Microstegium vimineum (Japanese stilt grass) is an invasive grass in the eastern half of the United States which can form dense monocultures in forest understories, displacing native species. Although the loss of native species has been observed in the field, the actual competitive ability of this grass has not been examined. Microstegium vimineum was grown under controlled environment, greenhouse conditions in competition with Lolium perenne ssp. multiflorum (annual rye grass) and Muhlenbergia mexicana (Mexican muhly) in varying density ratios in full and low light treatments. Microstegium vimineum had a greater aboveground biomass, relative growth rate, and reproductive output than both competitors in both light treatments. The high competitive ability of Microstegium vimineum, especially in low light conditions, reflects its highly aggressive nature in forested or other landscapes of eastern North America.
","language":"English","publisher":"Torrey Botanical Society","doi":"10.3159/1095-5674(2005)132[573:ATCAOJ]2.0.CO;2","usgsCitation":"Leicht, S.A., Silander, J., and Greenwood, K., 2005, Assessing the competitive ability of Japanese stilt grass, Microstegium vimineum (Trin.) A. Camus: Journal of the Torrey Botanical Society, v. 132, no. 4, p. 573-580, https://doi.org/10.3159/1095-5674(2005)132[573:ATCAOJ]2.0.CO;2.","productDescription":"8 p.","startPage":"573","endPage":"580","numberOfPages":"8","costCenters":[],"links":[{"id":238476,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"132","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059ede7e4b0c8380cd49ab9","contributors":{"authors":[{"text":"Leicht, S. A.","contributorId":20951,"corporation":false,"usgs":false,"family":"Leicht","given":"S.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":415680,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Silander, J. A. Jr.","contributorId":20531,"corporation":false,"usgs":false,"family":"Silander","given":"J. A.","suffix":"Jr.","affiliations":[],"preferred":false,"id":415679,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Greenwood, K.","contributorId":26200,"corporation":false,"usgs":true,"family":"Greenwood","given":"K.","email":"","affiliations":[],"preferred":false,"id":415681,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70027879,"text":"70027879 - 2005 - Structure and variability of the Western Maine Coastal Current","interactions":[],"lastModifiedDate":"2017-10-04T13:18:09","indexId":"70027879","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1371,"text":"Deep-Sea Research Part II: Topical Studies in Oceanography","active":true,"publicationSubtype":{"id":10}},"title":"Structure and variability of the Western Maine Coastal Current","docAbstract":"Analyses of CTD and moored current meter data from 1998 and 2000 reveal a number of mechanisms influencing the flow along the western coast of Maine. On occasions, the Eastern Maine Coastal Current extends into the western Gulf of Maine where it takes the form of a deep (order 100 m deep) and broad (order 20 km wide) southwestward flow with geostrophic velocities exceeding 20 cm s -1. This is not a coastally trapped flow, however. In fields of geostrophic velocity, computed from shipboard-CTD data, the core of this current is roughly centered at the 100 m isobath and its onshore edge is no closer than 10 km from the coast. Geostrophic velocity fields also reveal a relatively shallow (order 10 m deep) baroclinic flow adjacent to the coast. This flow is also directed to the southwest and appears to be principally comprised of local river discharge. Analyses of moored current meter data reveal wind-driven modulations of the coastal flow that are consistent with expectations from simple theoretical models. However, a large fraction of the near-shore current variance does not appear to be directly related to wind forcing. Sea-surface temperature imagery, combined with analysis of the moored current meter data, suggests that eddies and meanders within the coastal flow may at times dominate the near-shore current variance. ?? 2005 Elsevier Ltd. All rights reserved.","language":"English","doi":"10.1016/j.dsr2.2005.06.019","issn":"09670645","usgsCitation":"Churchill, J., Pettigrew, N., and Signell, R.P., 2005, Structure and variability of the Western Maine Coastal Current: Deep-Sea Research Part II: Topical Studies in Oceanography, v. 52, no. 19-21, p. 2392-2410, https://doi.org/10.1016/j.dsr2.2005.06.019.","productDescription":"19 p.","startPage":"2392","endPage":"2410","costCenters":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":238361,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Maine","otherGeospatial":"Gulf of Maine","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -71.070556640625,\n 43.068887774169625\n ],\n [\n -66.5771484375,\n 43.068887774169625\n ],\n [\n -66.5771484375,\n 45.01141864227728\n ],\n [\n -71.070556640625,\n 45.01141864227728\n ],\n [\n -71.070556640625,\n 43.068887774169625\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"52","issue":"19-21","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b9c36e4b08c986b31d321","contributors":{"authors":[{"text":"Churchill, J.H.","contributorId":46687,"corporation":false,"usgs":true,"family":"Churchill","given":"J.H.","email":"","affiliations":[],"preferred":false,"id":415650,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Pettigrew, N.R.","contributorId":79285,"corporation":false,"usgs":true,"family":"Pettigrew","given":"N.R.","email":"","affiliations":[],"preferred":false,"id":415651,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Signell, R. P.","contributorId":89147,"corporation":false,"usgs":true,"family":"Signell","given":"R.","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":415652,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029047,"text":"70029047 - 2005 - Cultural change in the songs of humpback whales (Megaptera novaeangliae) from Tonga","interactions":[],"lastModifiedDate":"2012-03-12T17:21:00","indexId":"70029047","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":986,"text":"Behaviour","active":true,"publicationSubtype":{"id":10}},"title":"Cultural change in the songs of humpback whales (Megaptera novaeangliae) from Tonga","docAbstract":"Some humpback whales migrate annually from Antarctic feeding grounds to the seas around the Tongan Islands to give birth and mate. The Tongan humpbacks are considered part of Southern Hemisphere Group V that splits during migration, some swimming to Eastern Australia and others to various Polynesian Islands. During this time long complex songs are produced. The song is thought to be a male breeding display and may serve either as an intra-sexual or an inter-sexual signal or both. It is in a constant state of change that occurs every season. Since these changes are directional they cannot be described by drift, and singers incorporate changes as they occur, thus song must be shared through cultural transmission. This investigation describes the cultural changes that occurred in 158 songs recorded from Tongan humpbacks through the 1990s. The rate of change differed within years, some themes were retained for as much as five years and others were lost after only two years. The farther apart the years the less similar are the songs, as in the humpback songs of the Northern Hemisphere. The largest number of changes seems to have occurred in the early 1990s where all themes seemed to have been lost and new ones originated. What initiates these changes remains speculative, but we assess some hypotheses in relation to humpback whale behaviour and cultural transmission in avian song. ?? Koninklijke Brill NV, 2005.