Polar bears (Ursus maritimus) in the northern Alaska region den in coastal areas and on offshore drifting ice. We evaluated changes in the distribution of polar bear maternal dens between 1985 and 2005, using satellite telemetry. We determined the distribution of maternal dens occupied by 89 satellite collared female polar bears between 137°W and 167°W longitude. The proportion of dens on pack ice declined from 62% in 1985–1994 to 37% in 1998–2004 (P = 0.044) and among pack ice dens fewer occurred in the western Beaufort Sea after 1998. We evaluated whether hunting, attraction to bowhead whale remains, or changes in sea ice could explain changes in den distribution. We concluded that denning distribution changed in response to reductions in stable old ice, increases in unconsolidated ice, and lengthening of the melt season. In consort, these changes have likely reduced the availability and quality of pack ice denning habitat. Further declines in sea ice availability are predicted. Therefore, we expect the proportion of polar bears denning in coastal areas will continue to increase, until such time as the autumn ice retreats far enough from shore that it precludes offshore pregnant females from reaching the Alaska coast in advance of denning.
","language":"English","publisher":"Springer","doi":"10.1007/s00300-007-0300-4","issn":"07224060","usgsCitation":"Fischbach, A., Amstrup, S.C., and Douglas, D., 2007, Landward and eastward shift of Alaskan polar bear denning associated with recent sea ice changes: Polar Biology, v. 30, no. 11, p. 1395-1405, https://doi.org/10.1007/s00300-007-0300-4.","productDescription":"11 p.","startPage":"1395","endPage":"1405","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":114,"text":"Alaska Science Center","active":true,"usgs":true}],"links":[{"id":239988,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alaska","volume":"30","issue":"11","noUsgsAuthors":false,"publicationDate":"2007-06-07","publicationStatus":"PW","scienceBaseUri":"505a446de4b0c8380cd66acf","contributors":{"authors":[{"text":"Fischbach, Anthony S. 0000-0002-6555-865X afischbach@usgs.gov","orcid":"https://orcid.org/0000-0002-6555-865X","contributorId":200780,"corporation":false,"usgs":true,"family":"Fischbach","given":"Anthony S.","email":"afischbach@usgs.gov","affiliations":[{"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":431278,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Amstrup, Steven C.","contributorId":67034,"corporation":false,"usgs":false,"family":"Amstrup","given":"Steven","email":"","middleInitial":"C.","affiliations":[{"id":13182,"text":"Polar Bears International","active":true,"usgs":false}],"preferred":false,"id":431280,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Douglas, David C. 0000-0003-0186-1104 ddouglas@usgs.gov","orcid":"https://orcid.org/0000-0003-0186-1104","contributorId":150115,"corporation":false,"usgs":true,"family":"Douglas","given":"David C.","email":"ddouglas@usgs.gov","affiliations":[{"id":117,"text":"Alaska Science Center Biology WTEB","active":true,"usgs":true},{"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":431279,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70031227,"text":"70031227 - 2007 - A biological assessment of streams in the eastern United States using a predictive model for macroinvertebrate assemblages","interactions":[],"lastModifiedDate":"2012-03-12T17:21:18","indexId":"70031227","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2529,"text":"Journal of the American Water Resources Association","active":true,"publicationSubtype":{"id":10}},"title":"A biological assessment of streams in the eastern United States using a predictive model for macroinvertebrate assemblages","docAbstract":"A predictive model (RIVPACS-type) for benthic macroinvertebrates was constructed to assess the biological condition of 1,087 streams sampled throughout the eastern United States from 1993-2003 as part of the U.S. Geological Survey's National Water-Quality Assessment Program. A subset of 338 sites was designated as reference quality, 28 of which were withheld from model calibration and used to independently evaluate model precision and accuracy. The ratio of observed (O) to expected (E) taxa richness was used as a continuous measure of biological condition, and sites with O/E values <0.8 were classified as biologically degraded. Spatiotemporal variability of O/E values was evaluated with repeated annual and within-site samples at reference sites. Values of O/E were regressed on a measure of urbanization in three regions and compared among streams in different land-use settings. The model accurately predicted the expected taxa at validation sites with high precision (SD = 0.11). Within-site spatial variability in O/E values was much larger than annual and among-site variation at reference sites and was likely caused by environmental differences among sampled reaches. Values of O/E were significantly correlated with basin road density in the Boston, Massachusetts (p < 0.001), Birmingham, Alabama (p = 0.002), and Green Bay, Wisconsin (p = 0.034) metropolitan areas, but the strength of the relations varied among regions. Urban streams were more depleted of taxa than streams in other land-use settings, but larger networks of riparian forest appeared to mediate biological degradation. Taxa that occurred less frequently than predicted by the model were those known to be generally intolerant of a variety of anthropogenic stressors. ?? 2007 American Water Resources Association.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of the American Water Resources Association","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1111/j.1752-1688.2007.00097.x","issn":"1093474X","usgsCitation":"Carlisle, D., and Meador, M.R., 2007, A biological assessment of streams in the eastern United States using a predictive model for macroinvertebrate assemblages: Journal of the American Water Resources Association, v. 43, no. 5, p. 1194-1207, https://doi.org/10.1111/j.1752-1688.2007.00097.x.","startPage":"1194","endPage":"1207","numberOfPages":"14","costCenters":[],"links":[{"id":211312,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1111/j.1752-1688.2007.00097.x"},{"id":238581,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"43","issue":"5","noUsgsAuthors":false,"publicationDate":"2007-09-15","publicationStatus":"PW","scienceBaseUri":"5059e327e4b0c8380cd45e4c","contributors":{"authors":[{"text":"Carlisle, D.M.","contributorId":81059,"corporation":false,"usgs":true,"family":"Carlisle","given":"D.M.","email":"","affiliations":[],"preferred":false,"id":430611,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Meador, M. R.","contributorId":74400,"corporation":false,"usgs":true,"family":"Meador","given":"M.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":430610,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70031159,"text":"70031159 - 2007 - Reinterpretation of Paleoproterozoic accretionary boundaries of the north-central United States based on a new aeromagnetic-geologic compilation","interactions":[],"lastModifiedDate":"2012-03-12T17:21:19","indexId":"70031159","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3112,"text":"Precambrian Research","active":true,"publicationSubtype":{"id":10}},"title":"Reinterpretation of Paleoproterozoic accretionary boundaries of the north-central United States based on a new aeromagnetic-geologic compilation","docAbstract":"The Paleoproterozoic crust in the north-central U.S. represents intact juvenile terranes accreted to the rifted Archean Superior craton. A new tectonic province map, based on the interpretation of a new aeromagnetic compilation, published geologic maps, and recent geochronologic data, shows progressive accretion of juvenile arc terranes from ca. 1900-1600 Ma. Contrary to earlier models, geon 18 Penokean-interval crust is primarily confined to a ???2100 Ma tectonic embayment of the rifted Superior craton. The newly defined Spirit Lake tectonic zone, characterized by a sharp magnetic discontinuity that marks the southern limit of Archean and Penokean-interval rocks, is here interpreted to represent an eastern analog of the Cheyenne belt suture zone in southern Wyoming. South of this boundary, geon 17 Yavapai-interval rocks form the basement upon which 1750 Ma rhyolite and succeeding quartzite sequences were deposited. Substantial portions of the Penokean and Yavapai terranes were subsequently deformed during the 1650-1630 Ma Mazatzal orogeny. The northern boundary of the Mazatzal terrane is obscured by abundant 1470-1430 Ma \"anorogenic\" plutons that stitched the suture with the older Yavapai terrane rocks. These data reveal a progressive tectonic younging to the south as the Laurentian craton grew southward and stabilized during the Proterozoic. Late Mesoproterozoic rift magmatism produced pronounced geophysical anomalies, indicating strong, but localized crustal modification. In comparison to the western U.S., little tectonism has occurred here in the last 1 billion years, providing a uniquely preserved record of the Precambrian evolution of the continental U.S. lithosphere. ?? 2007 Elsevier B.V. