williams, T., 2007, Ovarian follicle dynamics of female Greater Scaup during egg production: Journal of Field Ornithology, v. 78, no. 1, p. 64-73, https://doi.org/10.1111/j.1557-9263.2006.00086.x.","productDescription":"10 p.","startPage":"64","endPage":"73","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"links":[{"id":241495,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213834,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1111/j.1557-9263.2006.00086.x"}],"volume":"78","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a71cce4b0c8380cd76778","contributors":{"authors":[{"text":"Gorman, Kristen B.","contributorId":42437,"corporation":false,"usgs":true,"family":"Gorman","given":"Kristen","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":437800,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Flint, Paul L. 0000-0002-8758-6993 pflint@usgs.gov","orcid":"https://orcid.org/0000-0002-8758-6993","contributorId":3284,"corporation":false,"usgs":true,"family":"Flint","given":"Paul","email":"pflint@usgs.gov","middleInitial":"L.","affiliations":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true},{"id":117,"text":"Alaska Science Center Biology WTEB","active":true,"usgs":true}],"preferred":true,"id":437801,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Esler, Daniel 0000-0001-5501-4555 desler@usgs.gov","orcid":"https://orcid.org/0000-0001-5501-4555","contributorId":5465,"corporation":false,"usgs":true,"family":"Esler","given":"Daniel","email":"desler@usgs.gov","affiliations":[{"id":12437,"text":"Simon Fraser University, Centre for Wildlife Ecology","active":true,"usgs":false},{"id":114,"text":"Alaska Science Center","active":true,"usgs":true},{"id":116,"text":"Alaska Science Center Biology MFEB","active":true,"usgs":true}],"preferred":true,"id":437799,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Williams, T.D.","contributorId":53968,"corporation":false,"usgs":false,"family":"Williams","given":"T.D.","email":"","affiliations":[{"id":6953,"text":"Monterey Bay Aquarium","active":true,"usgs":false}],"preferred":false,"id":437802,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70031153,"text":"70031153 - 2007 - Has climatic warming altered spring flowering date of Sonoran Desert shrubs?","interactions":[],"lastModifiedDate":"2012-03-12T17:21:01","indexId":"70031153","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3451,"text":"Southwestern Naturalist","active":true,"publicationSubtype":{"id":10}},"title":"Has climatic warming altered spring flowering date of Sonoran Desert shrubs?","docAbstract":"With global warming, flowering at many locations has shifted toward earlier dates of bloom. A steady increase in average annual temperature since the late 1890s makes it likely that flowering also has advanced in the northern Sonoran Desert of the southwestern United States and northwestern Mexico. In this study, phenological models were used to predict annual date of spring bloom in the northern Sonoran Desert from 1894 to 2004; then, herbarium specimens were assessed for objective evidence of the predicted shift in flowering time. The phenological models were derived from known flowering requirements (triggers and heat sums) of Sonoran Desert shrubs. According to the models, flowering might have advanced by 20-41 d from 1894 to 2004. Analysis of herbarium specimens collected during the 20th century supported the model predictions. Over time, there was a significant increase in the proportion of shrub specimens collected in flower in March and a significant decrease in the proportion collected in May. Thus, the flowering curve - the proportion of individuals in flower in each spring month - shifted toward the start of the calendar year between 1900 and 1999. This shift could not be explained by collection activity: collectors showed no tendency to be active earlier in the year as time went on, nor did activity toward the end of spring decline in recent decades. Earlier bloom eventually could have substantial impacts on plant and animal communities in the Sonoran Desert, especially on migratory hummingbirds and population dynamics of shrubs.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Southwestern Naturalist","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1894/0038-4909(2007)52[347:HCWASF]2.0.CO;2","issn":"00384909","usgsCitation":"Bowers, J.E., 2007, Has climatic warming altered spring flowering date of Sonoran Desert shrubs?: Southwestern Naturalist, v. 52, no. 3, p. 347-355, https://doi.org/10.1894/0038-4909(2007)52[347:HCWASF]2.0.CO;2.","startPage":"347","endPage":"355","numberOfPages":"9","costCenters":[],"links":[{"id":239014,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":211676,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1894/0038-4909(2007)52[347:HCWASF]2.0.CO;2"}],"volume":"52","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a2f80e4b0c8380cd5ce3a","contributors":{"authors":[{"text":"Bowers, Janice E.","contributorId":18119,"corporation":false,"usgs":true,"family":"Bowers","given":"Janice","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":430275,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}}
,{"id":70035411,"text":"70035411 - 2007 - Origin and emplacement of impactites in the Chesapeake Bay impact structure, Virginia, USA","interactions":[],"lastModifiedDate":"2020-03-27T06:44:51","indexId":"70035411","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3459,"text":"Special Paper of the Geological Society of America","active":true,"publicationSubtype":{"id":10}},"title":"Origin and emplacement of impactites in the Chesapeake Bay impact structure, Virginia, USA","docAbstract":"<div class=\"book-chapter-body\"><div id=\"ContentTab\" class=\"content active\"><div class=\"widget widget-BookSectionsText widget-instance-BookChaptertext\"><div class=\"module-widget\"><div class=\"widget-items\" data-widgetname=\"BookSectionsText\"><div class=\"category-section clearfix content-section \"><p>The late Eocene Chesapeake Bay impact structure, located on the Atlantic margin of Virginia, may be Earth's best-preserved large impact structure formed in a shallow marine, siliciclastic, continental-shelf environment. It has the form of an inverted sombrero in which a central crater ∼40 km in diameter is surrounded by a shallower brim, the annular trough, that extends the diameter to ∼85 km. The annular trough is interpreted to have formed largely by the collapse and mobilization of weak sediments. Crystalline-clast suevite, found only in the central crater, contains clasts and blocks of shocked gneiss that likely were derived from the fragmentation of the central-uplift basement. The suevite and entrained megablocks are interpreted to have formed from impact-melt particles and crystalline-rock debris that never left the central crater, rather than as a fallback deposit. Impact-modified sediments in the annular trough include megablocks of Cretaceous nonmarine sediment disrupted by faults, fluidized sands, fractured clays, and mixed-sediment intercalations. These impact-modified sediments could have formed by a combination of processes, including ejection into and mixing of sediments in the water column, rarefaction-induced fragmentation and clastic injection, liquefaction and fluidization of sand in response to acousticwave vibrations, gravitational collapse, and inward lateral spreading. The Exmore beds, which blanket the entire crater and nearby areas, consist of a lower diamicton member overlain by an upper stratified member. They are interpreted as unstratified ocean-resurge deposits, having depositional cycles that may represent stages of inward resurge or outward anti-resurge flow, overlain by stratified fallout of suspended sediment from the water column.