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Behaviour","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1163/1568539053778283","issn":"00057959","usgsCitation":"Eriksen, N., Miller, L., Tougaard, J., and Helweg, D., 2005, Cultural change in the songs of humpback whales (Megaptera novaeangliae) from Tonga: Behaviour, v. 142, no. 3, p. 305-328, https://doi.org/10.1163/1568539053778283.","startPage":"305","endPage":"328","numberOfPages":"24","costCenters":[],"links":[{"id":236357,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":209684,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1163/1568539053778283"}],"volume":"142","issue":"3","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"5059fd05e4b0c8380cd4e5ba","contributors":{"authors":[{"text":"Eriksen, N.","contributorId":91289,"corporation":false,"usgs":true,"family":"Eriksen","given":"N.","email":"","affiliations":[],"preferred":false,"id":421118,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Miller, L.A.","contributorId":39178,"corporation":false,"usgs":true,"family":"Miller","given":"L.A.","email":"","affiliations":[],"preferred":false,"id":421117,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Tougaard, J.","contributorId":92032,"corporation":false,"usgs":true,"family":"Tougaard","given":"J.","email":"","affiliations":[],"preferred":false,"id":421119,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Helweg, D.A.","contributorId":107072,"corporation":false,"usgs":true,"family":"Helweg","given":"D.A.","affiliations":[],"preferred":false,"id":421120,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70027867,"text":"70027867 - 2005 - The Pinto shear zone; a Laramide synconvergent extensional shear zone in the Mojave Desert region of the southwestern United States","interactions":[],"lastModifiedDate":"2012-03-12T17:20:45","indexId":"70027867","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2468,"text":"Journal of Structural Geology","active":true,"publicationSubtype":{"id":10}},"title":"The Pinto shear zone; a Laramide synconvergent extensional shear zone in the Mojave Desert region of the southwestern United States","docAbstract":"The Pinto shear zone is one of several Late Cretaceous shear zones within the eastern fringe of the Mesozoic magmatic arc of the southwest Cordilleran orogen that developed synchronous with continued plate convergence and backarc shortening. We demonstrate an extensional origin for the shear zone by describing the shear-zone geometry and kinematics, hanging wall deformation style, progressive changes in deformation temperature, and differences in hanging wall and footwall thermal histories. Deformation is constrained between ???74 and 68 Ma by 40Ar/39Ar thermochronology of the exhumed footwall, including multi-diffusion domain modeling of K-feldspar. We discount the interpretations, applied in other areas of the Mojave Desert region, that widespread Late Cretaceous cooling results from refrigeration due to subduction of a shallowly dipping Laramide slab or to erosional denudation, and suggest alternatively that post-intrusion cooling and exhumation by extensional structures are recorded. Widespread crustal melting and magmatism followed by extension and cooling in the Late Cretaceous are most consistent with production of a low-viscosity lower crust during anatexis and/or delamination of mantle lithosphere at the onset of Laramide shallow subduction. ?? 2005 Elsevier Ltd. All rights reserved.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Structural Geology","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1016/j.jsg.2005.03.005","issn":"01918141","usgsCitation":"Wells, M., Beyene, M., Spell, T., Kula, J., Miller, D., and Zanetti, K., 2005, The Pinto shear zone; a Laramide synconvergent extensional shear zone in the Mojave Desert region of the southwestern United States: Journal of Structural Geology, v. 27, no. 9, p. 1697-1720, https://doi.org/10.1016/j.jsg.2005.03.005.","startPage":"1697","endPage":"1720","numberOfPages":"24","costCenters":[],"links":[{"id":211012,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.jsg.2005.03.005"},{"id":238147,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"27","issue":"9","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505ba888e4b08c986b321cbe","contributors":{"authors":[{"text":"Wells, M.L.","contributorId":6655,"corporation":false,"usgs":true,"family":"Wells","given":"M.L.","email":"","affiliations":[],"preferred":false,"id":415605,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Beyene, M.A.","contributorId":33520,"corporation":false,"usgs":true,"family":"Beyene","given":"M.A.","email":"","affiliations":[],"preferred":false,"id":415606,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Spell, T.L.","contributorId":43968,"corporation":false,"usgs":true,"family":"Spell","given":"T.L.","email":"","affiliations":[],"preferred":false,"id":415607,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Kula, J.L.","contributorId":95674,"corporation":false,"usgs":true,"family":"Kula","given":"J.L.","email":"","affiliations":[],"preferred":false,"id":415609,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Miller, D. M. 0000-0003-3711-0441","orcid":"https://orcid.org/0000-0003-3711-0441","contributorId":104422,"corporation":false,"usgs":true,"family":"Miller","given":"D. M.","affiliations":[],"preferred":false,"id":415610,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Zanetti, K.A.","contributorId":46757,"corporation":false,"usgs":true,"family":"Zanetti","given":"K.A.","email":"","affiliations":[],"preferred":false,"id":415608,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70027860,"text":"70027860 - 2005 - The kinematic and hydrographic structure of the Gulf of Maine Coastal Current","interactions":[],"lastModifiedDate":"2017-10-04T15:54:08","indexId":"70027860","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1371,"text":"Deep-Sea Research Part II: Topical Studies in Oceanography","active":true,"publicationSubtype":{"id":10}},"title":"The kinematic and hydrographic structure of the Gulf of Maine Coastal Current","docAbstract":"The Gulf of Maine Coastal Current (GMCC), which extends from southern Nova Scotia to Cape Cod Massachusetts, was investigated from 1998 to 2001 by means of extensive hydrographic surveys, current meter moorings, tracked drifters, and satellite-derived thermal imagery. The study focused on two principal branches of the GMCC, the Eastern Maine Coastal Current (EMCC) that extends along the eastern coast of Maine to Penobscot Bay, and the Western Maine Coastal Current (WMCC) that extends westward from Penobscot Bay to Massachusetts Bay. Results confirm that GMCC is primarily a pressure gradient-driven system with both principal branches increasing their transport in the spring and summer due to fresh-water inflows, and flowing southwestward against the mean wind forcing during this period. In the spring and summer the subtidal surface currents in the EMCC range from 0.15 to 0.30 ms−1 while subtidal WMCC currents range from 0.05 to 0.15 ms−1. The reduction of southwestward transport near Penobscot Bay is accomplished via an offshore veering of a variable portion of the EMCC, some of which recirculates cyclonically within the eastern Gulf of Maine. The degree of summer offshore veering, versus leakage into the WMCC, varied strongly over the three study years, from nearly complete disruption in 1998 to nearly continuous through-flow in 2000. Observations show strong seasonal and interannual variability in both the strength of the GMCC and the degree of connectivity of its principal branches.