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Precambrian Research","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.precamres.2007.02.023","issn":"03019268","usgsCitation":"Holm, D., Anderson, R., Boerboom, T., Cannon, W., Chandler, V., Jirsa, M., Miller, J., Schneider, D., Schulz, K.J., and Van Schmus, W.R., 2007, Reinterpretation of Paleoproterozoic accretionary boundaries of the north-central United States based on a new aeromagnetic-geologic compilation: Precambrian Research, v. 157, no. 1-4, p. 71-79, https://doi.org/10.1016/j.precamres.2007.02.023.","startPage":"71","endPage":"79","numberOfPages":"9","costCenters":[],"links":[{"id":211378,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.precamres.2007.02.023"},{"id":238658,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"157","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"50e4a608e4b0e8fec6cdc07a","contributors":{"authors":[{"text":"Holm, D.K.","contributorId":68955,"corporation":false,"usgs":true,"family":"Holm","given":"D.K.","email":"","affiliations":[],"preferred":false,"id":430303,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Anderson, R.","contributorId":104191,"corporation":false,"usgs":false,"family":"Anderson","given":"R.","affiliations":[],"preferred":false,"id":430309,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Boerboom, Terrence","contributorId":11785,"corporation":false,"usgs":true,"family":"Boerboom","given":"Terrence","affiliations":[],"preferred":false,"id":430300,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Cannon, W.F. 0000-0002-2699-8118","orcid":"https://orcid.org/0000-0002-2699-8118","contributorId":70382,"corporation":false,"usgs":true,"family":"Cannon","given":"W.F.","affiliations":[],"preferred":false,"id":430305,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Chandler, V.","contributorId":69776,"corporation":false,"usgs":true,"family":"Chandler","given":"V.","email":"","affiliations":[],"preferred":false,"id":430304,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Jirsa, M.","contributorId":82125,"corporation":false,"usgs":true,"family":"Jirsa","given":"M.","affiliations":[],"preferred":false,"id":430307,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Miller, J.","contributorId":16939,"corporation":false,"usgs":true,"family":"Miller","given":"J.","affiliations":[],"preferred":false,"id":430301,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Schneider, D.A.","contributorId":58457,"corporation":false,"usgs":true,"family":"Schneider","given":"D.A.","email":"","affiliations":[],"preferred":false,"id":430302,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Schulz, K. J.","contributorId":79131,"corporation":false,"usgs":true,"family":"Schulz","given":"K.","email":"","middleInitial":"J.","affiliations":[],"preferred":false,"id":430306,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Van Schmus, W. R.","contributorId":83114,"corporation":false,"usgs":true,"family":"Van Schmus","given":"W.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":430308,"contributorType":{"id":1,"text":"Authors"},"rank":10}]}} ,{"id":70031075,"text":"70031075 - 2007 - Modeled impact of anthropogenic land cover change on climate","interactions":[],"lastModifiedDate":"2012-03-12T17:21:16","indexId":"70031075","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2216,"text":"Journal of Climate","active":true,"publicationSubtype":{"id":10}},"title":"Modeled impact of anthropogenic land cover change on climate","docAbstract":"Equilibrium experiments with the Geophysical Fluid Dynamics Laboratory's climate model are used to investigate the impact of anthropogenic land cover change on climate. Regions of altered land cover include large portions of Europe, India, eastern China, and the eastern United States. Smaller areas of change are present in various tropical regions. This study focuses on the impacts of biophysical changes associated with the land cover change (albedo, root and stomatal properties, roughness length), which is almost exclusively a conversion from forest to grassland in the model; the effects of irrigation or other water management practices and the effects of atmospheric carbon dioxide changes associated with land cover conversion are not included in these experiments. The model suggests that observed land cover changes have little or no impact on globally averaged climatic variables (e.g., 2-m air temperature is 0.008 K warmer in a simulation with 1990 land cover compared to a simulation with potential natural vegetation cover). Differences in the annual mean climatic fields analyzed did not exhibit global field significance. Within some of the regions of land cover change, however, there are relatively large changes of many surface climatic variables. These changes are highly significant locally in the annual mean and in most months of the year in eastern Europe and northern India. They can be explained mainly as direct and indirect consequences of model-prescribed increases in surface albedo, decreases in rooting depth, and changes of stomatal control that accompany deforestation. ?? 2007 American Meteorological Society.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Climate","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1175/JCLI4185.1","issn":"08948755","usgsCitation":"Findell, K., Shevliakova, E., Milly, P., and Stouffer, R., 2007, Modeled impact of anthropogenic land cover change on climate: Journal of Climate, v. 20, no. 14, p. 3621-3634, https://doi.org/10.1175/JCLI4185.1.","startPage":"3621","endPage":"3634","numberOfPages":"14","costCenters":[],"links":[{"id":477007,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1175/jcli4185.1","text":"Publisher Index Page"},{"id":238874,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":211567,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1175/JCLI4185.1"}],"volume":"20","issue":"14","noUsgsAuthors":false,"publicationDate":"2007-07-15","publicationStatus":"PW","scienceBaseUri":"505a5bbde4b0c8380cd6f78e","contributors":{"authors":[{"text":"Findell, K.L.","contributorId":20137,"corporation":false,"usgs":true,"family":"Findell","given":"K.L.","affiliations":[],"preferred":false,"id":429922,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Shevliakova, E.","contributorId":27238,"corporation":false,"usgs":true,"family":"Shevliakova","given":"E.","affiliations":[],"preferred":false,"id":429924,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Milly, P. C. D.","contributorId":100489,"corporation":false,"usgs":true,"family":"Milly","given":"P. C. D.","affiliations":[],"preferred":false,"id":429925,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Stouffer, R.J.","contributorId":23757,"corporation":false,"usgs":true,"family":"Stouffer","given":"R.J.","email":"","affiliations":[],"preferred":false,"id":429923,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70030861,"text":"70030861 - 2007 - Environmental geochemistry at Red Mountain, an unmined volcanogenic massive sulphide deposit in the Bonnifield district, Alaska Range, east-central Alaska","interactions":[],"lastModifiedDate":"2019-12-19T09:53:27","indexId":"70030861","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1758,"text":"Geochemistry: Exploration, Environment, Analysis","active":true,"publicationSubtype":{"id":10}},"title":"Environmental geochemistry at Red Mountain, an unmined volcanogenic massive sulphide deposit in the Bonnifield district, Alaska Range, east-central Alaska","docAbstract":"The unmined, pyrite-rich Red Mountain (Dry Creek) deposit displays a remarkable environmental footprint of natural acid generation, high metal and exceedingly high rare earth element (REE) concentrations in surface waters. The volcanogenic massive sulphide deposit exhibits well-constrained examples of acid-generating, metal-leaching, metal-precipitation and self-mitigation (via co-precipitation, dilution and neutralization) processes that occur in an undisturbed natural setting, a rare occurrence in North America. Oxidative dissolution of pyrite and associated secondary reactions under near-surface oxidizing conditions are the primary causes for the acid generation and metal leaching. The deposit is hosted in Devonian to Mississippian felsic metavolcanic rocks of the Mystic Creek Member of the Totatlanika Schist.
Water samples with the lowest pH (many below 3.5), highest specific conductance (commonly >2500 μS/cm) and highest major- and trace-element concentrations are from springs and streams within the quartz–sericite–pyrite alteration zone. Aluminum, Cd, Co, Cu, Fe, Mn, Ni, Pb, Y, Zn and, particularly, the REEs are found in high concentrations, ranging across four orders of magnitude. Waters collected upstream from the alteration zone have near-neutral pH, lower specific conductance (370 to 830 μS/cm), lower metal concentrations and measurable alkalinities. Water samples collected downstream of the alteration zone have pH and metal concentrations intermediate between these two extremes. Stream sediments are anomalous in Zn, Pb, S, Fe, Cu, As, Co, Sb and Cd relative to local and regional background abundances. Red Mountain Creek and its tributaries do not, and probably never have, supported significant aquatic life.