</p></div></div></div></div></div></div>","language":"English","publisher":"Geological Society of America","doi":"10.1130/2008.2437(06)","issn":"00721077","usgsCitation":"Horton,, J., Gohn, G., Powars, D.S., and Edwards, L.E., 2007, Origin and emplacement of impactites in the Chesapeake Bay impact structure, Virginia, USA: Special Paper of the Geological Society of America, no. 437, p. 73-97, https://doi.org/10.1130/2008.2437(06).","productDescription":"25 p.","startPage":"73","endPage":"97","numberOfPages":"25","costCenters":[{"id":243,"text":"Eastern Geology and Paleoclimate Science Center","active":true,"usgs":true},{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true}],"links":[{"id":243112,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Chesapeake Bay","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -77.54150390625,\n              36.73888412439431\n            ],\n            [\n              -75.157470703125,\n              36.73888412439431\n            ],\n            [\n              -75.157470703125,\n              39.70718665682654\n            ],\n            [\n              -77.54150390625,\n              39.70718665682654\n            ],\n            [\n              -77.54150390625,\n              36.73888412439431\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","issue":"437","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a70a4e4b0c8380cd76159","contributors":{"authors":[{"text":"Horton,, J. Wright Jr. 0000-0001-6756-6365","orcid":"https://orcid.org/0000-0001-6756-6365","contributorId":219824,"corporation":false,"usgs":true,"family":"Horton,","given":"J. Wright","suffix":"Jr.","affiliations":[{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true}],"preferred":true,"id":450538,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Gohn, Gregory 0000-0003-2000-479X ggohn@usgs.gov","orcid":"https://orcid.org/0000-0003-2000-479X","contributorId":219822,"corporation":false,"usgs":true,"family":"Gohn","given":"Gregory","email":"ggohn@usgs.gov","affiliations":[{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true},{"id":243,"text":"Eastern Geology and Paleoclimate Science Center","active":true,"usgs":true}],"preferred":true,"id":450537,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Powars, David S. 0000-0002-6787-8964 dspowars@usgs.gov","orcid":"https://orcid.org/0000-0002-6787-8964","contributorId":1181,"corporation":false,"usgs":true,"family":"Powars","given":"David","email":"dspowars@usgs.gov","middleInitial":"S.","affiliations":[{"id":243,"text":"Eastern Geology and Paleoclimate Science Center","active":true,"usgs":true},{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true}],"preferred":true,"id":450536,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Edwards, Lucy E. 0000-0003-4075-3317 leedward@usgs.gov","orcid":"https://orcid.org/0000-0003-4075-3317","contributorId":2647,"corporation":false,"usgs":true,"family":"Edwards","given":"Lucy","email":"leedward@usgs.gov","middleInitial":"E.","affiliations":[{"id":40020,"text":"Florence Bascom Geoscience Center","active":true,"usgs":true},{"id":243,"text":"Eastern Geology and Paleoclimate Science Center","active":true,"usgs":true}],"preferred":true,"id":450535,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70032732,"text":"70032732 - 2007 - Constraining 17O and 27Al NMR spectra of high-pressure crystals and glasses: New data for jadeite, pyrope, grossular, and mullite","interactions":[],"lastModifiedDate":"2012-03-12T17:21:23","indexId":"70032732","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":738,"text":"American Mineralogist","active":true,"publicationSubtype":{"id":10}},"title":"Constraining 17O and 27Al NMR spectra of high-pressure crystals and glasses: New data for jadeite, pyrope, grossular, and mullite","docAbstract":"The 17O NMR spectra of glasses quenched from melts at high pressure are often difficult to interpret due to overlapping peaks and lack of crystalline model compounds. High-pressure aluminosilicate glasses often contain significant amounts of [5]Al and [6]Al, thus these high-pressure glasses must contain oxygen bonded to high-coordinated aluminum. The 17O NMR parameters for the minerals jadeite, pyrope, grossular, and mullite are presented to assist interpretation of glass spectra and to help test quantum chemical calculations. The 17O NMR parameters for jadeite and grossular support previous peak assignments of oxygen bonded to Si and high-coordinated Al in high-pressure glasses as well as quantum chemical calculations. The oxygen tricluster in mullite is very similar to the previously observed tricluster in grossite (CaAl4 O7) and suspected triclusters in glasses. We also present 27Al NMR spectra for pyrope, grossular, and mullite.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"American Mineralogist","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.2138/am.2007.2284","issn":"0003004X","usgsCitation":"Kelsey, K., Stebbins, J., Du, L., and Hankins, B., 2007, Constraining 17O and 27Al NMR spectra of high-pressure crystals and glasses: New data for jadeite, pyrope, grossular, and mullite: American Mineralogist, v. 92, no. 1, p. 210-216, https://doi.org/10.2138/am.2007.2284.","startPage":"210","endPage":"216","numberOfPages":"7","costCenters":[],"links":[{"id":213926,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.2138/am.2007.2284"},{"id":241600,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"92","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059fa07e4b0c8380cd4d8aa","contributors":{"authors":[{"text":"Kelsey, K.E.","contributorId":71010,"corporation":false,"usgs":true,"family":"Kelsey","given":"K.E.","email":"","affiliations":[],"preferred":false,"id":437666,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Stebbins, J.F.","contributorId":58851,"corporation":false,"usgs":true,"family":"Stebbins","given":"J.F.","email":"","affiliations":[],"preferred":false,"id":437665,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Du, L.-S.","contributorId":71396,"corporation":false,"usgs":true,"family":"Du","given":"L.-S.","email":"","affiliations":[],"preferred":false,"id":437667,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Hankins, B.","contributorId":90945,"corporation":false,"usgs":true,"family":"Hankins","given":"B.","email":"","affiliations":[],"preferred":false,"id":437668,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70032731,"text":"70032731 - 2007 - Subaqueous geology and a filling model for Crater Lake, Oregon","interactions":[],"lastModifiedDate":"2019-03-04T11:45:52","indexId":"70032731","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1919,"text":"Hydrobiologia","onlineIssn":"1573-5117","printIssn":"0018-8158","active":true,"publicationSubtype":{"id":10}},"title":"Subaqueous geology and a filling model for Crater Lake, Oregon","docAbstract":"<p>Results of a detailed bathymetric survey of Crater Lake conducted in 2000, combined with previous results of submersible and dredge sampling, form the basis for a geologic map of the lake floor and a model for the filling of Crater Lake with water. The most prominent landforms beneath the surface of Crater Lake are andesite volcanoes that were active as the lake was filling with water, following caldera collapse during the climactic eruption of Mount Mazama 7700 cal. yr B.P. The Wizard Island volcano is the largest and probably was active longest, ceasing eruptions when the lake was 80 m lower than present. East of Wizard Island is the central platform volcano and related lava flow fields on the caldera floor. Merriam Cone is a symmetrical andesitic volcano that apparently was constructed subaqueously during the same period as the Wizard Island and central platform volcanoes. The youngest postcaldera volcanic feature is a small rhyodacite dome on the east flank of the Wizard Island edifice that dates from 4800 cal. yr B.P. The bathymetry also yields information on bedrock outcrops and talus/debris slopes of the caldera walls. Gravity flows transport sediment from wall sources to the deep basins of the lake. Several debris-avalanche deposits, containing blocks up to 280 m long, are present on the caldera floor and occur below major embayments in the caldera walls. Geothermal phenomena on the lake floor are bacterial mats, pools of solute-rich warm water, and fossil subaqueous hot spring deposits. Lake level is maintained by a balance between precipitation and inflow versus evaporation and leakage. High-resolution bathymetry reveals a series of up to nine drowned beaches in the upper 30 m of the lake that we propose reflect stillstands subsequent to filling of Crater Lake. A prominent wave-cut platform between 4 m depth and present lake level that commonly is up to 40 m wide suggests that the surface of Crater Lake has been at this elevation for a very long time. Lake level apparently is limited by leakage through a permeable layer in the northeast caldera wall. The deepest drowned beach approximately corresponds to the base of the permeable layer. Among a group of lake filling models, our preferred one is constrained by the drowned beaches, the permeable layer in the caldera wall, and paleoclimatic data. We used a precipitation rate 70% of modern as a limiting case. Satisfactory models require leakage to be proportional to elevation and the best fit model has a linear combination of 45% leakage proportional to elevation and 55% of leakage proportional to elevation above the base of the permeable layer. At modern precipitation rates, the lake would have taken 420 yr to fill, or a maximum of 740 yr if precipitation was 70% of the modern value. The filling model provides a chronology for prehistoric passage zones on postcaldera volcanoes that ceased erupting before the lake was filled.