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.dsr2.2005.06.033","issn":"09670645","usgsCitation":"Pettigrew, N., Churchill, J., Janzen, C., Mangum, L., Signell, R.P., Thomas, A., Townsend, D., Wallinga, J., and Xue, H., 2005, The kinematic and hydrographic structure of the Gulf of Maine Coastal Current: Deep-Sea Research Part II: Topical Studies in Oceanography, v. 52, no. 19-21, p. 2369-2391, https://doi.org/10.1016/j.dsr2.2005.06.033.","productDescription":"23 p.","startPage":"2369","endPage":"2391","costCenters":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":238002,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","otherGeospatial":"Gulf of Maine, Jordan Basin","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -71,\n 44.5\n ],\n [\n -65.5,\n 44.5\n ],\n [\n -65.5,\n 40\n ],\n [\n -71,\n 40\n ],\n [\n -71,\n 44.5\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"52","issue":"19-21","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bad74e4b08c986b323c0a","contributors":{"authors":[{"text":"Pettigrew, N.R.","contributorId":79285,"corporation":false,"usgs":true,"family":"Pettigrew","given":"N.R.","email":"","affiliations":[],"preferred":false,"id":415579,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Churchill, J.H.","contributorId":46687,"corporation":false,"usgs":true,"family":"Churchill","given":"J.H.","email":"","affiliations":[],"preferred":false,"id":415578,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Janzen, C.D.","contributorId":107490,"corporation":false,"usgs":true,"family":"Janzen","given":"C.D.","email":"","affiliations":[],"preferred":false,"id":415582,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Mangum, L.J.","contributorId":20537,"corporation":false,"usgs":true,"family":"Mangum","given":"L.J.","email":"","affiliations":[],"preferred":false,"id":415574,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Signell, R. P.","contributorId":89147,"corporation":false,"usgs":true,"family":"Signell","given":"R.","email":"","middleInitial":"P.","affiliations":[],"preferred":false,"id":415581,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Thomas, A.C.","contributorId":40797,"corporation":false,"usgs":true,"family":"Thomas","given":"A.C.","email":"","affiliations":[],"preferred":false,"id":415576,"contributorType":{"id":1,"text":"Authors"},"rank":6},{"text":"Townsend, D.W.","contributorId":42779,"corporation":false,"usgs":true,"family":"Townsend","given":"D.W.","email":"","affiliations":[],"preferred":false,"id":415577,"contributorType":{"id":1,"text":"Authors"},"rank":7},{"text":"Wallinga, J.P.","contributorId":21345,"corporation":false,"usgs":true,"family":"Wallinga","given":"J.P.","email":"","affiliations":[],"preferred":false,"id":415575,"contributorType":{"id":1,"text":"Authors"},"rank":8},{"text":"Xue, H.","contributorId":84148,"corporation":false,"usgs":true,"family":"Xue","given":"H.","affiliations":[],"preferred":false,"id":415580,"contributorType":{"id":1,"text":"Authors"},"rank":9}]}} ,{"id":70029053,"text":"70029053 - 2005 - U-Pb zircon ages and Pb isotope geochemistry of gold deposits in the Carolina slate belt of South Carolina","interactions":[],"lastModifiedDate":"2018-10-18T12:42:06","indexId":"70029053","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1472,"text":"Economic Geology","active":true,"publicationSubtype":{"id":10}},"title":"U-Pb zircon ages and Pb isotope geochemistry of gold deposits in the Carolina slate belt of South Carolina","docAbstract":"Volcanic rocks of the Persimmon Fork Formation host the largest known gold mines of the Carolina slate belt. U-Pb (SHRIMP) zircon ages have been obtained from rocks closely associated with pyrite-enargite-gold deposits at Brewer (quartz-topaz rhyolite breccia from the argillic alteration zone in the Brewer pit and felsic ash-flow tuff from the quartz sericite alteration zone), from the disseminated and semimassive pyrite-gold deposits at Haile (crystal lithic rhyolitic ash-flow tuffs from the Champion pit), and from the Ridgeway deposit (felsic ash-flow tuff from the stratigraphic host of the North pit gold deposit). Generally, the zircons are fine grained, fractured, and contain crystal imperfections (corrosion, inclusions, and pits). 206Pb/238U zircon spot ages for all deposits span a wide range, mostly from 400 to 760 Ma. Inclusions and cores indicative of inherited domains in the zircons were not found, and only a few analyses range from 1.1 to 1.8 Ga. A distinct xenocrystic zircon population was not identified. The 206Pb/238U weighted age averages of zircon indicate the following crystallization dates for the volcanic and volcaniclastic rocks closely associated with the gold deposits: 550 ± 3 Ma for Brewer, 553 ± 2 Ma for Haile, and 556 ± 2 Ma for the Ridgeway deposit. These zircon crystallization ages represent close estimates of the age of the original gold mineralizing events. Younger zircon spot ages can be attributed to the effects of Paleozoic regional metamorphism.
\nPb isotope compositions of sulfide minerals (galena, pyrite, enargite, sphalerite, chalcopyrite, and molybdenite) and silicate minerals (K-feldspar, and sericite) in the gold deposits help to constrain the sources of fluids and metals during the mineralizing events. The deposits are pyrite rich, containing multiple generations of pyrite, including early-crystallized pyrite that is closely associated with the original gold mineralizing event, as well as recrystallized pyrite formed in response to Paleozoic metamorphism. Pb isotope compositions of pyrite span a wide range, including the most radiogenic values for the sulfides. Galena and K-feldspar are not abundant but where present they are typically the least radiogenic minerals. Galena has a limited range of Pb isotope compositions that are representative of the gold deposits as a group (206Pb/204Pb = 18.020–18.326, 207Pb/204Pb = 15.550–15.639, 208Pb/204Pb = 37.605–38.286). Values of 207Pb/204Pb straddle the average crustal Pb growth curve, consistent with contributions involving the mantle and continental crust. Whole-rock Pb isotope compositions of volcanic and volcaniclastic rocks of the Persimmon Fork Formation nearly match the range for sulfides in the gold deposits. Subtle regional contrasts in Pb isotope compositions exist among the deposits. Sulfide minerals from Barite Hill (e.g., galena 206Pb/204Pb < 18.077) in southern South Carolina are generally less radiogenic than sulfides from Ridgeway (206Pb/204Pb > 18.169), Haile (206Pb/204Pb > 18.233), and Brewer (206Pb/204Pb > 18.311) in northern South Carolina. Because Pb isotope compositions of basement rocks from Grenville massifs in the southern Appalachians and sulfide minerals from the gold deposits do not match, a direct genetic connection cannot be established. Diversity in values of206Pb/204Pb and the relatively high values of 207Pb/204Pb suggest that the deposits evolved adjacent to or closely related to continental blocks, perhaps linked to a back-arc tectonic setting. Among potential younger analogues of the slate belt gold deposits are the sulfide deposits of the Okinawa trough in the western Pacific. Mantle-derived isotopic contributions were more important at Barite Hill in southern South Carolina, the least radiogenic among the deposits where oceanic crust had developed, than at Brewer, Haile, and Ridgeway in northern South Carolina where rifting thinned the continental crust.