","language":"English","publisher":"Geological Society of London","doi":"10.1144/1467-7873/07-136","issn":"14677873","usgsCitation":"Eppinger, R.G., Briggs, P., Dusel-Bacon, C., Giles, S.A., Gough, L.P., Hammarstrom, J.M., and Hubbard, B.E., 2007, Environmental geochemistry at Red Mountain, an unmined volcanogenic massive sulphide deposit in the Bonnifield district, Alaska Range, east-central Alaska: Geochemistry: Exploration, Environment, Analysis, v. 7, no. 3, p. 207-223, https://doi.org/10.1144/1467-7873/07-136.","productDescription":"17 p.","startPage":"207","endPage":"223","numberOfPages":"17","costCenters":[{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true},{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true},{"id":387,"text":"Mineral Resources Program","active":true,"usgs":true}],"links":[{"id":238667,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alaska","otherGeospatial":"Red Mountain","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -151.875,\n 63.39152174400882\n ],\n [\n -146.1181640625,\n 63.39152174400882\n ],\n [\n -146.1181640625,\n 65.45826097864811\n ],\n [\n -151.875,\n 65.45826097864811\n ],\n [\n -151.875,\n 63.39152174400882\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"7","issue":"3","noUsgsAuthors":false,"publicationDate":"2022-06-06","publicationStatus":"PW","scienceBaseUri":"505a09c5e4b0c8380cd5205f","contributors":{"authors":[{"text":"Eppinger, Robert G. eppinger@usgs.gov","contributorId":849,"corporation":false,"usgs":true,"family":"Eppinger","given":"Robert","email":"eppinger@usgs.gov","middleInitial":"G.","affiliations":[{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":777756,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Briggs, Paul H.","contributorId":107691,"corporation":false,"usgs":true,"family":"Briggs","given":"Paul H.","affiliations":[],"preferred":false,"id":428987,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Dusel-Bacon, Cynthia 0000-0001-8481-739X cdusel@usgs.gov","orcid":"https://orcid.org/0000-0001-8481-739X","contributorId":2797,"corporation":false,"usgs":true,"family":"Dusel-Bacon","given":"Cynthia","email":"cdusel@usgs.gov","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":true,"id":777757,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Giles, Stuart A. 0000-0002-8696-5078 sgiles@usgs.gov","orcid":"https://orcid.org/0000-0002-8696-5078","contributorId":1233,"corporation":false,"usgs":true,"family":"Giles","given":"Stuart","email":"sgiles@usgs.gov","middleInitial":"A.","affiliations":[{"id":387,"text":"Mineral Resources Program","active":true,"usgs":true},{"id":171,"text":"Central Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":777758,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Gough, Larry P. lgough@usgs.gov","contributorId":1230,"corporation":false,"usgs":true,"family":"Gough","given":"Larry","email":"lgough@usgs.gov","middleInitial":"P.","affiliations":[],"preferred":true,"id":777759,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Hammarstrom, Jane M. 0000-0003-2742-3460 jhammars@usgs.gov","orcid":"https://orcid.org/0000-0003-2742-3460","contributorId":1226,"corporation":false,"usgs":true,"family":"Hammarstrom","given":"Jane","email":"jhammars@usgs.gov","middleInitial":"M.","affiliations":[{"id":387,"text":"Mineral Resources Program","active":true,"usgs":true},{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":777760,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"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":777761,"contributorType":{"id":1,"text":"Authors"},"rank":7}]}} ,{"id":70030722,"text":"70030722 - 2007 - Three new percid fishes (Percidae: Percina) from the Mobile Basin drainage of Alabama, Georgia, and Tennessee","interactions":[],"lastModifiedDate":"2021-06-16T16:12:18.024251","indexId":"70030722","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3814,"text":"Zootaxa","onlineIssn":"1175-5334","printIssn":"1175-5326","active":true,"publicationSubtype":{"id":10}},"title":"Three new percid fishes (Percidae: Percina) from the Mobile Basin drainage of Alabama, Georgia, and Tennessee","docAbstract":"Three new species of Percina are described from upland drainages of the Mobile Basin. Two of the three species are narrowly distributed: P. kusha, the Bridled Darter, is currently known only from the Conasauga River drainage in Georgia and Tennessee and Etowah River drainage in Georgia, both tributaries of the Coosa River, and P. sipsi, the Bankhead Darter, which is restricted to tributaries of Sipsey Fork of the Black Warrior River in northwestern Alabama. The third species, P. smithvanizi, the Muscadine Darter, occurs above the Fall Line in the Tallapoosa River drainage in eastern Alabama and western Georgia. In a molecular analysis using mitochondrial cytochrome b sequence data, P. kusha and P. smithvanizi were recovered as sister species, while Percina sipsi was recovered in a clade consisting of P. aurolineata (P. sciera + P. sipsi). Two of the three species, P. kusha and P. sipsi, are considered to be imperiled species and are in need of conservation actions to prevent their extinction. Description of these three darters increases the number of described species of Percina to 44. Sixteen are known to occur in the Mobile Basin, including nine that are endemic.
","language":"English","publisher":"Magnolia Press","doi":"10.11646/zootaxa.1549.1.1","usgsCitation":"Williams, J., Neely, D., Walsh, S., and Burkhead, N., 2007, Three new percid fishes (Percidae: Percina) from the Mobile Basin drainage of Alabama, Georgia, and Tennessee: Zootaxa, no. 1549, p. 1-28, https://doi.org/10.11646/zootaxa.1549.1.1.","productDescription":"28 p.","startPage":"1","endPage":"28","costCenters":[{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true}],"links":[{"id":239609,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Alabama, Georgia, Tennessee","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -90.04394531249999,\n 35.567980458012094\n ],\n [\n -90.4833984375,\n 34.70549341022544\n ],\n [\n -89.82421875,\n 34.77771580360469\n ],\n [\n -89.1650390625,\n 34.77771580360469\n ],\n [\n -88.1982421875,\n 34.77771580360469\n ],\n [\n -88.41796875,\n 30.372875188118016\n ],\n [\n -85.8251953125,\n 30.637912028341123\n ],\n [\n -81.123046875,\n 30.486550842588485\n ],\n [\n -80.8154296875,\n 32.32427558887655\n ],\n [\n -82.177734375,\n 33.90689555128866\n ],\n [\n -83.3642578125,\n 35.31736632923788\n ],\n [\n -81.0791015625,\n 36.66841891894786\n ],\n [\n -89.20898437499999,\n 36.421282443649496\n ],\n [\n -90.04394531249999,\n 35.567980458012094\n ]\n ]\n ]\n }\n }\n ]\n}","issue":"1549","edition":"1","noUsgsAuthors":false,"publicationDate":"2007-08-15","publicationStatus":"PW","scienceBaseUri":"505bb311e4b08c986b325b71","contributors":{"authors":[{"text":"Williams, J.D.","contributorId":74701,"corporation":false,"usgs":true,"family":"Williams","given":"J.D.","email":"","affiliations":[],"preferred":false,"id":428392,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Neely, D.A.","contributorId":103083,"corporation":false,"usgs":true,"family":"Neely","given":"D.A.","email":"","affiliations":[],"preferred":false,"id":428393,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Walsh, S. J. 0000-0002-1009-8537","orcid":"https://orcid.org/0000-0002-1009-8537","contributorId":62171,"corporation":false,"usgs":true,"family":"Walsh","given":"S. J.","affiliations":[],"preferred":false,"id":428391,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Burkhead, N.M.","contributorId":34456,"corporation":false,"usgs":true,"family":"Burkhead","given":"N.M.","affiliations":[],"preferred":false,"id":428390,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70030719,"text":"70030719 - 2007 - Passive aerobic treatment of net-alkaline, iron-laden drainage from a flooded underground anthracite mine, Pennsylvania, USA","interactions":[],"lastModifiedDate":"2012-03-12T17:21:10","indexId":"70030719","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2745,"text":"Mine Water and the Environment","active":true,"publicationSubtype":{"id":10}},"title":"Passive aerobic treatment of net-alkaline, iron-laden drainage from a flooded underground anthracite mine, Pennsylvania, USA","docAbstract":"This report evaluates the results of a continuous 4.5-day laboratory aeration experiment and the first year of passive, aerobic treatment of abandoned mine drainage (AMD) from a typical flooded underground anthracite mine in eastern Pennsylvania, USA. During 1991-2006, the AMD source, locally known as the Otto Discharge, had flows from 20 to 270 L/s (median 92 L/s) and water quality that was consistently suboxic (median 0.9 mg/L O2) and circumneutral (pH ??? 6.0; net alkalinity >10) with moderate concentrations of dissolved iron and manganese and low concentrations of dissolved aluminum (medians of 11, 2.2, and <0.2 mg/L, respectively). In 2001, the laboratory aeration experiment demonstrated rapid oxidation of ferrous iron (Fe 2+) without supplemental alkalinity; the initial Fe2+ concentration of 16.4 mg/L decreased to less than 0.5 mg/L within 24 h; pH values increased rapidly from 5.8 to 7.2, ultimately attaining a steady-state value of 7.5. The increased pH coincided with a rapid decrease in the partial pressure of carbon dioxide (PCO2) from an initial value of 10 -1.1atm to a steady-state value of 10-3.1atm. From these results, a staged aerobic treatment system was conceptualized consisting of a 2 m deep pond with innovative aeration and recirculation to promote rapid oxidation of Fe2+, two 0.3 m deep wetlands to facilitate iron solids removal, and a supplemental oxic limestone drain for dissolved manganese and trace-metal removal. The system was constructed, but without the aeration mechanism, and began operation in June 2005. During the first 12 months of operation, estimated detention times in the treatment system ranged from 9 to 38 h. However, in contrast with 80-100% removal of Fe2+ over similar elapsed times during the laboratory aeration experiment, the treatment system typically removed less than 35% of the influent Fe2+. Although concentrations of dissolved CO2 decreased progressively within the treatment system, the PCO2 values for treated effluent remained elevated (10-2.4 to 10-1.7atm). The elevated PCO 2 maintained the pH within the system at values less than 7 and hence slowed the rate of Fe2+ oxidation compared to the aeration experiment. Kinetic models of Fe2+ oxidation that consider effects of pH and dissolved O2 were incorporated in the geochemical computer program PHREEQC to evaluate the effects of detention time, pH, and other variables on Fe2+ oxidation and removal rates. These models and the laboratory aeration experiment indicate that performance of this and other aerobic wetlands for treatment of net-alkaline AMD could be improved by aggressive, continuous aeration in the initial stage to decrease PCO 2, increase pH, and accelerate Fe2+ oxidation. ?? 