</p>","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Hydrobiologia","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s10750-006-0343-5","issn":"00188158","usgsCitation":"Nathenson, M., Bacon, C., and Ramsey, D., 2007, Subaqueous geology and a filling model for Crater Lake, Oregon: Hydrobiologia, v. 574, no. 1, p. 13-27, https://doi.org/10.1007/s10750-006-0343-5.","productDescription":"15 p.","startPage":"13","endPage":"27","numberOfPages":"15","costCenters":[{"id":615,"text":"Volcano Hazards Program","active":true,"usgs":true},{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"links":[{"id":477074,"rank":10000,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://zenodo.org/record/1232804","text":"External Repository"},{"id":241599,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213925,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s10750-006-0343-5"}],"volume":"574","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b9cffe4b08c986b31d59f","contributors":{"authors":[{"text":"Nathenson, M.","contributorId":46632,"corporation":false,"usgs":true,"family":"Nathenson","given":"M.","email":"","affiliations":[],"preferred":false,"id":437663,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bacon, C. R. 0000-0002-2165-5618","orcid":"https://orcid.org/0000-0002-2165-5618","contributorId":21522,"corporation":false,"usgs":true,"family":"Bacon","given":"C. R.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":false,"id":437662,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Ramsey, D.W.","contributorId":95219,"corporation":false,"usgs":true,"family":"Ramsey","given":"D.W.","email":"","affiliations":[],"preferred":false,"id":437664,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}}
,{"id":70032729,"text":"70032729 - 2007 - Heat transport in the Red Lake Bog, Glacial Lake Agassiz Peatlands","interactions":[],"lastModifiedDate":"2018-10-17T09:12:48","indexId":"70032729","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1924,"text":"Hydrological Processes","active":true,"publicationSubtype":{"id":10}},"title":"Heat transport in the Red Lake Bog, Glacial Lake Agassiz Peatlands","docAbstract":"<p><span>We report the results of an investigation on the processes controlling heat transport in peat under a large bog in the Glacial Lake Agassiz Peatlands. For 2 years, starting in July 1998, we recorded temperature at 12 depth intervals from 0 to 400 cm within a vertical peat profile at the crest of the bog at sub‐daily intervals. We also recorded air temperature 1 m above the peat surface. We calculate a peat thermal conductivity of 0·5 W m</span><sup>−1</sup><span>&nbsp;°C</span><sup>−1</sup><span>&nbsp;and model vertical heat transport through the peat using the SUTRA model. The model was calibrated to the first year of data, and then evaluated against the second year of collected heat data. The model results suggest that advective pore‐water flow is not necessary to transport heat within the peat profile and most of the heat is transferred by thermal conduction alone in these waterlogged soils. In the spring season, a zero‐curtain effect controls the transport of heat through shallow depths of the peat. Changes in local climate and the resulting changes in thermal transport still may cause non‐linear feedbacks in methane emissions related to the generation of methane deeper within the peat profile as regional temperatures increase.</span></p>","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Hydrological Processes","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","publisher":"John Wiley & Sons, Ltd. ","doi":"10.1002/hyp.6239","issn":"08856087","usgsCitation":"McKenzie, J., Siegel, D.I., Rosenberry, D.O., Glaser, P., and Voss, C.I., 2007, Heat transport in the Red Lake Bog, Glacial Lake Agassiz Peatlands: Hydrological Processes, v. 21, no. 3, p. 369-378, https://doi.org/10.1002/hyp.6239.","productDescription":"10 p.","startPage":"369","endPage":"378","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":213865,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1002/hyp.6239"},{"id":241530,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Minnesota","otherGeospatial":"Glacial Lake Agassiz Peatlands","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -95.6667,\n              48.065232067568\n            ],\n            [\n              -95.6667,\n              48.73083222613515\n            ],\n            [\n              -93.8232421875,\n              48.73083222613515\n            ],\n            [\n              -93.8232421875,\n              48.065232067568\n            ],\n            [\n              -95.6667,\n              48.065232067568\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","volume":"21","issue":"3","noUsgsAuthors":false,"publicationDate":"2006-12-21","publicationStatus":"PW","scienceBaseUri":"505a3006e4b0c8380cd5d2e7","contributors":{"authors":[{"text":"McKenzie, J.M.","contributorId":75759,"corporation":false,"usgs":true,"family":"McKenzie","given":"J.M.","email":"","affiliations":[],"preferred":false,"id":437658,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Siegel, D. I.","contributorId":77562,"corporation":false,"usgs":true,"family":"Siegel","given":"D.","email":"","middleInitial":"I.","affiliations":[],"preferred":false,"id":437659,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Rosenberry, Donald O. 0000-0003-0681-5641 rosenber@usgs.gov","orcid":"https://orcid.org/0000-0003-0681-5641","contributorId":1312,"corporation":false,"usgs":true,"family":"Rosenberry","given":"Donald","email":"rosenber@usgs.gov","middleInitial":"O.","affiliations":[{"id":5044,"text":"National Research Program - Central Branch","active":true,"usgs":true},{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":437657,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Glaser, P.H.","contributorId":13791,"corporation":false,"usgs":true,"family":"Glaser","given":"P.H.","email":"","affiliations":[],"preferred":false,"id":437656,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Voss, Clifford I. 0000-0001-5923-2752 cvoss@usgs.gov","orcid":"https://orcid.org/0000-0001-5923-2752","contributorId":1559,"corporation":false,"usgs":true,"family":"Voss","given":"Clifford","email":"cvoss@usgs.gov","middleInitial":"I.","affiliations":[{"id":438,"text":"National Research Program - Western Branch","active":true,"usgs":true}],"preferred":true,"id":437660,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70032728,"text":"70032728 - 2007 - Waveform inversion of volcano-seismic signals for an extended source","interactions":[],"lastModifiedDate":"2023-10-04T11:06:02.104249","indexId":"70032728","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2314,"text":"Journal of Geophysical Research B: Solid Earth","active":true,"publicationSubtype":{"id":10}},"title":"Waveform inversion of volcano-seismic signals for an extended source","docAbstract":"<div class=\" metis-abstract\"><div class=\"article-section__content en main\"><p><span class=\"paraNumber\">[1]<span>&nbsp;</span></span>We