\n","language":"English","publisher":"Society of Economic Geologists, Inc.","doi":"10.2113/100.2.225","issn":"03610128","usgsCitation":"Ayuso, R.A., Wooden, J., Foley, N.K., Seal, R.R., and Sinha, A.K., 2005, U-Pb zircon ages and Pb isotope geochemistry of gold deposits in the Carolina slate belt of South Carolina: Economic Geology, v. 100, no. 2, p. 225-252, https://doi.org/10.2113/100.2.225.","productDescription":"28 p.","startPage":"225","endPage":"252","numberOfPages":"28","onlineOnly":"N","additionalOnlineFiles":"N","costCenters":[{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"links":[{"id":237576,"rank":1,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Georgia, North Carolina, South Carolina, Virginia","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -78.431396484375,\n 36.923547681089296\n ],\n [\n -78.11279296875,\n 36.60670888641815\n ],\n [\n -78.20068359374999,\n 36.1822249804225\n ],\n [\n -78.50830078125,\n 35.7019167328534\n ],\n [\n -79.442138671875,\n 35.02999636902566\n ],\n [\n -80.44189453125,\n 34.098159345215535\n ],\n [\n -82.210693359375,\n 33.00866349457558\n ],\n [\n -82.46337890625,\n 32.9257074887604\n ],\n [\n -82.99072265625,\n 33.17434155100208\n ],\n [\n -82.9248046875,\n 33.916013113401696\n ],\n [\n -81.9580078125,\n 34.59704151614417\n ],\n [\n -81.05712890625,\n 35.15584570226544\n ],\n [\n -80.145263671875,\n 36.1733569352216\n ],\n [\n -79.661865234375,\n 36.78289206199065\n ],\n [\n -79.29931640625,\n 37.020098201368114\n ],\n [\n -78.72802734375,\n 37.020098201368114\n ],\n [\n -78.431396484375,\n 36.923547681089296\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"100","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bb9d0e4b08c986b327e18","contributors":{"authors":[{"text":"Ayuso, Robert A. 0000-0002-8496-9534 rayuso@usgs.gov","orcid":"https://orcid.org/0000-0002-8496-9534","contributorId":2654,"corporation":false,"usgs":true,"family":"Ayuso","given":"Robert","email":"rayuso@usgs.gov","middleInitial":"A.","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":421147,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wooden, Joseph L.","contributorId":32209,"corporation":false,"usgs":true,"family":"Wooden","given":"Joseph L.","affiliations":[],"preferred":false,"id":421148,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Foley, Nora K. 0000-0003-0124-3509 nfoley@usgs.gov","orcid":"https://orcid.org/0000-0003-0124-3509","contributorId":4010,"corporation":false,"usgs":true,"family":"Foley","given":"Nora","email":"nfoley@usgs.gov","middleInitial":"K.","affiliations":[{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":true,"id":421146,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Seal, Robert R. rseal@usgs.gov","contributorId":127495,"corporation":false,"usgs":true,"family":"Seal","given":"Robert","email":"rseal@usgs.gov","middleInitial":"R.","affiliations":[{"id":245,"text":"Eastern Mineral and Environmental Resources Science Center","active":true,"usgs":true}],"preferred":false,"id":421150,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Sinha, A. Krishna","contributorId":32998,"corporation":false,"usgs":true,"family":"Sinha","given":"A.","email":"","middleInitial":"Krishna","affiliations":[],"preferred":false,"id":421149,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70035204,"text":"70035204 - 2005 - Evidence for Mojave-Sonora megashear-Systematic left-lateral offset of Neoproterozoic to Lower Jurassic strata and facies, western United States and northwestern Mexico","interactions":[],"lastModifiedDate":"2020-09-11T15:56:53.389444","indexId":"70035204","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","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":"Evidence for Mojave-Sonora megashear-Systematic left-lateral offset of Neoproterozoic to Lower Jurassic strata and facies, western United States and northwestern Mexico","docAbstract":"
Major successions as well as individual units of Neoproterozoic to Lower Jurassic strata and facies appear to be systematically offset left laterally from eastern California and western Nevada in the western United States to Sonora, Mexico. This pattern is most evident in units such as the “Johnnie oolite,” a 1- to 2-m-thick oolite of the Neoproterozoic Rainstorm Member of the Johnnie Formation in the western United States and of the Clemente Formation in Sonora. The pattern is also evident in the Lower Cambrian Zabriskie Quartzite of the western United States and the correlative Proveedora Quartzite in Sonora. Matching of isopach lines of the Zabriskie Quartzite and Proveedora Quartzite suggests ∼700–800 km of left-lateral offset. The offset pattern is also apparent in the distribution of distinctive lithologic types, unconformities, and fossil assemblages in other rocks ranging in age from Neoproterozoic to Early Jurassic. In the western United States, the distribution of facies in Neoproterozoic and Paleozoic strata indicates that the Cordilleran miogeocline trends north-south. A north-south trend is also suggested in Sonora, and if so is compatible with offset of the miogeocline but not with the ideas that the miogeocline wrapped around the continental margin and trends east-west in Sonora. An imperfect stratigraphic match of supposed offset segments along the megashear is apparent. Some units, such as the “Johnnie oolite” and Zabriskie-Proveedora, show almost perfect correspondence, but other units are significantly different. The differences seem to indicate that the indigenous succession of the western United States and offset segments in Mexico were not precisely side by side before offset but were separated by an area—now buried, eroded, or destroyed—that contained strata of intermediate facies.