2007 Springer-Verlag.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Mine Water and the Environment","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1007/s10230-007-0002-8","issn":"10259112","usgsCitation":"Cravotta, C., 2007, Passive aerobic treatment of net-alkaline, iron-laden drainage from a flooded underground anthracite mine, Pennsylvania, USA: Mine Water and the Environment, v. 26, no. 3, p. 128-149, https://doi.org/10.1007/s10230-007-0002-8.","startPage":"128","endPage":"149","numberOfPages":"22","costCenters":[],"links":[{"id":212138,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1007/s10230-007-0002-8"},{"id":239574,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"26","issue":"3","noUsgsAuthors":false,"publicationDate":"2007-08-18","publicationStatus":"PW","scienceBaseUri":"505a7576e4b0c8380cd77b70","contributors":{"authors":[{"text":"Cravotta, C.A. III","contributorId":18405,"corporation":false,"usgs":true,"family":"Cravotta","given":"C.A.","suffix":"III","email":"","affiliations":[],"preferred":false,"id":428378,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70030190,"text":"70030190 - 2007 - Seismic velocity structure and seismotectonics of the eastern San Francisco Bay region, California","interactions":[],"lastModifiedDate":"2023-08-10T11:08:16.364304","indexId":"70030190","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":"Seismic velocity structure and seismotectonics of the eastern San Francisco Bay region, California","docAbstract":"The Hayward Fault System is considered the most likely fault system in the San Francisco Bay Area, California, to produce a major earthquake in the next 30 years. To better understand this fault system, we use microseismicity to study its structure and kinematics. We present a new 3D seismic-velocity model for the eastern San Francisco Bay region, using microseismicity and controlled sources, which reveals a ∼10% velocity contrast across the Hayward fault in the upper 10 km, with higher velocity in the Franciscan Complex to the west relative to the Great Valley Sequence to the east. This contrast is imaged more sharply in our localized model than in previous regional-scale models. Thick Cenozoic sedimentary basins, such as the Livermore basin, which may experience particularly strong shaking during an earthquake, are imaged in the model.
","language":"English","publisher":"Seismological Society of America","doi":"10.1785/0120060032","issn":"00371106","usgsCitation":"Hardebeck, J., Michael, A., and Brocher, T., 2007, Seismic velocity structure and seismotectonics of the eastern San Francisco Bay region, California: Bulletin of the Seismological Society of America, v. 97, no. 3, p. 826-842, https://doi.org/10.1785/0120060032.","productDescription":"17 p.","startPage":"826","endPage":"842","costCenters":[],"links":[{"id":239502,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","otherGeospatial":"San Francisco Bay area","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -123.09890285663033,\n 38.418772287805865\n ],\n [\n -123.09890285663033,\n 37.186710878757324\n ],\n [\n -121.47362362473098,\n 37.186710878757324\n ],\n [\n -121.47362362473098,\n 38.418772287805865\n ],\n [\n -123.09890285663033,\n 38.418772287805865\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"97","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b8b76e4b08c986b317850","contributors":{"authors":[{"text":"Hardebeck, J.L.","contributorId":98862,"corporation":false,"usgs":true,"family":"Hardebeck","given":"J.L.","email":"","affiliations":[],"preferred":false,"id":426070,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Michael, A.J. 0000-0002-2403-5019","orcid":"https://orcid.org/0000-0002-2403-5019","contributorId":52192,"corporation":false,"usgs":true,"family":"Michael","given":"A.J.","affiliations":[],"preferred":false,"id":426068,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Brocher, T.M. 0000-0002-9740-839X","orcid":"https://orcid.org/0000-0002-9740-839X","contributorId":69994,"corporation":false,"usgs":true,"family":"Brocher","given":"T.M.","affiliations":[],"preferred":false,"id":426069,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70030141,"text":"70030141 - 2007 - Cosmogenic 10Be and 36Cl geochronology of offset alluvial fans along the northern Death Valley fault zone: Implications for transient strain in the eastern California shear zone","interactions":[],"lastModifiedDate":"2012-03-12T17:21:05","indexId":"70030141","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":"Cosmogenic 10Be and 36Cl geochronology of offset alluvial fans along the northern Death Valley fault zone: Implications for transient strain in the eastern California shear zone","docAbstract":"The northern Death Valley fault zone (NDVFZ) has long been recognized as a major right-lateral strike-slip fault in the eastern California shear zone (ECSZ). However, its geologic slip rate has been difficult to determine. Using high-resolution digital topographic imagery and terrestrial cosmogenic nuclide dating, we present the first geochronologically determined slip rate for the NDVFZ. Our study focuses on the Red Wall Canyon alluvial fan, which exposes clean dextral offsets of seven channels. Analysis of airborne laser swath mapping data indicates ???297 ?? 9 m of right-lateral displacement on the fault system since the late Pleistocene. In situ terrestrial cosmogenic 10Be and 36C1 geochronology was used to date the Red Wall Canyon fan and a second, correlative fan also cut by the fault. Beryllium 10 dates from large cobbles and boulders provide a maximum age of 70 +22/-20 ka for the offset landforms. The minimum age of the alluvial fan deposits based on 36Cl depth profiles is 63 ?? 8 ka. Combining the offset measurement with the cosmogenic 10Be date yields a geologic fault slip rate of 4.2 +1.9/-1.1 mm yr-1, whereas the 36Cl data indicate 4.7 +0.9/-0.6 mm yr-1 of slip. Summing these slip rates with known rates on the Owens Valley, Hunter Mountain, and Stateline faults at similar latitudes suggests a total geologic slip rate across the northern ECSZ of ???8.5 to 10 mm yr-1. This rate is commensurate with the overall geodetic rate and implies that the apparent discrepancy between geologic and geodetic data observed in the Mojave section of the ECSZ does not extend north of the Garlock fault. Although the overall geodetic rates are similar, the best estimates based on geology predict higher strain rates in the eastern part of the ECSZ than to the west, whereas the observed geodetic strain is relatively constant. Copyright 2007 by the American Geophysical Union.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Geophysical Research B: Solid Earth","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1029/2006JB004350","issn":"01480227","usgsCitation":"Frankel, K., Brantley, K., Dolan, J., Finkel, R., Klinger, R., Knott, J., Machette, M.N., Owen, L., Phillips, F.M., Slate, J.L., and Wernicke, B., 2007, Cosmogenic 10Be and 36Cl geochronology of offset alluvial fans along the northern Death Valley fault zone: Implications for transient strain in the eastern California shear zone: Journal of Geophysical Research B: Solid Earth, v. 112, no. 6, https://doi.org/10.1029/2006JB004350.","costCenters":[],"links":[{"id":476955,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2006jb004350","text":"Publisher Index Page"},{"id":212823,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1029/2006JB004350"},{"id":240370,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"112","issue":"6","noUsgsAuthors":false,"publicationDate":"2007-06-13","publicationStatus":"PW","scienceBaseUri":"5059fc5fe4b0c8380cd4e25c","contributors":{"authors":[{"text":"Frankel, K.L.","contributorId":17050,"corporation":false,"usgs":true,"family":"Frankel","given":"K.L.","email":"","affiliations":[],"preferred":false,"id":425872,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Brantley, K.S.","contributorId":9070,"corporation":false,"usgs":true,"family":"Brantley","given":"K.S.","email":"","affiliations":[],"preferred":false,"id":425870,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Dolan, J.F.","contributorId":64813,"corporation":false,"usgs":true,"family":"Dolan","given":"J.F.","email":"","affiliations":[],"preferred":false,"id":425876,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Finkel, R.C.","contributorId":79677,"corporation":false,"usgs":true,"family":"Finkel","given":"R.C.","email":"","affiliations":[],"preferred":false,"id":425878,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Klinger, R.E.","contributorId":13807,"corporation":false,"usgs":true,"family":"Klinger","given":"R.E.","email":"","affiliations":[],"preferred":false,"id":425871,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Knott, J.R.","contributorId":26847,"corporation":false,"usgs":true,"family":"Knott","given":"J.R.","affiliations":[],"preferred":false,"id":425875,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Machette, M. N.","contributorId":19561,"corporation":false,"usgs":true,"family":"Machette","given":"M.","email":"","middleInitial":"N.","affiliations":[],"preferred":false,"id":425873,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Owen, L.A.","contributorId":94836,"corporation":false,"usgs":true,"family":"Owen","given":"L.A.","email":"","affiliations":[],"preferred":false,"id":425879,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Phillips, F. M.","contributorId":24493,"corporation":false,"usgs":true,"family":"Phillips","given":"F.","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":425874,"contributorType":{"id":1,"text":"Authors"},"rank":9},{"text":"Slate, J. L.","contributorId":97039,"corporation":false,"usgs":true,"family":"Slate","given":"J.","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":425880,"contributorType":{"id":1,"text":"Authors"},"rank":10},{"text":"Wernicke, B.P.","contributorId":74957,"corporation":false,"usgs":true,"family":"Wernicke","given":"B.P.","email":"","affiliations":[],"preferred":false,"id":425877,"contributorType":{"id":1,"text":"Authors"},"rank":11}]}} ,{"id":70030065,"text":"70030065 - 2007 - Sea level fluctuations in central California at subtidal to decadal and longer time scales with implications for San Francisco Bay, California","interactions":[],"lastModifiedDate":"2023-08-02T12:16:40.648602","indexId":"70030065","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1587,"text":"Estuarine, Coastal and Shelf Science","active":true,"publicationSubtype":{"id":10}},"title":"Sea level fluctuations in central California at subtidal to decadal and longer time scales with implications for San Francisco Bay, California","docAbstract":"Sea level elevations from near the mouth of San Francisco Bay are used to describe the low-frequency variability of forcing of the coastal ocean on the Bay at a variety of temporal scales. About 90% of subtidal fluctuations in sea level in San Francisco Bay are driven by the sea level variations in the coastal ocean that propagate into the Bay at the estuary mouth. We use the 100-year sea level record available at San Francisco to document a 1.9 mm/yr mean sea level rise, and to determine fluctuations related to El Nino-Southern Oscillation (ENSO) and other climatic events. At time scales greater than 1 year, ENSO dominates the sea level signal and can result in fluctuations in sea level of 10–15 cm. Alongshore wind stress data from central California are also analyzed to determine the impact of changes in coastal elevation at the mouth of San Francisco Bay within the synoptic wind band of 2–30 days. At least 40% of the subtidal fluctuations in sea level of the Bay are tied to the large-scale regional wind field affecting sea level variations in the coastal ocean, with little local, direct wind forcing of the Bay itself. The majority of the subtidal sea level fluctuations within the Bay that are not related to the coastal ocean sea level signal are forced by an east–west sea level gradient resulting from tidally induced variations in sea level at specific beat frequencies that are enhanced in the northern reach of the Bay. River discharge into the Bay through the Sacramento and San Joaquin River Delta also contributes to the east–west gradient, but to a lesser degree.
Advanced borehole-geophysical methods were used to assess the geohydrology of fractured crystalline bedrock in 31 of 64 boreholes on the southern part of Manhattan Island, NY in preparation of the construction of a new water tunnel. The study area is located in a highly urbanized part of New York City. The boreholes penetrated gneiss, schist, and other crystalline bedrock that has an overall southwest-to northwest-dipping foliation. Most of the fractures intersected are nearly horizontal or have moderate- to high-angle northwest or eastward dip azimuths. Heat-pulse flowmeter logs obtained under nonpumping (ambient) and pumping conditions, together with other geophysical logs, delineated transmissive fracture zones in each borehole. Water-level and flowmeter data suggest the fractured-rock ground-water-flow system is interconnected. The 60 MHz directional borehole-radar logs delineated the location and orientation of several radar reflectors that did not intersect the projection of the borehole. A total of 53 faults intersected by the boreholes have mean orientation populations of N12°W, 66°W and N11°W, 70°E. A total of 77 transmissive fractures delineated using the heat-pulse flowmeter have mean orientations of N11°E, 14°SE (majority) and N23°E, 57°NW (minority). The transmissivity of the bedrock boreholes ranged from 0.7 to 870 feet squared (ft2) per day (0.07 to 81 metres squared (m2) per day).
","language":"English","publisher":"Oxford Academic","doi":"10.1088/1742-2132/4/3/S02","issn":"17422132","usgsCitation":"Stumm, F., Chu, A., Joesten, P., and Lane, J., 2007, Geohydrologic assessment of fractured crystalline bedrock on the southern part of Manhattan, New York, through the use of advanced borehole geophysical methods: Journal of Geophysics and Engineering, v. 4, no. 3, p. 245-252, https://doi.org/10.1088/1742-2132/4/3/S02.","productDescription":"8 p.","startPage":"245","endPage":"252","numberOfPages":"8","costCenters":[{"id":493,"text":"Office of Ground Water","active":true,"usgs":true}],"links":[{"id":240627,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"New York","city":"Manhattan","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -74.02450561523438,\n 40.69938133866613\n ],\n [\n -73.93386840820312,\n 40.69938133866613\n ],\n [\n -73.93386840820312,\n 40.79977641109269\n ],\n [\n -74.02450561523438,\n 40.79977641109269\n ],\n [\n -74.02450561523438,\n 40.69938133866613\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"4","issue":"3","noUsgsAuthors":false,"publicationDate":"2007-08-31","publicationStatus":"PW","scienceBaseUri":"505a17a0e4b0c8380cd55578","contributors":{"authors":[{"text":"Stumm, F.","contributorId":33928,"corporation":false,"usgs":true,"family":"Stumm","given":"F.","email":"","affiliations":[],"preferred":false,"id":425382,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Chu, A.","contributorId":81697,"corporation":false,"usgs":true,"family":"Chu","given":"A.","email":"","affiliations":[],"preferred":false,"id":425385,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Joesten, P. K.","contributorId":62818,"corporation":false,"usgs":true,"family":"Joesten","given":"P. K.","affiliations":[],"preferred":false,"id":425383,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Lane, J.W. Jr.","contributorId":66723,"corporation":false,"usgs":true,"family":"Lane","given":"J.W.","suffix":"Jr.","email":"","affiliations":[],"preferred":false,"id":425384,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70029869,"text":"70029869 - 2007 - Fault locking, block rotation and crustal deformation in the Pacific Northwest","interactions":[],"lastModifiedDate":"2023-08-08T11:15:21.252841","indexId":"70029869","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1803,"text":"Geophysical Journal International","active":true,"publicationSubtype":{"id":10}},"title":"Fault locking, block rotation and crustal deformation in the Pacific Northwest","docAbstract":"We interpret Global Positioning System (GPS) measurements in the northwestern United States and adjacent parts of western Canada to describe relative motions of crustal blocks, locking on faults and permanent deformation associated with convergence between the Juan de Fuca and North American plates. To estimate angular velocities of the oceanic Juan de Fuca and Explorer plates and several continental crustal blocks, we invert the GPS velocities together with seafloor spreading rates, earthquake slip vector azimuths and fault slip azimuths and rates. We also determine the degree to which faults are either creeping aseismically or, alternatively, locked on the block-bounding faults. The Cascadia subduction thrust is locked mainly offshore, except in central Oregon, where locking extends inland. Most of Oregon and southwest Washington rotate clockwise relative to North America at rates of 0.4–1.0 ° Myr−1. No shear or extension along the Cascades volcanic arc has occurred at the mm/yr level during the past decade, suggesting that the shear deformation extending northward from the Walker Lane and eastern California shear zone south of Oregon is largely accommodated by block rotation in Oregon. The general agreement of vertical axis rotation rates derived from GPS velocities with those estimated from palaeomagnetic declination anomalies suggests that the rotations have been relatively steady for 10–15 Ma. Additional permanent dextral shear is indicated within the Oregon Coast Range near the coast. Block rotations in the Pacific Northwest do not result in net westward flux of crustal material—the crust is simply spinning and not escaping. On Vancouver Island, where the convergence obliquity is less than in Oregon and Washington, the contractional strain at the coast is more aligned with Juan de Fuca—North America motion. GPS velocities are fit significantly better when Vancouver Island and the southern Coast Mountains move relative to North America in a block-like fashion. The relative motions of the Oregon, western Washington and Vancouver Island crustal blocks indicate that the rate of permanent shortening, the type that causes upper plate earthquakes, across the Puget Sound region is 4.4 ± 0.3 mm yr−1. This shortening is likely distributed over several faults but GPS data alone cannot determine the partitioning of slip on them. The transition from predominantly shear deformation within the continent south of the Mendocino Triple Junction to predominantly block rotations north of it is similar to changes in tectonic style at other transitions from shear to subduction. This similarity suggests that crustal block rotations are enhanced in the vicinity of subduction zones possibly due to lower resisting stress.