propose a method to investigate the dimensions and oscillation characteristics of the source of volcano-seismic signals based on waveform inversion for an extended source. An extended source is realized by a set of point sources distributed on a grid surrounding the centroid of the source in accordance with the source geometry and orientation. The source-time functions for all point sources are estimated simultaneously by waveform inversion carried out in the frequency domain. We apply a smoothing constraint to suppress short-scale noisy fluctuations of source-time functions between adjacent sources. The strength of the smoothing constraint we select is that which minimizes the Akaike Bayesian Information Criterion (ABIC). We perform a series of numerical tests to investigate the capability of our method to recover the dimensions of the source and reconstruct its oscillation characteristics. First, we use synthesized waveforms radiated by a kinematic source model that mimics the radiation from an oscillating crack. Our results demonstrate almost complete recovery of the input source dimensions and source-time function of each point source, but also point to a weaker resolution of the higher modes of crack oscillation. Second, we use synthetic waveforms generated by the acoustic resonance of a fluid-filled crack, and consider two sets of waveforms dominated by the modes with wavelengths 2<i>L</i>/3 and 2<i>W</i>/3, or<span>&nbsp;</span><i>L</i><span>&nbsp;</span>and 2<i>L</i>/5, where<span>&nbsp;</span><i>W</i><span>&nbsp;</span>and<span>&nbsp;</span><i>L</i><span>&nbsp;</span>are the crack width and length, respectively. Results from these tests indicate that the oscillating signature of the 2<i>L</i>/3 and 2<i>W</i>/3 modes are successfully reconstructed. The oscillating signature of the<span>&nbsp;</span><i>L</i><span>&nbsp;</span>mode is also well recovered, in contrast to results obtained for a point source for which the moment tensor description is inadequate. However, the oscillating signature of the 2<i>L</i>/5 mode is poorly recovered owing to weaker resolution of short-scale crack wall motions. The triggering excitations of the oscillating cracks are successfully reconstructed.</p></div></div>","language":"English","publisher":"American Geophysical Union","doi":"10.1029/2006JB004490","issn":"01480227","usgsCitation":"Nakano, M., Kumagai, H., Chouet, B., and Dawson, P., 2007, Waveform inversion of volcano-seismic signals for an extended source: Journal of Geophysical Research B: Solid Earth, v. 112, no. 2, B02306, 21 p., https://doi.org/10.1029/2006JB004490.","productDescription":"B02306, 21 p.","costCenters":[{"id":615,"text":"Volcano Hazards Program","active":true,"usgs":true}],"links":[{"id":241529,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"112","issue":"2","noUsgsAuthors":false,"publicationDate":"2007-02-27","publicationStatus":"PW","scienceBaseUri":"505bcfa0e4b08c986b32e9f4","contributors":{"authors":[{"text":"Nakano, M.","contributorId":43528,"corporation":false,"usgs":false,"family":"Nakano","given":"M.","email":"","affiliations":[],"preferred":false,"id":437652,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Kumagai, Hiroyuki","contributorId":71337,"corporation":false,"usgs":false,"family":"Kumagai","given":"Hiroyuki","email":"","affiliations":[],"preferred":false,"id":437655,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Chouet, B.","contributorId":68465,"corporation":false,"usgs":true,"family":"Chouet","given":"B.","affiliations":[],"preferred":false,"id":437654,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Dawson, P. 0000-0003-4065-0588","orcid":"https://orcid.org/0000-0003-4065-0588","contributorId":49529,"corporation":false,"usgs":true,"family":"Dawson","given":"P.","affiliations":[],"preferred":false,"id":437653,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70032727,"text":"70032727 - 2007 - Hydrologic response of the Crow Wing Watershed, Minnesota, to mid-Holocene climate change","interactions":[],"lastModifiedDate":"2012-03-12T17:21:24","indexId":"70032727","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1786,"text":"Geological Society of America Bulletin","active":true,"publicationSubtype":{"id":10}},"title":"Hydrologic response of the Crow Wing Watershed, Minnesota, to mid-Holocene climate change","docAbstract":"In this study, we have integrated a suite of Holocene paleoclimatic proxies with mathematical modeling in an attempt to obtain a comprehensive picture of how watersheds respond to past climate change. A three-dimensional surface-water-groundwater model was developed to assess the effects of mid-Holocene climate change on water resources within the Crow Wing Watershed, Upper Mississippi Basin in north central Minnesota. The model was first calibrated to a 50 yr historical record of average annual surface-water discharge, monthly groundwater levels, and lake-level fluctuations. The model was able to reproduce reasonably well long-term historical records (1949-1999) of water-table and lake-level fluctuations across the watershed as well as stream discharge near the watershed outlet. The calibrated model was then used to reproduce paleogroundwater and lake levels using climate reconstructions based on pollen-transfer functions from Williams Lake just outside the watershed. Computed declines in mid-Holocene lake levels for two lakes at opposite ends of the watershed were between 6 and 18 m. Simulated streamflow near the outlet of the watershed decreased to 70% of modern average annual discharge after ???200 yr. The area covered by wetlands for the entire watershed was reduced by ???16%. The mid-Holocene hydrologic changes indicated by these model results and corroborated by several lake-core records across the Crow Wing Watershed may serve as a useful proxy of the hydrologic response to future warm, dry climatic forecasts (ca. 2050) made by some atmospheric general-circulation models for the glaciated Midwestern United States. ?? 2007 Geological Society of America.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Geological Society of America Bulletin","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1130/B26003.1","issn":"00167606","usgsCitation":"Person, M., Roy, P., Wright, H., Gutowski, W., Ito, E., Winter, T., Rosenberry, D., and Cohen, D., 2007, Hydrologic response of the Crow Wing Watershed, Minnesota, to mid-Holocene climate change: Geological Society of America Bulletin, v. 119, no. 3-4, p. 363-376, https://doi.org/10.1130/B26003.1.","startPage":"363","endPage":"376","numberOfPages":"14","costCenters":[],"links":[{"id":477108,"rank":10000,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://lib.dr.iastate.edu/ge_at_pubs/95","text":"External Repository"},{"id":241494,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":213833,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1130/B26003.1"}],"volume":"119","issue":"3-4","noUsgsAuthors":false,"publicationDate":"2007-03-15","publicationStatus":"PW","scienceBaseUri":"505a3686e4b0c8380cd607a0","contributors":{"authors":[{"text":"Person, M.","contributorId":20876,"corporation":false,"usgs":true,"family":"Person","given":"M.","email":"","affiliations":[],"preferred":false,"id":437645,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Roy, P.","contributorId":107109,"corporation":false,"usgs":true,"family":"Roy","given":"P.","email":"","affiliations":[],"preferred":false,"id":437650,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Wright, H.","contributorId":7083,"corporation":false,"usgs":true,"family":"Wright","given":"H.","email":"","affiliations":[],"preferred":false,"id":437644,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Gutowski, W. Jr.","contributorId":58850,"corporation":false,"usgs":true,"family":"Gutowski","given":"W.","suffix":"Jr.","affiliations":[],"preferred":false,"id":437648,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Ito, E.","contributorId":24956,"corporation":false,"usgs":true,"family":"Ito","given":"E.","email":"","affiliations":[],"preferred":false,"id":437646,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Winter, T.","contributorId":89333,"corporation":false,"usgs":true,"family":"Winter","given":"T.","affiliations":[],"preferred":false,"id":437649,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Rosenberry, D.","contributorId":39338,"corporation":false,"usgs":true,"family":"Rosenberry","given":"D.","email":"","affiliations":[],"preferred":false,"id":437647,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Cohen, D.","contributorId":108299,"corporation":false,"usgs":true,"family":"Cohen","given":"D.","email":"","affiliations":[],"preferred":false,"id":437651,"contributorType":{"id":1,"text":"Authors"},"rank":8}]}}