","language":"English","publisher":"Geological Society of America","doi":"10.1130/0-8137-2393-0.209","usgsCitation":"Stewart, J., 2005, Evidence for Mojave-Sonora megashear-Systematic left-lateral offset of Neoproterozoic to Lower Jurassic strata and facies, western United States and northwestern Mexico: Special Paper of the Geological Society of America, v. 393, p. 209-231, https://doi.org/10.1130/0-8137-2393-0.209.","productDescription":"23 p.","startPage":"209","endPage":"231","numberOfPages":"23","costCenters":[],"links":[{"id":243035,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Mexico, United States","state":"Baja California, California, Nevada, Sonora, Utah","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -111.3134765625,\n 28.65203063036226\n ],\n [\n -108.67675781249999,\n 28.806173508854776\n ],\n [\n -108.544921875,\n 30.675715404167743\n ],\n [\n -114.78515624999999,\n 32.39851580247402\n ],\n [\n -115.927734375,\n 34.95799531086792\n ],\n [\n -116.23535156249999,\n 36.84446074079564\n ],\n [\n -113.466796875,\n 39.774769485295465\n ],\n [\n -111.7529296875,\n 40.54720023441049\n ],\n [\n -114.6533203125,\n 41.705728515237524\n ],\n [\n -117.158203125,\n 41.11246878918088\n ],\n [\n -119.66308593749999,\n 37.055177106660814\n ],\n [\n -118.740234375,\n 34.379712580462204\n ],\n [\n -116.27929687499999,\n 32.879587173066305\n ],\n [\n -115.97167968750001,\n 31.80289258670676\n ],\n [\n -113.4228515625,\n 31.052933985705163\n ],\n [\n -112.6318359375,\n 30.637912028341123\n ],\n [\n -111.357421875,\n 28.844673680771795\n ],\n [\n -111.3134765625,\n 28.65203063036226\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"393","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0d2be4b0c8380cd52e59","contributors":{"authors":[{"text":"Stewart, John H.","contributorId":14383,"corporation":false,"usgs":true,"family":"Stewart","given":"John H.","affiliations":[],"preferred":false,"id":449718,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70031584,"text":"70031584 - 2005 - Loosely bound oxytetracycline in riverine sediments from two tributaries of the Chesapeake Bay","interactions":[],"lastModifiedDate":"2018-10-31T11:00:22","indexId":"70031584","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1565,"text":"Environmental Science & Technology","onlineIssn":"1520-5851","printIssn":"0013-936X","active":true,"publicationSubtype":{"id":10}},"title":"Loosely bound oxytetracycline in riverine sediments from two tributaries of the Chesapeake Bay","docAbstract":"The fate of antibiotics that bind to riverine sediment is not well understood. A solution used in geochemical extraction schemes to determine loosely bound species in sediments, 1 M MgCl2 (pH 8), was chosen to determine loosely bound, and potentially bioavailable, tetracycline antibiotics (TCs), including oxytetracycline (5-OH tetracycline) (OTC) in sediment samples from two rivers on the eastern shore of the Chesapeake Bay. Bottom sediments were collected at sites upstream from, at, and downstream from municipal sewage-treatment plants (STPs) situated on two natural waterways, Yellow Bank Stream, MD, and the Pocomoke River, MD. Concentrations of easily desorbed OTC ranged from 0.6 to approximately 1.2 μg g-1 dry wt sediment in Yellow Bank Stream and from 0.7 to approximately 3.3 μg g-1 dry wt sediment in the Pocomoke River. Concentrations of easily desorbable OTC were generally smaller in sediment upstream than in sediment downstream from the STP in the Pocomoke River. STPs and poultry manure are both potential sources of OTC to these streams. OTC that is loosely bound to sediment is subject to desorption. Other researchers have found desorbed TCs to be biologically active compounds.
Comparisons were made of the foraging ecology of Caspian Terns (Sterna caspia) nesting on two islands in the Columbia River estuary using radio telemetry and observations of prey fed to chicks and mates at each colony. Early in the chick-rearing period, radio-tagged terns nesting at Rice Island (river km 34) foraged mostly in the freshwater zone of the estuary close to the colony, while terns nesting on East Sand Island (river km 8) foraged in the marine or estuarine mixing zones close to that colony. Late in the chick-rearing period, Rice Island terns moved more of their foraging to the two zones lower in the estuary, while East Sand Island terns continued to forage in these areas. Tern diets at each colony corresponded to the primary foraging zone (freshwater vs. marine/mixing) of radio-tagged individuals: Early in chick-rearing, Rice Island terns relied heavily on juvenile salmonids (Oncorhynchus spp., 71% of identified prey), but this declined late in chick-rearing (46%). East Sand Island terns relied less on salmonids (42% and 16%, early and late in chick-rearing), and instead utilized marine fishes such as Anchovy (Engraulis mordax) and Herring (Clupea pallasi). Throughout chick-rearing, Rice Island terns foraged farther from their colony (median distance: 12.3 km during early chick-rearing and 16.9 km during late chick-rearing) than did East Sand Island terns (9.6 and 7.7 km, respectively). The study leads to the conclusion that Caspian Terns are generalist foragers and make use of the most proximate available forage fish resources when raising young.
Mammoth Mountain, which stands on the southwest rim of Long Valley caldera in eastern California, last erupted ∼57,000 years BP. Episodic volcanic unrest detected beneath the mountain since late 1979, however, emphasizes that the underlying volcanic system is still active and capable of producing future volcanic eruptions. The unrest symptoms include swarms of small (M ≤ 3) earthquakes, spasmodic bursts (rapid-fire sequences of brittle-failure earthquakes with overlapping coda), long-period (LP) and very-long-period (VLP) volcanic earthquakes, ground deformation, diffuse emission of magmatic CO2, and fumarole gases with elevated 3He/4He ratios. Spatial-temporal relations defined by the multi-parameter monitoring data together with earthquake source mechanisms suggest that this Mammoth Mountain unrest is driven by the episodic release of a volume of CO2-rich hydrous magmatic fluid derived from the upper reaches of a plexus of basaltic dikes and sills at mid-crustal depths (10–20 km). As the mobilized fluid ascends through the brittle–plastic transition zone and into overlying brittle crust, it triggers earthquake swarm activity and, in the case of the prolonged, 11-month-long earthquake swarm of 1989, crustal deformation and the onset of diffuse CO2 emissions. Future volcanic activity from this system would most likely involve steam explosions or small-volume, basaltic, strombolian or Hawaiian style eruptions. The impact of such an event would depend critically on vent location and season.