","language":"English","publisher":"Oxford Academic","doi":"10.1111/j.1365-246X.2007.03371.x","issn":"0956540X","usgsCitation":"McCaffrey, R., Qamar, A.I., King, R.W., Wells, R., Khazaradze, G., Williams, C., Stevens, C., Vollick, J., and Zwick, P., 2007, Fault locking, block rotation and crustal deformation in the Pacific Northwest: Geophysical Journal International, v. 169, no. 3, p. 1315-1340, https://doi.org/10.1111/j.1365-246X.2007.03371.x.","productDescription":"26 p.","startPage":"1315","endPage":"1340","costCenters":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"links":[{"id":477093,"rank":2,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1111/j.1365-246x.2007.03371.x","text":"Publisher Index Page"},{"id":240282,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Canada, United States","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -132.94757354974377,\n 54.16450334041414\n ],\n [\n -132.94757354974377,\n 41.41857486539368\n ],\n [\n -119.55000150300604,\n 41.41857486539368\n ],\n [\n -119.55000150300604,\n 54.16450334041414\n ],\n [\n -132.94757354974377,\n 54.16450334041414\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","volume":"169","issue":"3","noUsgsAuthors":false,"publicationDate":"2007-06-01","publicationStatus":"PW","scienceBaseUri":"505a0f19e4b0c8380cd53778","contributors":{"authors":[{"text":"McCaffrey, Robert","contributorId":51207,"corporation":false,"usgs":true,"family":"McCaffrey","given":"Robert","affiliations":[],"preferred":false,"id":424661,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Qamar, Anthony I.","contributorId":69040,"corporation":false,"usgs":true,"family":"Qamar","given":"Anthony","email":"","middleInitial":"I.","affiliations":[],"preferred":false,"id":424659,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"King, Robert W.","contributorId":189079,"corporation":false,"usgs":false,"family":"King","given":"Robert","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":424665,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Wells, Ray E. 0000-0002-7796-0160 rwells@usgs.gov","orcid":"https://orcid.org/0000-0002-7796-0160","contributorId":2692,"corporation":false,"usgs":true,"family":"Wells","given":"Ray E.","email":"rwells@usgs.gov","affiliations":[{"id":312,"text":"Geology, Minerals, Energy, and Geophysics Science Center","active":true,"usgs":true}],"preferred":false,"id":424662,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Khazaradze, G.","contributorId":84164,"corporation":false,"usgs":true,"family":"Khazaradze","given":"G.","email":"","affiliations":[],"preferred":false,"id":424664,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Williams, C.A.","contributorId":79571,"corporation":false,"usgs":true,"family":"Williams","given":"C.A.","email":"","affiliations":[],"preferred":false,"id":424663,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Stevens, C.W.","contributorId":97322,"corporation":false,"usgs":true,"family":"Stevens","given":"C.W.","email":"","affiliations":[],"preferred":false,"id":424666,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Vollick, J.J.","contributorId":18179,"corporation":false,"usgs":true,"family":"Vollick","given":"J.J.","email":"","affiliations":[],"preferred":false,"id":424660,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Zwick, P.C.","contributorId":107933,"corporation":false,"usgs":true,"family":"Zwick","given":"P.C.","email":"","affiliations":[],"preferred":false,"id":424667,"contributorType":{"id":1,"text":"Authors"},"rank":9}]}} ,{"id":70042858,"text":"cir13065D - 2007 - Impacts of Hurricane Rita on the beaches of western Louisiana","interactions":[],"lastModifiedDate":"2019-06-18T12:06:49","indexId":"cir13065D","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":307,"text":"Circular","code":"CIR","onlineIssn":"2330-5703","printIssn":"1067-084X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"1306","chapter":"5D","title":"Impacts of Hurricane Rita on the beaches of western Louisiana","docAbstract":"Hurricane Rita made landfall as a category 3 storm in western Louisiana in late September 2005, 1 month following Hurricane Katrina's devastating landfall in the eastern part of the State. Large waves and storm surge inundated the lowelevation coastline, destroying many communities and causing extensive coastal change including beach, dune, and marsh erosion.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Science and the storms-the USGS response to the hurricanes of 2005 (Circular 1306)","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/cir13065D","collaboration":"This report is Chapter 5D in Science and the storms-the USGS response to the hurricanes of 2005. See Circular 1306 for more information and other chapters.","usgsCitation":"Stockdon, H.F., Fauver, L.A., Sallenger, and Wright, C.W., 2007, Impacts of Hurricane Rita on the beaches of western Louisiana: U.S. Geological Survey Circular 1306, 5 p., https://doi.org/10.3133/cir13065D.","productDescription":"5 p.","startPage":"119","endPage":"123","numberOfPages":"5","costCenters":[{"id":455,"text":"National Wetlands Research Center","active":true,"usgs":true},{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true}],"links":[{"id":266496,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/cir_1306_5d.jpg"},{"id":266494,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/circ/1306/"},{"id":266495,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/circ/1306/pdf/c1306_ch5_d.pdf"}],"country":"United States","state":"Louisiana","geographicExtents":"{ \"type\": \"FeatureCollection\", \"features\": [ { \"type\": \"Feature\", \"properties\": {}, \"geometry\": { \"type\": \"Polygon\", \"coordinates\": [ [ [ -95,5.555555555555556E-4 ], [ -95,8.333333333333334E-4 ], [ -92,8.333333333333334E-4 ], [ -92,5.555555555555556E-4 ], [ -95,5.555555555555556E-4 ] ] ] } } ] }","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5103b789e4b0ce88de640a19","contributors":{"authors":[{"text":"Stockdon, Hilary F. 0000-0003-0791-4676 hstockdon@usgs.gov","orcid":"https://orcid.org/0000-0003-0791-4676","contributorId":2153,"corporation":false,"usgs":true,"family":"Stockdon","given":"Hilary","email":"hstockdon@usgs.gov","middleInitial":"F.","affiliations":[{"id":574,"text":"St. Petersburg Coastal and Marine Science Center","active":true,"usgs":true},{"id":186,"text":"Coastal and Marine Geology Program","active":true,"usgs":true}],"preferred":true,"id":472412,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Fauver, Laura A.","contributorId":105384,"corporation":false,"usgs":true,"family":"Fauver","given":"Laura","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":472414,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Sallenger, Jr.","contributorId":105768,"corporation":false,"usgs":true,"family":"Sallenger","suffix":"Jr.","email":"","affiliations":[],"preferred":false,"id":472415,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Wright, C. Wayne wwright@usgs.gov","contributorId":57422,"corporation":false,"usgs":true,"family":"Wright","given":"C.","email":"wwright@usgs.gov","middleInitial":"Wayne","affiliations":[],"preferred":false,"id":472413,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70042540,"text":"cir13062A - 2007 - Cycles of hurricane landfalls on the eastern United States linked to changes in Atlantic sea-surface temperatures","interactions":[],"lastModifiedDate":"2022-11-22T14:19:58.160221","indexId":"cir13062A","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":18,"text":"Report"},"publicationSubtype":{"id":5,"text":"USGS Numbered Series"},"seriesTitle":{"id":307,"text":"Circular","code":"CIR","onlineIssn":"2330-5703","printIssn":"1067-084X","active":true,"publicationSubtype":{"id":5}},"seriesNumber":"1306","chapter":"2A","title":"Cycles of hurricane landfalls on the eastern United States linked to changes in Atlantic sea-surface temperatures","docAbstract":"The occurrence of hurricane landfalls on the United States may be related to alternating intervals of persistent above-average and below-average surface temperature of the North Atlantic Ocean. The cycle of temperature variations, known as the Atlantic Multidecadal Oscillation (AMO), has been identified by study of records based on thermometer readings that go back to the late 1800s. These records do not cover a large enough span of time to adequately test the stability and persistence of the AMO. Better understanding of the AMO and its possible link to hurricane