,{"id":70032560,"text":"70032560 - 2007 - Brown-headed cowbird, Molothrus ater, parasitism and abundance in the northern Great Plains","interactions":[],"lastModifiedDate":"2021-05-20T17:44:36.400836","indexId":"70032560","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1163,"text":"Canadian Field-Naturalist","active":true,"publicationSubtype":{"id":10}},"displayTitle":"Brown-headed Cowbird, <i>Molothrus ater</i>, Parasitism and Abundance in the Northern Great Plains","title":"Brown-headed cowbird, Molothrus ater, parasitism and abundance in the northern Great Plains","docAbstract":"<p><span>The Brown-headed Cowbird (</span><i>Molothrus ater</i><span>) reaches its highest abundance in the northern Great Plains, but much of our understanding of cowbird ecology and host-parasite interactions comes from areas outside of this region. We examine cowbird brood parasitism and densities during two studies of breeding birds in the northern Great Plains during 1990–2006. We found 2649 active nests of 75 species, including 746 nonpasserine nests and 1902 passerine nests. Overall, &lt;1% of nonpasserine nests and 25% of passerine nests were parasitized by Brown-headed Cowbirds. Although the overall frequency of cowbird parasitism in passerine nests in these two studies is considered moderate, the frequency of multiple parasitism among parasitized nests was heavy (nearly 50%). The mean number of cowbird eggs per parasitized passerine nest was 1.9 ± 1.2 (SD; range = 1–8 cowbird eggs). The parasitism rates were 9.5% for passerines that typically nest in habitats characterized by woody vegetation, 16.4% for grassland-nesting passerines, 4.7% for passerines known to consistently eject cowbird eggs, and 28.2% for passerines that usually accept cowbird eggs. The Red-winged Blackbird (</span><i>Agelaius phoeniceus</i><span>) was the most commonly parasitized species (43.1% parasitism, 49.6% multiple parasitism, 71.2% of all cases of parasitism). Passerine nests found within areas of higher female cowbird abundance experienced higher frequencies of cowbird parasitism than those found in areas of lower female cowbird abundance. Densities of female cowbirds were positively related to densities and richness of other birds in the breeding bird community.</span></p>","language":"English","publisher":"PKP Publishing Services Network","doi":"10.22621/cfn.v121i3.471","issn":"00083","usgsCitation":"Igl, L., and Johnson, D.H., 2007, Brown-headed cowbird, Molothrus ater, parasitism and abundance in the northern Great Plains: Canadian Field-Naturalist, v. 121, no. 3, p. 239-255, https://doi.org/10.22621/cfn.v121i3.471.","productDescription":"17 p.","startPage":"239","endPage":"255","costCenters":[{"id":480,"text":"Northern Prairie Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":487078,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.22621/cfn.v121i3.471","text":"Publisher Index Page"},{"id":241519,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Minnesota, Montana, North Dakota, South Dakota","otherGeospatial":"Great Northern Plains","geographicExtents":"{\n  \"type\": \"FeatureCollection\",\n  \"features\": [\n    {\n      \"type\": \"Feature\",\n      \"properties\": {},\n      \"geometry\": {\n        \"type\": \"Polygon\",\n        \"coordinates\": [\n          [\n            [\n              -105.8203125,\n              44.653024159812\n            ],\n            [\n              -96.1083984375,\n              44.653024159812\n            ],\n            [\n              -96.1083984375,\n              49.06666839558117\n            ],\n            [\n              -105.8203125,\n              49.06666839558117\n            ],\n            [\n              -105.8203125,\n              44.653024159812\n            ]\n          ]\n        ]\n      }\n    }\n  ]\n}","volume":"121","issue":"3","noUsgsAuthors":false,"publicationDate":"2007-07-01","publicationStatus":"PW","scienceBaseUri":"5059f28fe4b0c8380cd4b252","contributors":{"authors":[{"text":"Igl, L.D. 0000-0003-0530-7266","orcid":"https://orcid.org/0000-0003-0530-7266","contributorId":13568,"corporation":false,"usgs":true,"family":"Igl","given":"L.D.","affiliations":[],"preferred":false,"id":436815,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Johnson, Douglas H. 0000-0002-7778-6641","orcid":"https://orcid.org/0000-0002-7778-6641","contributorId":70327,"corporation":false,"usgs":true,"family":"Johnson","given":"Douglas","email":"","middleInitial":"H.","affiliations":[],"preferred":false,"id":436816,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}}
,{"id":70032213,"text":"70032213 - 2007 - Comparative lahar hazard mapping at Volcan Citlaltépetl, Mexico using SRTM, ASTER and DTED-1 digital topographic data","interactions":[],"lastModifiedDate":"2015-04-13T09:38:33","indexId":"70032213","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2499,"text":"Journal of Volcanology and Geothermal Research","active":true,"publicationSubtype":{"id":10}},"title":"Comparative lahar hazard mapping at Volcan Citlaltépetl, Mexico using SRTM, ASTER and DTED-1 digital topographic data","docAbstract":"<p id=\"\">In this study, we evaluated and compared the utility of spaceborne SRTM and ASTER DEMs with baseline DTED-1 &ldquo;bald-earth&rdquo; topography for mapping lahar inundation hazards from volcan Citlalt&eacute;petl, Mexico, a volcano which has had a history of producing debris flows of various extents. In particular, we tested the utility of these topographic datasets for resolving ancient valley-filling deposits exposed around the flanks of the volcano, for determining their magnitude using paleohydrologic methods and for forecasting their inundation limits in the future. We also use the three datasets as inputs to a GIS stream inundation flow model, LAHARZ, and compare the results.</p>\n<p id=\"\">In general all three datasets, with spatial resolution of 90&nbsp;m or better, were capable of resolving debris flow and lahar deposits at least 3&nbsp;&times;&nbsp;10<sup>6</sup>&nbsp;m<sup>3</sup>&nbsp;in volume or larger. Canopy- and slope-related height errors in the ASTER and SRTM DEMs limit their utility for measuring valley-filling cross-sectional area and deriving flow magnitude for the smallest deposits using a cross-sectional area to volume scaling equation. Height errors in the ASTER and SRTM DEMs also causes problems in resolving stream valley hydrography which controls lahar flow paths and stream valley morphology which controls lahar filling capacity. However, both of the two spaceborne DEM datasets are better than DTED-1 at resolving fine details in stream hydrography and erosional morphologies of volcaniclastics preserved in the valleys around the more humid, eastern flanks of the volcanic range.</p>\n<p id=\"\">The results of LAHARZ flow inundation modeling using all three DEMs as inputs are remarkably similar and co-validate one another. For example, at Citlalt&eacute;petl all lahar simulations show that the city of Orizaba is the most vulnerable to flows similar in magnitude to, or larger than, one that occurred in 1920. Many of the other cities and towns illustrated are built higher up on terrace deposits of older debris flows, and are safe from all but the largest flows, which occur less frequently.</p>\n<p id=\"\">Finally, ASTERs 60&nbsp;km swath width and 8% duty cycle presents a challenge for mapping lahar inundation hazards at E&ndash;W oriented stream valleys in low-latitude areas with persistent cloud cover. However, its continued operations enhances its utility as a means for updating the continuous but one-time coverage of SRTM, and for filling voids in the SRTM dataset such as those that occur along steep-sided valleys prone to hazards from future lahars.