","largerWorkTitle":"Journal of Volcanology and Geothermal Research","language":"English","doi":"10.1016/j.jvolgeores.2005.03.002","issn":"03770273","usgsCitation":"Hill, D., and Prejean, S., 2005, Magmatic unrest beneath Mammoth Mountain, California: Journal of Volcanology and Geothermal Research, v. 146, no. 4, p. 257-283, https://doi.org/10.1016/j.jvolgeores.2005.03.002.","productDescription":"27 p.","startPage":"257","endPage":"283","numberOfPages":"27","costCenters":[{"id":615,"text":"Volcano Hazards Program","active":true,"usgs":true}],"links":[{"id":211100,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.jvolgeores.2005.03.002"},{"id":238283,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"California","otherGeospatial":"Mammoth Mountain","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -119.0544605255127,\n 37.617494852086566\n ],\n [\n -119.00570869445801,\n 37.617494852086566\n ],\n [\n -119.00570869445801,\n 37.64366515163273\n ],\n [\n -119.0544605255127,\n 37.64366515163273\n ],\n [\n -119.0544605255127,\n 37.617494852086566\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"146","issue":"4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a4b4fe4b0c8380cd69451","contributors":{"authors":[{"text":"Hill, D.P.","contributorId":27432,"corporation":false,"usgs":true,"family":"Hill","given":"D.P.","email":"","affiliations":[],"preferred":false,"id":415308,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Prejean, S.","contributorId":103442,"corporation":false,"usgs":true,"family":"Prejean","given":"S.","email":"","affiliations":[],"preferred":false,"id":415309,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70035307,"text":"70035307 - 2005 - Paleoproterozoic Mojave Province in northwestern Mexico? Isotopic and U-Pb zircon geochronologic studies of Precambrian and Cambrian crystalline and sedimentary rocks, Caborca, Sonora","interactions":[],"lastModifiedDate":"2020-09-11T16:27:58.582335","indexId":"70035307","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","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":"Paleoproterozoic Mojave Province in northwestern Mexico? Isotopic and U-Pb zircon geochronologic studies of Precambrian and Cambrian crystalline and sedimentary rocks, Caborca, Sonora","docAbstract":"Whole-rock Nd isotopic data and U-Pb zircon geochronology from Precambrian crystalline rocks in the Caborca area, northern Sonora, reveal that these rocks are most likely a segment of the Paleoproterozoic Mojave province. Supporting this conclusion are the observations that paragneiss from the > or =1.75 Ga Bamori Complex has a 2.4 Ga Nd model age and contains detrital zircons ranging in age from Paleoproterozoic (1.75 Ga) to Archean (3.2 Ga). Paragneisses with similar age and isotopic characteristics occur in the Mojave province in southern California. In addition, \"A-type\" granite exposed at the southern end of Cerro Rajon has ca 2.0 Ga Nd model age and a U-Pb zircon age of 1.71 Ga, which are similar to those of Paleoproterozoic granites in the Mojave province. Unlike the U.S. Mojave province, the Caborcan crust contains ca. 1.1 Ga granite (Aibo Granite), which our new Nd isotopic data suggest is largely the product of anatexis of the local Precambrian basement. Detrital zircons from Neoproterozoic to early Cambrian miogeoclinal arenites at Caborca show dominant populations ca. 1.7 Ga, ca. 1.4 Ga, and ca. 1.1 Ga, with subordinate Early Cambrian and Archean zircons. These zircons were likely derived predominately from North American crust to the east and northeast, and not from the underlying Caborcan basement. The general age and isotopic similarities between Mojave province basement and overlying miogeoclinal sedimentary rocks in Sonora and southern California is necessary, but not sufficient, proof of the hypothesis that Sonoran crust is allochthonous and was transported to its current position during the Mesozoic along the proposed Mojave-Sonora megashear. One viable alternative model is that the Caborcan Precambrian crust is an isolated, autochthonous segment of Mojave province crust that shares a similar, but not identical, Proterozoic geological history with Mojave province crust found in the southwest United States.
","language":"English","publisher":"Geological Society of America","doi":"10.1130/0-8137-2393-0.183","usgsCitation":"Farmer, G.L., Bowring, S., Matzel, J., Maldonado, G., Fedo, C., and Wooden, J., 2005, Paleoproterozoic Mojave Province in northwestern Mexico? Isotopic and U-Pb zircon geochronologic studies of Precambrian and Cambrian crystalline and sedimentary rocks, Caborca, Sonora: Special Paper of the Geological Society of America, v. 393, p. 183-198, https://doi.org/10.1130/0-8137-2393-0.183.","productDescription":"16 p.","startPage":"183","endPage":"198","numberOfPages":"16","costCenters":[],"links":[{"id":243134,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"Mexico","state":"Sonora","city":"Caborca","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -112.3736572265625,\n 29.262440796698915\n ],\n [\n -111.20361328125,\n 29.262440796698915\n ],\n [\n -111.20361328125,\n 30.826780904779774\n ],\n [\n -112.3736572265625,\n 30.826780904779774\n ],\n [\n -112.3736572265625,\n 29.262440796698915\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"393","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a7441e4b0c8380cd7753e","contributors":{"authors":[{"text":"Farmer, G. Lang","contributorId":15075,"corporation":false,"usgs":false,"family":"Farmer","given":"G.","email":"","middleInitial":"Lang","affiliations":[],"preferred":false,"id":450110,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Bowring, S. A.","contributorId":55164,"corporation":false,"usgs":false,"family":"Bowring","given":"S. A.","affiliations":[],"preferred":false,"id":450109,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Matzel, J.","contributorId":24190,"corporation":false,"usgs":true,"family":"Matzel","given":"J.","email":"","affiliations":[],"preferred":false,"id":450107,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Maldonado, G.E.","contributorId":27695,"corporation":false,"usgs":true,"family":"Maldonado","given":"G.E.","email":"","affiliations":[],"preferred":false,"id":450108,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Fedo, C.","contributorId":69379,"corporation":false,"usgs":true,"family":"Fedo","given":"C.","email":"","affiliations":[],"preferred":false,"id":450111,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Wooden, J.","contributorId":21736,"corporation":false,"usgs":true,"family":"Wooden","given":"J.","affiliations":[],"preferred":false,"id":450106,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70029108,"text":"70029108 - 2005 - Tree mortality, canopy turnover, and woody detritus in old cove forests of the southern Appalachians","interactions":[],"lastModifiedDate":"2021-07-07T14:38:10.051314","indexId":"70029108","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":1465,"text":"Ecology","active":true,"publicationSubtype":{"id":10}},"title":"Tree mortality, canopy turnover, and woody detritus in old cove forests of the southern Appalachians","docAbstract":"A long-term study of tree mortality, canopy turnover, and coarse woody detritus inputs was conducted in cove forests of the Great Smoky Mountains, Tennessee, USA. Seven old-growth stands were studied over a 10-yr period using 0.6–1.0 ha plots. Annual mortality of trees >10 cm dbh was 0.5–1.4% among stands (mean 0.7%). The highest mortality rate among canopy trees was exhibited by trees >80 cm dbh. An increase in mortality rate with canopy tree size was evident for two (Tsuga canadensis and Acer saccharum) of the three most abundant species in the forest. The increase in mortality with tree size had implications for canopy turnover and detritus input. Gap disturbance frequency was estimated at 0.008–0.019 forest area/yr, giving a return interval of ∼130 yr or less. Standing death was the most common mode of mortality (59%). Annual rates of snag formation were 1.4 snags/ha for trees >10 cm dbh and 0.4 snags/ha for trees >50 cm dbh. The density of large snags (>50 cm dbh) was 5 snags/ha. Snags accounted for 8% of the total standing tree basal area and 23% of the coarse woody detritus mass (total of 48 Mg/ ha). The mean annual rate of coarse woody detritus input was 3.0 Mg/ha. A decay rate constant was estimated at 0.07, yielding a detritus half-life of 10 yr. Although mean mortality rates and canopy turnover in old cove forests were moderate in comparison with other old forests of eastern North America, input and accumulation of coarse woody detritus were high for the region. This resulted, in part, from the relatively large sizes attained by canopy trees and the fact that larger trees tended to suffer higher mortality. In comparison to forests worldwide, rates of mortality, canopy gap formation, and decay of coarse woody detritus were intermediate.