landfalls requires extending our knowledge of the ocean-surface temperature to periods before these thermometer readings were recorded.","largerWorkType":{"id":18,"text":"Report"},"largerWorkTitle":"Science and the storms: The USGS response to the hurricanes of 2005 (Circular 1306)","largerWorkSubtype":{"id":5,"text":"USGS Numbered Series"},"language":"English","publisher":"U.S. Geological Survey","publisherLocation":"Reston, VA","doi":"10.3133/cir13062A","collaboration":"This report is Chapter 2A in Science and the storms-the USGS response to the hurricanes of 2005. See Circular 1306 for more information and other chapters.","usgsCitation":"Poore, R.Z., Quinn, T., Richey, J., and Smith, J., 2007, Cycles of hurricane landfalls on the eastern United States linked to changes in Atlantic sea-surface temperatures: U.S. Geological Survey Circular 1306, 6 p., https://doi.org/10.3133/cir13062A.","productDescription":"6 p.","startPage":"6","endPage":"11","numberOfPages":"6","costCenters":[{"id":455,"text":"National Wetlands Research Center","active":true,"usgs":true},{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true}],"links":[{"id":265711,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/usgs_thumb.jpg"},{"id":265710,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.usgs.gov/circ/1306/","linkFileType":{"id":5,"text":"html"}},{"id":265709,"type":{"id":11,"text":"Document"},"url":"https://pubs.usgs.gov/circ/1306/pdf/c1306_ch2_a.pdf","linkFileType":{"id":1,"text":"pdf"}}],"country":"United States","state":"Connecticut, Delaware, Florida, Georgia, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, North Carolina, Rhode Island, South Carolina, Virginia","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"coordinates\": [\n [\n [\n -62.1345176107085,\n 47.93101922569454\n ],\n [\n -84.27765253077635,\n 47.93101922569454\n ],\n [\n -84.27765253077635,\n 24.70467892203486\n ],\n [\n -62.1345176107085,\n 24.70467892203486\n ],\n [\n -62.1345176107085,\n 47.93101922569454\n ]\n ]\n ],\n \"type\": \"Polygon\"\n }\n }\n ]\n}","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"50f68884e4b0f5392eb7e78c","contributors":{"authors":[{"text":"Poore, Richard Z. rpoore@usgs.gov","contributorId":345,"corporation":false,"usgs":true,"family":"Poore","given":"Richard","email":"rpoore@usgs.gov","middleInitial":"Z.","affiliations":[{"id":574,"text":"St. Petersburg Coastal and Marine Science Center","active":true,"usgs":true}],"preferred":false,"id":471751,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Quinn, Terry","contributorId":18247,"corporation":false,"usgs":true,"family":"Quinn","given":"Terry","email":"","affiliations":[],"preferred":false,"id":471752,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Richey, Julie","contributorId":92144,"corporation":false,"usgs":true,"family":"Richey","given":"Julie","affiliations":[],"preferred":false,"id":471753,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Smith, Jackie L.","contributorId":105017,"corporation":false,"usgs":true,"family":"Smith","given":"Jackie L.","affiliations":[],"preferred":false,"id":471754,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70010311,"text":"70010311 - 2007 - Pattern and potential causes of White-faced Ibis, Plegadis chihi, establishment in the northern prairie and parkland region of North America","interactions":[],"lastModifiedDate":"2022-08-15T19:06:39.905962","indexId":"70010311","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}},"title":"Pattern and potential causes of White-faced Ibis, Plegadis chihi, establishment in the northern prairie and parkland region of North America","docAbstract":"The Northern Prairie and Parkland Waterbird Conservation Plan calls for renewed attention to determining the current status of waterbird populations, their distributions, and conservation needs. It highlights the need for baseline information on the White-faced Ibis (Plegadis chihi). In response, we examined the historical and current distribution of the ibis in North Dakota and summarized first sightings and nest records for the provinces and other states composing the northern prairie and parkland region. The establishment of breeding colonies of White-faced Ibis here may be due to climate and precipitation patterns, invasion and spread of Narrowleaf Cattail (Typha angustifolia), changes in agricultural practices, habitat loss and range expansion in the southern and western portions of the species' range, and increases in ibis populations in the Intermountain West. We placed special emphasis on North Dakota, a state for which there is scant published information concerning the current status of this species. In recent decades, the ibis has become a regular breeding-season resident in North Dakota and in other areas of the northern prairie and parkland region. From 1882 to 2002, there were 145 reports of one or more White-faced Ibis in North Dakota, including 93 reports during the breeding season (15 May to 31 August), 49 during the non-breeding season (1 September to 14 May), and three for which the season of occurrence was not reported. Prior to the 1960s, there were only three records of the species in North Dakota. Observations of White-faced Ibises in North Dakota increased dramatically between the 1960s and the early 21st century, and the species has been observed nearly annually since 1971. The first White-faced Ibis nesting activity in the state was recorded in 1978, and to date, there have been 21 known records of nesting activity in the state. The species nested in large (>300 ha) semipermanent or permanent wetlands within mixed-species colonies ranging in areal extent from small (0.1 ha) to fairly large (27 ha), and colonies were located in patches of emergent vegetation dominated by cattails (Typha) and bulrushes (Scirpus). We classify the White-faced Ibis as a fairly common migrant and a locally uncommon breeder east of the Missouri River and a casual migrant west of the Missouri River.","language":"English","publisher":"Canadian Field-Naturalist","doi":"10.22621/cfn.v121i1.392","usgsCitation":"Shaffer, J.A., Knutsen, G.A., Martin, R.E., and Brice, J.S., 2007, Pattern and potential causes of White-faced Ibis, Plegadis chihi, establishment in the northern prairie and parkland region of North America: Canadian Field-Naturalist, v. 121, no. 1, p. 46-56, https://doi.org/10.22621/cfn.v121i1.392.","productDescription":"11 p.","startPage":"46","endPage":"56","costCenters":[{"id":480,"text":"Northern Prairie Wildlife Research Center","active":true,"usgs":true}],"links":[{"id":490005,"rank":1,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.22621/cfn.v121i1.392","text":"Publisher Index Page"},{"id":219605,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"121","issue":"1","noUsgsAuthors":false,"publicationDate":"2007-01-01","publicationStatus":"PW","scienceBaseUri":"505a75b1e4b0c8380cd77cad","contributors":{"authors":[{"text":"Shaffer, Jill A. 0000-0003-3172-0708 jshaffer@usgs.gov","orcid":"https://orcid.org/0000-0003-3172-0708","contributorId":3184,"corporation":false,"usgs":true,"family":"Shaffer","given":"Jill","email":"jshaffer@usgs.gov","middleInitial":"A.","affiliations":[{"id":480,"text":"Northern Prairie Wildlife Research Center","active":true,"usgs":true}],"preferred":true,"id":358600,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Knutsen, Gregory A.","contributorId":35247,"corporation":false,"usgs":true,"family":"Knutsen","given":"Gregory","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":358601,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Martin, Ron E.","contributorId":295244,"corporation":false,"usgs":false,"family":"Martin","given":"Ron","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":358598,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Brice, Joel S.","contributorId":295245,"corporation":false,"usgs":false,"family":"Brice","given":"Joel","email":"","middleInitial":"S.","affiliations":[{"id":61786,"text":"Delta Waterfowl Foundation","active":true,"usgs":false}],"preferred":false,"id":358599,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70029758,"text":"70029758 - 2007 - Detrital mineral chronology of the Uinta Mountain Group: Implications for the Grenville flood in southwestern Laurentia","interactions":[],"lastModifiedDate":"2023-08-24T11:15:23.352501","indexId":"70029758","displayToPublicDate":"2007-01-01T00:00:00","publicationYear":"2007","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1796,"text":"Geology","active":true,"publicationSubtype":{"id":10}},"title":"Detrital