</p>","language":"English","publisher":"Elsevier","doi":"10.1016/j.jvolgeores.2006.09.005","issn":"03770273","usgsCitation":"Hubbard, B.E., Sheridan, M.F., Carrasco-Nunez, G., Diaz-Castellon, R., and Rodriguez, S.R., 2007, Comparative lahar hazard mapping at Volcan Citlaltépetl, Mexico using SRTM, ASTER and DTED-1 digital topographic data: Journal of Volcanology and Geothermal Research, v. 160, no. 1-2, p. 99-124, https://doi.org/10.1016/j.jvolgeores.2006.09.005.","productDescription":"26 p.","startPage":"99","endPage":"124","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[],"links":[{"id":242370,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":214628,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.jvolgeores.2006.09.005"}],"volume":"160","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059f81ee4b0c8380cd4cebb","contributors":{"authors":[{"text":"Hubbard, Bernard E. 0000-0002-9315-2032 bhubbard@usgs.gov","orcid":"https://orcid.org/0000-0002-9315-2032","contributorId":2342,"corporation":false,"usgs":true,"family":"Hubbard","given":"Bernard","email":"bhubbard@usgs.gov","middleInitial":"E.","affiliations":[{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":435064,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Sheridan, Michael F.","contributorId":59413,"corporation":false,"usgs":true,"family":"Sheridan","given":"Michael","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":435061,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Carrasco-Nunez, Gerardo","contributorId":44714,"corporation":false,"usgs":true,"family":"Carrasco-Nunez","given":"Gerardo","email":"","affiliations":[],"preferred":false,"id":435063,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Diaz-Castellon, Rodolfo","contributorId":37936,"corporation":false,"usgs":true,"family":"Diaz-Castellon","given":"Rodolfo","email":"","affiliations":[],"preferred":false,"id":435062,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Rodriguez, Sergio R.","contributorId":35529,"corporation":false,"usgs":true,"family":"Rodriguez","given":"Sergio","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":435060,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70032183,"text":"70032183 - 2007 - Plio-Pleistocene climatic transition and the lifting of the Teton Range, Wyoming","interactions":[],"lastModifiedDate":"2012-03-12T17:21:25","indexId":"70032183","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3218,"text":"Quaternary Research","active":true,"publicationSubtype":{"id":10}},"title":"Plio-Pleistocene climatic transition and the lifting of the Teton Range, Wyoming","docAbstract":"Fine-grained lacustrine, riverine and ash-fall sediments of the Shooting Iron Formation, whose late Pliocene age is established by Blancan gastropods and vertebrates, yield a pollen flora that is essentially similar in composition to the modern pollen rain in the Jackson Hole area. The Pliocene assemblage suggests a climate like that of the Jackson valley and foothills today. These spectra also resemble a Pliocene pollen flora from Yellowstone Park dated at ??? 2.02??Ma. However, the underlying Miocene Teewinot sediments differ by containing pollen of four exotic deciduous hardwoods (Tertiary relicts) that suggest a summer-moist climate, unlike that of today. The Shooting Iron sediments lie with an angular unconformity on and above the Miocene lake sediments of the Teewinot Formation. Both of these deposits probably preceded the main uplift of the Teton Range based on the absence of Precambrian clasts in the Tertiary valley deposits. Because the Pliocene floras were modern in aspect, a Plio-Pleistocene transition would be floristically imperceptible here. The sequence denotes a protracted period of relative stability of climate during Teewinot time, and a shift in vegetational state (summer-wet trees drop out) sometime between the latest Miocene and latest Pliocene. The Pliocene spectra suggest a dry, cooler climate toward the end of Shooting Iron time. ?? 2006 University of Washington.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Quaternary Research","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.yqres.2006.10.006","issn":"00335894","usgsCitation":"Leopold, E.B., Liu, G., Love, J.D., and Love, D., 2007, Plio-Pleistocene climatic transition and the lifting of the Teton Range, Wyoming: Quaternary Research, v. 67, no. 1, p. 1-11, https://doi.org/10.1016/j.yqres.2006.10.006.","startPage":"1","endPage":"11","numberOfPages":"11","costCenters":[],"links":[{"id":242405,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":214661,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.yqres.2006.10.006"}],"volume":"67","issue":"1","noUsgsAuthors":false,"publicationDate":"2017-01-20","publicationStatus":"PW","scienceBaseUri":"505a7c5be4b0c8380cd7993c","contributors":{"authors":[{"text":"Leopold, E. B.","contributorId":81162,"corporation":false,"usgs":true,"family":"Leopold","given":"E.","email":"","middleInitial":"B.","affiliations":[],"preferred":false,"id":434914,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Liu, Gaisheng","contributorId":15158,"corporation":false,"usgs":true,"family":"Liu","given":"Gaisheng","email":"","affiliations":[],"preferred":false,"id":434911,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Love, J. D.","contributorId":64620,"corporation":false,"usgs":true,"family":"Love","given":"J.","middleInitial":"D.","affiliations":[],"preferred":false,"id":434913,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Love, D.W.","contributorId":52176,"corporation":false,"usgs":true,"family":"Love","given":"D.W.","email":"","affiliations":[],"preferred":false,"id":434912,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70032178,"text":"70032178 - 2007 - S-33 constraints on the seawater sulfate contribution in modern seafloor hydrothermal vent sulfides","interactions":[],"lastModifiedDate":"2012-03-12T17:21:25","indexId":"70032178","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1759,"text":"Geochimica et Cosmochimica Acta","active":true,"publicationSubtype":{"id":10}},"title":"S-33 constraints on the seawater sulfate contribution in modern seafloor hydrothermal vent sulfides","docAbstract":"Sulfide sulfur in mid-oceanic ridge hydrothermal vents is derived from leaching of basaltic-sulfide and seawater-derived sulfate that is reduced during high temperature water rock interaction. Conventional sulfur isotope studies, however, are inconclusive about the mass-balance between the two sources because 34S/32S ratios of vent fluid H2S and chimney sulfide minerals may reflect not only the mixing ratio but also isotope exchange between sulfate and sulfide. Here, we show that high-precision analysis of S-33 can provide a unique constraint because isotope mixing and isotope exchange result in different ??33S (?????33S-0.515 ??34S) values of up to 0.04??? even if ??34S values are identical. Detection of such small ??33S differences is technically feasible by using the SF6 dual-inlet mass-spectrometry protocol that has been improved to achieve a precision as good as 0.006??? (2??). Sulfide minerals (marcasite, pyrite, chalcopyrite, and sphalerite) and vent H2S collected from four active seafloor hydrothermal vent sites, East Pacific Rise (EPR) 9-10??N, 13??N, and 21??S and Mid-Atlantic Ridge (MAR) 37??N yield ??33S values ranging from -0.002 to 0.033 and ??34S from -0.5??? to 5.3???. The combined ??34S and ??33S systematics reveal that 73 to 89% of vent sulfides are derived from leaching from basaltic sulfide and only 11 to 27% from seawater-derived sulfate. Pyrite from EPR 13??N and marcasite from MAR 37??N are in isotope disequilibrium not only in ??34S but also in ??33S with respect to associated sphalerite and chalcopyrite, suggesting non-equilibrium sulfur isotope exchange between seawater sulfate and sulfide during pyrite precipitation. Seafloor hydrothermal vent sulfides are characterized by low ??33S values compared with biogenic sulfides, suggesting little or no contribution of sulfide from microbial sulfate reduction into hydrothermal sulfides at sediment-free mid-oceanic ridge systems. We conclude that 33S is an effective new tracer for interplay among seawater, oceanic crust and microbes in subseafloor hydrothermal sulfur cycles. ?? 