","language":"English","publisher":"Ecological Society of America","doi":"10.1890/04-0410","usgsCitation":"Busing, R.T., 2005, Tree mortality, canopy turnover, and woody detritus in old cove forests of the southern Appalachians: Ecology, v. 86, no. 1, p. 73-84, https://doi.org/10.1890/04-0410.","productDescription":"12 p.","startPage":"73","endPage":"84","numberOfPages":"12","costCenters":[],"links":[{"id":237937,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Tennessee","otherGeospatial":"Great Smoky Mountains","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -84.61669921875,\n 35.18278813800229\n ],\n [\n -82.584228515625,\n 35.99578538642032\n ],\n [\n -83.067626953125,\n 36.25313319699069\n ],\n [\n -84.70458984375,\n 35.594785665487244\n ],\n [\n -84.61669921875,\n 35.18278813800229\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"86","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bb79ce4b08c986b32739a","contributors":{"authors":[{"text":"Busing, Richard T.","contributorId":13303,"corporation":false,"usgs":true,"family":"Busing","given":"Richard","email":"","middleInitial":"T.","affiliations":[],"preferred":false,"id":421356,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70027728,"text":"70027728 - 2005 - An efficient algorithm for double-difference tomography and location in heterogeneous media, with an application to the Kilauea volcano","interactions":[],"lastModifiedDate":"2019-05-08T08:48:32","indexId":"70027728","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","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":"An efficient algorithm for double-difference tomography and location in heterogeneous media, with an application to the Kilauea volcano","docAbstract":"Improving our understanding of crustal processes requires a better knowledge of the geometry and the position of geological bodies. In this study we have designed a method based upon double-difference relocation and tomography to image, as accurately as possible, a heterogeneous medium containing seismogenic objects. Our approach consisted not only of incorporating double difference in tomography but also partly in revisiting tomographic schemes for choosing accurate and stable numerical strategies, adapted to the use of cross-spectral time delays. We used a finite difference solution to the eikonal equation for travel time computation and a Tarantola-Valette approach for both the classical and double-difference three-dimensional tomographic inversion to find accurate earthquake locations and seismic velocity estimates. We estimated efficiently the square root of the inverse model's covariance matrix in the case of a Gaussian correlation function. It allows the use of correlation length and a priori model variance criteria to determine the optimal solution. Double-difference relocation of similar earthquakes is performed in the optimal velocity model, making absolute and relative locations less biased by the velocity model. Double-difference tomography is achieved by using high-accuracy time delay measurements. These algorithms have been applied to earthquake data recorded in the vicinity of Kilauea and Mauna Loa volcanoes for imaging the volcanic structures. Stable and detailed velocity models are obtained: the regional tomography unambiguously highlights the structure of the island of Hawaii and the double-difference tomography shows a detailed image of the southern Kilauea caldera-upper east rift zone magmatic complex. Copyright 2005 by the American Geophysical Union.","language":"English","publisher":"AGU","doi":"10.1029/2004JB003466","issn":"01480227","usgsCitation":"Monteiller, V., Got, J., Virieux, J., and Okubo, P., 2005, An efficient algorithm for double-difference tomography and location in heterogeneous media, with an application to the Kilauea volcano: Journal of Geophysical Research B: Solid Earth, v. 110, no. 12, p. 1-22, https://doi.org/10.1029/2004JB003466.","productDescription":"22 p.","startPage":"1","endPage":"22","numberOfPages":"22","costCenters":[{"id":615,"text":"Volcano Hazards Program","active":true,"usgs":true}],"links":[{"id":477690,"rank":10000,"type":{"id":40,"text":"Open Access Publisher Index Page"},"url":"https://doi.org/10.1029/2004jb003466","text":"Publisher Index Page"},{"id":238140,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":211005,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1029/2004JB003466"}],"country":"United States","state":"Hawaii","otherGeospatial":"Kilauea volcano","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -155.3679656982422,\n 19.281980191903514\n ],\n [\n -155.137939453125,\n 19.281980191903514\n ],\n [\n -155.137939453125,\n 19.479539596600667\n ],\n [\n -155.3679656982422,\n 19.479539596600667\n ],\n [\n -155.3679656982422,\n 19.281980191903514\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"110","issue":"12","noUsgsAuthors":false,"publicationDate":"2005-12-16","publicationStatus":"PW","scienceBaseUri":"5059ea2fe4b0c8380cd486b4","contributors":{"authors":[{"text":"Monteiller, V.","contributorId":62409,"corporation":false,"usgs":true,"family":"Monteiller","given":"V.","email":"","affiliations":[],"preferred":false,"id":414968,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Got, J.-L.","contributorId":80867,"corporation":false,"usgs":true,"family":"Got","given":"J.-L.","email":"","affiliations":[],"preferred":false,"id":414969,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Virieux, J.","contributorId":10617,"corporation":false,"usgs":true,"family":"Virieux","given":"J.","email":"","affiliations":[],"preferred":false,"id":414966,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Okubo, P. 0000-0002-0381-6051","orcid":"https://orcid.org/0000-0002-0381-6051","contributorId":49432,"corporation":false,"usgs":true,"family":"Okubo","given":"P.","affiliations":[{"id":617,"text":"Volcano Science Center","active":true,"usgs":true}],"preferred":false,"id":414967,"contributorType":{"id":1,"text":"Authors"},"rank":4}]}} ,{"id":70035419,"text":"70035419 - 2005 - Reconnaissance study of late quaternary faulting along Cerro Goden fault zone, western Puerto Rico","interactions":[],"lastModifiedDate":"2020-09-01T21:09:35.440122","indexId":"70035419","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","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":"Reconnaissance study of late quaternary faulting along Cerro Goden fault zone, western Puerto Rico","docAbstract":"The Cerro Goden fault zone is associated with a curvilinear, continuous, and prominent topographic lineament in western Puerto Rico. The fault varies in strike from northwest to west. In its westernmost section, the fault is ∼500 m south of an abrupt, curvilinear mountain front separating the 270- to 361-m-high La Cadena de San Francisco range from the Rio Añasco alluvial valley. The Quaternary fault of the Añasco Valley is in alignment with the bedrock fault mapped by D. McIntyre (1971) in the Central La Plata quadrangle sheet east of Añasco Valley. Previous workers have postulated that the Cerro Goden fault zone continues southeast from the Añasco Valley and merges with the Great Southern Puerto Rico fault zone of south-central Puerto Rico. West of the Añasco Valley, the fault continues offshore into the Mona Passage (Caribbean Sea) where it is characterized by offsets of seafloor sediments estimated to be of late Quaternary age. Using both 1:18,500 scale air photographs taken in 1936 and 1:40,000 scale photographs taken by the U.S. Department of Agriculture in 1986, we identified geomorphic features suggestive of Quaternary fault movement in the Añasco Valley, including aligned and deflected drainages, apparently offset terrace risers, and mountain-facing scarps. Many of these features suggest right-lateral displacement.