mineral chronology of the Uinta Mountain Group: Implications for the Grenville flood in southwestern Laurentia","docAbstract":"Numerous studies have shown that large quantities of Grenville-age detritus dominate Neoproterozoic to Cambrian arenites in southwest Laurentia (southwestern United States). U-Pb ages and Hf isotopic compositions of zircons and 40Ar/39Ar ages of white mica from clastic sedimentary rocks of the Neoproterozoic Uinta Mountain Group also indicate significant Mesoproterozoic detritus mixed with a variably abundant Archean component. Zircons with ages representative of the Paleoproterozoic basement in the eastern Uinta Mountains or the younger Paleoproterozoic rocks of the adjacent Yavapai-Mazatzal terranes were not observed. A limited range of initial ϵHf (∼90% between –3 and +3) for Mesoproterozoic zircons suggests derivation from a source region (or regions) characterized by mixing between juvenile and reworked older crust during Grenville orogenesis. The enriched Grenville-age basement proposed to underlie much of southeastern North America may be this source based on similarities of Hf isotopic data from Mesoproterozoic zircons in Mississippi River sand and available paleocurrent data. If so, then disruption of this supply in the Cambrian may be related to Iapetan rifting and, perhaps, the separation of the Precordillera terrane from Laurentia.
The White River altered area, Washington, and the Goldfield mining district, Nevada, are nearly contemporaneous Tertiary (ca. 20 Ma) calc-alkaline igneous centers with large exposures of shallow (<1 km depth) magmatic-hydrothermal, acid-sulfate alteration. Goldfield is the largest known high-sulfidation gold deposit in North America. At White River, silica is the only commodity exploited to date, but, based on its similarities with Goldfield, White River may have potential for concealed precious and/or base metal deposits at shallow depth. Both areas are products of the ancestral Cascade arc. Goldfield lies within the Great Basin physiographic province in an area of middle Miocene and younger Basin and Range and Walker Lane faulting, whereas White River is largely unaffected by young faults. However, west-northwest–striking magnetic anomalies at White River do correspond with mapped faults synchronous with magmatism, and other linear anomalies may reflect contemporaneous concealed faults. The White River altered area lies immediately south of the west-northwest–striking White River fault zone and north of a postulated fault with similar orientation. Structural data from the White River altered area indicate that alteration developed synchronously with an anomalous stress field conducive to left-lateral, strike-slip displacement on west-northwest–striking faults. Thus, the White River alteration may have developed in a transient transtensional region between the two strike-slip faults, analogous to models proposed for Goldfield and other mineral deposits in transverse deformational zones. Gravity and magnetic anomalies provide evidence for a pluton beneath the White River altered area that may have provided heat and fluids to overlying volcanic rocks. East– to east-northeast–striking extensional faults and/or fracture zones in the step-over region, also expressed in magnetic anomalies, may have tapped this intrusion and provided vertical and lateral transport of fluids to now silicified areas. By analogy to Goldfield, geophysical anomalies at the White River altered area may serve as proxies for geologic mapping in identifying faults, fractures, and intrusions relevant to hydrothermal alteration and ore formation in areas of poor exposure.
We analyzed data from two surveys of fall migrating shorebirds in central and eastern North America to estimate annual trends in means per survey and to determine whether trends indicate a change in population size or might have been caused by other factors. The analysis showed a broad decline in means per survey in Atlantic Canada and the northeastern United States (North Atlantic region). For example, 9 of 9 significant trends in this region were <1 (P=0.004), and the mean, annual rate of change among 30 species was 0.9783, a decline of −2.17% per year (P<0.001). Trends in the midwestern United States (Midwest region) showed no clear pattern. The mean among 29 species was 1.0090 (P=0.35). Only 4 of the trends were significant. Several hypotheses were evaluated to identify causes of the declining means per survey in the North Atlantic region. The most likely hypothesis appears to be a decline in the breeding populations that supply migrants to the North Atlantic region, but a change in movements, for example passing through the region more quickly in recent years, cannot be excluded as an explanation. Further surveys of arctic breeding areas coupled with analysis of long‐term survey data from western North America would be helpful in determining whether the declines found in this analysis are also occurring in other areas.
","language":"English","publisher":"WIley","doi":"10.1111/j.2007.0908-8857.03698.x","usgsCitation":"Bart, J., Brown, S., Harrington, B.A., and Morrison, R., 2007, Survey trends of North American shorebirds: Population declines or shifting distributions?: Journal of Avian Biology, v. 38, no. 1, p. 73-82, https://doi.org/10.1111/j.2007.0908-8857.03698.x.","productDescription":"10 p.","startPage":"73","endPage":"82","costCenters":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"links":[{"id":242531,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"38","issue":"1","noUsgsAuthors":false,"publicationDate":"2007-01-25","publicationStatus":"PW","scienceBaseUri":"505ba2a0e4b08c986b31f839","contributors":{"authors":[{"text":"Bart, Jonathan jon_bart@usgs.gov","contributorId":57025,"corporation":false,"usgs":true,"family":"Bart","given":"Jonathan","email":"jon_bart@usgs.gov","affiliations":[{"id":290,"text":"Forest and Rangeland Ecosystem Science Center","active":false,"usgs":true}],"preferred":false,"id":434335,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Brown, Stephen","contributorId":40096,"corporation":false,"usgs":true,"family":"Brown","given":"Stephen","affiliations":[],"preferred":false,"id":434336,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Harrington, Brian A.","contributorId":58989,"corporation":false,"usgs":true,"family":"Harrington","given":"Brian","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":434333,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Morrison, R.I. Guy","contributorId":52003,"corporation":false,"usgs":true,"family":"Morrison","given":"R.I. Guy","affiliations":[],"preferred":false,"id":434334,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70031406,"text":"70031406 - 2007 - Influence of groundwater pumping on streamflow restoration following upstream dam removal","interactions":[],"lastModifiedDate":"2023-07-21T11:15:19.852527","indexId":"70031406","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":"Influence of groundwater pumping on streamflow restoration following upstream dam removal","docAbstract":"We compared streamflow in basins under the combined impacts of an upland dam and groundwater pumping withdrawals, by examining streamflow in the presence and absence of each impact. As a qualitative analysis, inter-watershed streamflow comparisons were performed for several rivers flowing into the east side of the Central Valley, CA. Results suggest that, in the absence of upland dams supporting large reservoirs, some reaches of these rivers might develop ephemeral streamflow in late summer. As a quantitative analysis, we conducted a series of streamflow/groundwater simulations (using MODFLOW-2000 plus the streamflow routing package, SFR1) for a representative hypothetical watershed, with an upland dam and groundwater pumping in the downstream basin, under humid, semi-arid, and arid conditions. As a result of including the impact of groundwater pumping, post-dam removal simulated streamflow was significantly less than natural streamflow. The model predicts extensive ephemeral conditions in the basin during September for both the arid and semi-arid cases. The model predicts continued perennial conditions in the humid case, but spatially weighted, average streamflow of only 71% of natural September streamflow, as a result of continued pumping after dam removal.