2006 Elsevier Inc. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Geochimica et Cosmochimica Acta","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.gca.2006.11.017","issn":"00167037","usgsCitation":"Ono, S., Shanks, W.C., Rouxel, O., and Rumble, D., 2007, S-33 constraints on the seawater sulfate contribution in modern seafloor hydrothermal vent sulfides: Geochimica et Cosmochimica Acta, v. 71, no. 5, p. 1170-1182, https://doi.org/10.1016/j.gca.2006.11.017.","startPage":"1170","endPage":"1182","numberOfPages":"13","costCenters":[],"links":[{"id":476960,"rank":10000,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"https://hdl.handle.net/1912/1594","text":"External Repository"},{"id":214596,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.gca.2006.11.017"},{"id":242336,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"71","issue":"5","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505aaee8e4b0c8380cd872a5","contributors":{"authors":[{"text":"Ono, Shuhei","contributorId":100627,"corporation":false,"usgs":false,"family":"Ono","given":"Shuhei","email":"","affiliations":[{"id":13295,"text":"1Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139,","active":true,"usgs":false}],"preferred":false,"id":434884,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Shanks, Wayne C. III","contributorId":100527,"corporation":false,"usgs":true,"family":"Shanks","given":"Wayne","suffix":"III","email":"","middleInitial":"C.","affiliations":[],"preferred":false,"id":434883,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Rouxel, O.J.","contributorId":32001,"corporation":false,"usgs":true,"family":"Rouxel","given":"O.J.","email":"","affiliations":[],"preferred":false,"id":434881,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Rumble, D.","contributorId":80095,"corporation":false,"usgs":true,"family":"Rumble","given":"D.","affiliations":[],"preferred":false,"id":434882,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70032177,"text":"70032177 - 2007 - Suboxic deep seawater in the late Paleoproterozoic: Evidence from hematitic chert and iron formation related to seafloor-hydrothermal sulfide deposits, central Arizona, USA","interactions":[],"lastModifiedDate":"2012-03-12T17:21:56","indexId":"70032177","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1427,"text":"Earth and Planetary Science Letters","active":true,"publicationSubtype":{"id":10}},"title":"Suboxic deep seawater in the late Paleoproterozoic: Evidence from hematitic chert and iron formation related to seafloor-hydrothermal sulfide deposits, central Arizona, USA","docAbstract":"A current model for the evolution of Proterozoic deep seawater composition involves a change from anoxic sulfide-free to sulfidic conditions 1.8??Ga. In an earlier model the deep ocean became oxic at that time. Both models are based on the secular distribution of banded iron formation (BIF) in shallow marine sequences. We here present a new model based on rare earth elements, especially redox-sensitive Ce, in hydrothermal silica-iron oxide sediments from deeper-water, open-marine settings related to volcanogenic massive sulfide (VMS) deposits. In contrast to Archean, Paleozoic, and modern hydrothermal iron oxide sediments, 1.74 to 1.71??Ga hematitic chert (jasper) and iron formation in central Arizona, USA, show moderate positive to small negative Ce anomalies, suggesting that the redox state of the deep ocean then was at a transitional, suboxic state with low concentrations of dissolved O2 but no H2S. The presence of jasper and/or iron formation related to VMS deposits in other volcanosedimentary sequences ca. 1.79-1.69??Ga, 1.40??Ga, and 1.24??Ga also reflects oxygenated and not sulfidic deep ocean waters during these time periods. Suboxic conditions in the deep ocean are consistent with the lack of shallow-marine BIF ??? 1.8 to 0.8??Ga, and likely limited nutrient concentrations in seawater and, consequently, may have constrained biological evolution. ?? 2006 Elsevier B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Earth and Planetary Science Letters","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.epsl.2006.12.018","issn":"0012821X","usgsCitation":"Slack, J.F., Grenne, T., Bekker, A., Rouxel, O., and Lindberg, P.A., 2007, Suboxic deep seawater in the late Paleoproterozoic: Evidence from hematitic chert and iron formation related to seafloor-hydrothermal sulfide deposits, central Arizona, USA: Earth and Planetary Science Letters, v. 255, no. 1-2, p. 243-256, https://doi.org/10.1016/j.epsl.2006.12.018.","startPage":"243","endPage":"256","numberOfPages":"14","costCenters":[],"links":[{"id":215066,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.epsl.2006.12.018"},{"id":242835,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"255","issue":"1-2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b9d45e4b08c986b31d740","contributors":{"authors":[{"text":"Slack, J. F.","contributorId":75917,"corporation":false,"usgs":true,"family":"Slack","given":"J.","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":434879,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Grenne, Tor","contributorId":7460,"corporation":false,"usgs":false,"family":"Grenne","given":"Tor","email":"","affiliations":[{"id":35509,"text":"Geological Survey of Norway","active":true,"usgs":false}],"preferred":false,"id":434876,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Bekker, A.","contributorId":9480,"corporation":false,"usgs":true,"family":"Bekker","given":"A.","email":"","affiliations":[],"preferred":false,"id":434877,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Rouxel, O.J.","contributorId":32001,"corporation":false,"usgs":true,"family":"Rouxel","given":"O.J.","email":"","affiliations":[],"preferred":false,"id":434878,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Lindberg, P. A.","contributorId":79189,"corporation":false,"usgs":true,"family":"Lindberg","given":"P.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":434880,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}}
,{"id":70032153,"text":"70032153 - 2007 - Three-dimensional P-wave velocity structure derived from local earthquakes at the Katmai group of volcanoes, Alaska","interactions":[],"lastModifiedDate":"2019-03-04T14:51:22","indexId":"70032153","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2499,"text":"Journal of Volcanology and Geothermal Research","active":true,"publicationSubtype":{"id":10}},"title":"Three-dimensional P-wave velocity structure derived from local earthquakes at the Katmai group of volcanoes, Alaska","docAbstract":"<p><span>The three-dimensional P-wave velocity structure beneath the Katmai group of volcanoes is determined by inversion of more than 10,000 rays from over 1000 earthquakes recorded on a local 18 station short-period network between September 1996 and May 2001. The inversion is well constrained from sea level to about 6&nbsp;km below sea level and encompasses all of the Katmai volcanoes; Martin, Mageik, Trident, Griggs, Novarupta, Snowy, and Katmai caldera. The inversion reduced the average RMS travel-time error from 0.22&nbsp;s for locations from the standard one-dimensional model to 0.13&nbsp;s for the best three-dimensional model. The final model, from the 6th inversion step, reveals a prominent low velocity zone (3.6–5.0&nbsp;km/s) centered at Katmai Pass and extending from Mageik to Trident volcanoes. The anomaly has values about 20–25% slower than velocities outboard of the region (5.0–6.5&nbsp;km/s). Moderately low velocities (4.5–6.0&nbsp;km/s) are observed along the volcanic axis between Martin and Katmai Caldera. Griggs volcano, located about 10&nbsp;km behind (northwest of) the volcanic axis, has unremarkable velocities (5.0–5.7&nbsp;km/s) compared to non-volcanic regions. The highest velocities are observed between Snowy and Griggs volcanoes (5.5–6.5&nbsp;km/s). Relocated hypocenters for the best 3-D model are shifted significantly relative to the standard model with clusters of seismicity at Martin volcano shifting systematically deeper by about 1&nbsp;km to depths of 0 to 4&nbsp;km below sea level. Hypocenters for the Katmai Caldera are more tightly clustered, relocating beneath the 1912 scarp walls. The relocated hypocenters allow us to compare spatial frequency-size distributions (</span><i>b</i><span>-values) using one-dimensional and three-dimensional models. We find that the distribution of&nbsp;</span><i>b</i><span>&nbsp;is significantly changed for Martin volcano, which was characterized by variable values (0.8</span><span>&nbsp;</span><span>&lt;</span><span>&nbsp;</span><i>b</i><span>&nbsp;</span><span>&lt;</span><span>&nbsp;</span><span>2.0) with standard locations and more uniform values (0.8</span><span>&nbsp;</span><span>&lt;</span><span>&nbsp;</span><i>b</i><span>&nbsp;</span><span>&lt;</span><span>&nbsp;</span><span>1.2) after relocation. Other seismic clusters at Mageik (1.2</span><span>&nbsp;</span><span>&lt;</span><span>&nbsp;</span><i>b</i><span>&nbsp;</span><span>&lt;</span><span>&nbsp;</span><span>2.2), Trident (0.5</span><span>&nbsp;</span><span>&lt;</span><span>&nbsp;</span><i>b</i><span>&nbsp;</span><span>&lt;</span><span>&nbsp;</span><span>1.5) and Katmai Caldera (0.8</span><span>&nbsp;</span><span>&lt;</span><span>&nbsp;</span><i>b</i><span>&nbsp;</span><span>&lt;</span><span>&nbsp;</span><span>1.8) had stable&nbsp;</span><i>b</i><span>-values indicating the robustness of the observations. The strong high&nbsp;</span><i>b</i><span>-value region at Mageik volcano is mainly associated with an earthquake swarm in October, 1996 that possibly indicates a shallow intrusion or influx of gas. The new velocity and spatial&nbsp;</span><i>b</i><span>-value results, in conjunction with prior gravity (Bouguer anomalies up to −</span><span>&nbsp;</span><span>40&nbsp;mgal) and interferometry (several cm uplift) data, provide strong evidence in favor of partially molten rock at shallow depths beneath the Mageik–Katmai–Novarupta region. Moderately low velocities beneath Martin and Katmai suggest that old, mostly solidified intrusions exist beneath these volcanoes. Higher relative velocities beneath the Griggs and Snowy vents suggest that no magma is resident in the shallow crust beneath these volcanoes.</span></p>","language":"English","publisher":"Elsevier","doi":"10.1016/j.jvolgeores.2006.06.022","issn":"03770273","usgsCitation":"Jolly, A., Moran, S., McNutt, S., and Stone, D., 2007, Three-dimensional P-wave velocity structure derived from local earthquakes at the Katmai group of volcanoes, Alaska: Journal of Volcanology and Geothermal Research, v. 159, no. 4, p. 326-342, https://doi.org/10.1016/j.jvolgeores.2006.06.022.","productDescription":"17 p.","startPage":"326","endPage":"342","costCenters":[{"id":615,"text":"Volcano Hazards Program","active":true,"usgs":true}],"links":[{"id":242473,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":214723,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.jvolgeores.2006.06.022"}],"volume":"159","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bb320e4b08c986b325bc6","contributors":{"authors":[{"text":"Jolly, A.D.","contributorId":64274,"corporation":false,"usgs":true,"family":"Jolly","given":"A.D.","affiliations":[],"preferred":false,"id":434757,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Moran, S.C. 0000-0001-7308-9649","orcid":"https://orcid.org/0000-0001-7308-9649","contributorId":78896,"corporation":false,"usgs":true,"family":"Moran","given":"S.C.","affiliations":[],"preferred":false,"id":434758,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"McNutt, S.R.","contributorId":26722,"corporation":false,"usgs":true,"family":"McNutt","given":"S.R.","email":"","affiliations":[],"preferred":false,"id":434756,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Stone, D.B.","contributorId":17266,"corporation":false,"usgs":true,"family":"Stone","given":"D.B.","email":"","affiliations":[],"preferred":false,"id":434755,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
,{"id":70032123,"text":"70032123 - 2007 - Natural landscape and stream segment attributes influencing the distribution and relative abundance of riverine smallmouth bass in Missouri","interactions":[],"lastModifiedDate":"2012-03-12T17:21:28","indexId":"70032123","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2886,"text":"North American Journal of Fisheries Management","active":true,"publicationSubtype":{"id":10}},"title":"Natural landscape and stream segment attributes influencing the distribution and relative abundance of riverine smallmouth bass in Missouri","docAbstract":"Protecting and restoring fish populations on a regional basis are most effective if the multiscale factors responsible for the relative quality of a fishery are known. We spatially linked Missouri's statewide historical fish collections to environmental features in a geographic information system, which was used as a basis for modeling the importance of landscape and stream segment features in supporting a population of smallmouth bass Micropterus dolomieu. Decision tree analyses were used to develop probability-based models to predict statewide occurrence and within-range relative abundances. We were able to identify the range of smallmouth bass throughout Missouri and the probability of occurrence within that range by using a few broad landscape variables: the percentage of coarse-textured soils in the watershed, watershed relief, and the percentage of soils with low permeability in the watershed. The within-range relative abundance model included both landscape and stream segment variables. As with the statewide probability of occurrence model, soil permeability was particularly significant. The predicted relative abundance of smallmouth bass in stream segments containing low percentages of permeable soils was further influenced by channel gradient, stream size, spring-flow volume, and local slope. Assessment of model accuracy with an independent data set showed good concordance. A conceptual framework involving naturally occurring factors that affect smallmouth bass potential is presented as a comparative model for assessing transferability to other geographic areas and for studying potential land use and biotic effects. We also identify the benefits, caveats, and data requirements necessary to improve predictions and promote ecological understanding. ?? Copyright by the American Fisheries Society 2007.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"North American Journal of Fisheries Management","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1577/M06-122.1","issn":"02755947","usgsCitation":"Brewer, S., Rabeni, C., Sowa, S., and Annis, G., 2007, Natural landscape and stream segment attributes influencing the distribution and relative abundance of riverine smallmouth bass in Missouri: North American Journal of Fisheries Management, v. 27, no. 1, p. 326-341, https://doi.org/10.1577/M06-122.1.","startPage":"326","endPage":"341","numberOfPages":"16","costCenters":[],"links":[{"id":214752,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1577/M06-122.1"},{"id":242502,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"27","issue":"1","noUsgsAuthors":false,"publicationDate":"2007-02-01","publicationStatus":"PW","scienceBaseUri":"505a6343e4b0c8380cd723b5","contributors":{"authors":[{"text":"Brewer, S.K.","contributorId":34284,"corporation":false,"usgs":true,"family":"Brewer","given":"S.K.","email":"","affiliations":[],"preferred":false,"id":434625,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Rabeni, C.F.","contributorId":67823,"corporation":false,"usgs":true,"family":"Rabeni","given":"C.F.","affiliations":[],"preferred":false,"id":434628,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Sowa, S.P.","contributorId":43142,"corporation":false,"usgs":true,"family":"Sowa","given":"S.P.","affiliations":[],"preferred":false,"id":434626,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Annis, G.","contributorId":50745,"corporation":false,"usgs":true,"family":"Annis","given":"G.","email":"","affiliations":[],"preferred":false,"id":434627,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}}
]}