Mapping of Paleogene bedrock units in the uplifted La Cadena range adjacent to the Cerro Goden fault zone reveals the main tectonic events that have culminated in late Quaternary normal-oblique displacement across the Cerro Goden fault. Cretaceous to Eocene rocks of the La Cadena range exhibit large folds with wavelengths of several kms. The orientation of folds and analysis of fault striations within the folds indicate that the folds formed by northeast-southwest shortening in present-day geographic coordinates. The age of deformation is well constrained as late Eocene–early Oligocene by an angular unconformity separating folded, deep-marine middle Eocene rocks from transgressive, shallow-marine rocks of middle-upper Oligocene age. Rocks of middle Oligocene–early Pliocene age above unconformity are gently folded about the roughly east-west–trending Puerto Rico–Virgin Islands arch, which is well expressed in the geomorphology of western Puerto Rico. Arching appears ongoing because onshore and offshore late Quaternary oblique-slip faults closely parallel the complexly deformed crest of the arch and appear to be related to extensional strains focused in the crest of the arch. We estimate ∼4 km of vertical throw on the Cerro Goden fault based on the position of the carbonate cap north of the fault in the La Cadena de San Francisco and its position south of the fault inferred from seismic reflection data in Mayaguez Bay. Based on these observations, our interpretation of the kinematics and history of the Cerro Goden fault zone includes two major phases of motion: (1) Eocene northeast-southwest shortening possibly accompanied by left-lateral shearing as determined by previous workers on the Great Southern Puerto Rico fault zone; and (2) post–early Pliocene regional arching of Puerto Rico accompanied by normal offset and right-lateral shear along faults flanking the crest of the arch. The second phase of deformation accompanied east-west opening of the Mona rift and is inferred to continue to the present day.
","language":"English","publisher":"Geological Society of America","doi":"10.1130/0-8137-2385-X.115","usgsCitation":"Mann, P., Prentice, C., Hippolyte, J., Grindlay, N., Abrams, L., and Lao-Davila, D., 2005, Reconnaissance study of late quaternary faulting along Cerro Goden fault zone, western Puerto Rico: Special Paper of the Geological Society of America, v. 385, p. 115-137, https://doi.org/10.1130/0-8137-2385-X.115.","productDescription":"23 p.","startPage":"115","endPage":"137","numberOfPages":"23","costCenters":[],"links":[{"id":243175,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Puerto Rico","otherGeospatial":"Cerro Goden fault zone","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -67.3187255859375,\n 17.926475979176438\n ],\n [\n -66.33270263671875,\n 17.926475979176438\n ],\n [\n -66.33270263671875,\n 18.521283325496277\n ],\n [\n -67.3187255859375,\n 18.521283325496277\n ],\n [\n -67.3187255859375,\n 17.926475979176438\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"385","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a9913e4b0c8380cd82d6f","contributors":{"authors":[{"text":"Mann, P.","contributorId":55167,"corporation":false,"usgs":true,"family":"Mann","given":"P.","email":"","affiliations":[],"preferred":false,"id":450576,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Prentice, C.S.","contributorId":56667,"corporation":false,"usgs":true,"family":"Prentice","given":"C.S.","email":"","affiliations":[],"preferred":false,"id":450577,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hippolyte, J.-C.","contributorId":36377,"corporation":false,"usgs":true,"family":"Hippolyte","given":"J.-C.","email":"","affiliations":[],"preferred":false,"id":450574,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Grindlay, N.R.","contributorId":28445,"corporation":false,"usgs":true,"family":"Grindlay","given":"N.R.","email":"","affiliations":[],"preferred":false,"id":450573,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Abrams, L.J.","contributorId":98968,"corporation":false,"usgs":true,"family":"Abrams","given":"L.J.","email":"","affiliations":[],"preferred":false,"id":450578,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Lao-Davila, D.","contributorId":44753,"corporation":false,"usgs":true,"family":"Lao-Davila","given":"D.","email":"","affiliations":[],"preferred":false,"id":450575,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70035420,"text":"70035420 - 2005 - Eastern rim of the Chesapeake Bay impact crater: Morphology, stratigraphy, and structure","interactions":[],"lastModifiedDate":"2017-08-24T14:46:32","indexId":"70035420","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","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":"Eastern rim of the Chesapeake Bay impact crater: Morphology, stratigraphy, and structure","docAbstract":"This study reexamines seven reprocessed (increased vertical exaggeration) seismic reflection profiles that cross the eastern rim of the Chesapeake Bay impact crater. The eastern rim is expressed as an arcuate ridge that borders the crater in a fashion typical of the \"raised\" rim documented in many well preserved complex impact craters. The inner boundary of the eastern rim (rim wall) is formed by a series of raterfacing, steep scarps, 15-60 m high. In combination, these rim-wall scarps represent the footwalls of a system of crater-encircling normal faults, which are downthrown toward the crater. Outboard of the rim wall are several additional normal-fault blocks, whose bounding faults trend approximately parallel to the rim wall. The tops of the outboard fault blocks form two distinct, parallel, flat or gently sloping, terraces. The innermost terrace (Terrace 1) can be identified on each profile, but Terrace 2 is only sporadically present. The terraced fault blocks are composed mainly of nonmarine, poorly to moderately consolidated, siliciclastic sediments, belonging to the Lower Cretaceous Potomac Formation. Though the ridge-forming geometry of the eastern rim gives the appearance of a raised compressional feature, no compelling evidence of compressive forces is evident in the profiles studied. The structural mode, instead, is that of extension, with the clear dominance of normal faulting as the extensional mechanism.
","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Special Paper of the Geological Society of America","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1130/0-8137-2384-1.117","issn":"00721077","usgsCitation":"Poag, C.W., 2005, Eastern rim of the Chesapeake Bay impact crater: Morphology, stratigraphy, and structure: Special Paper of the Geological Society of America, no. 384, p. 117-130, https://doi.org/10.1130/0-8137-2384-1.117.","productDescription":"14 p.","startPage":"117","endPage":"130","costCenters":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":243176,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":215377,"rank":9999,"type":{"id":15,"text":"Index Page"},"url":"https://pubs.geoscienceworld.org/books/book/542/chapter/3801888/Eastern-rim-of-the-Chesapeake-Bay-impact-crater?redirectedFrom=PDF"}],"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 -76.69830322265625,\n 38.06322991452768\n ],\n [\n -75.98693847656249,\n 38.06322991452768\n ],\n [\n -75.98693847656249,\n 39.54641191968671\n ],\n [\n -76.69830322265625,\n 39.54641191968671\n ],\n [\n -76.69830322265625,\n 38.06322991452768\n ]\n ]\n ]\n }\n }\n ]\n}","issue":"384","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a0536e4b0c8380cd50ce3","contributors":{"authors":[{"text":"Poag, C. W.","contributorId":16402,"corporation":false,"usgs":true,"family":"Poag","given":"C.","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":450579,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ,{"id":70027723,"text":"70027723 - 2005 - Further evidence for the invasion and establishment of Pterois volitans (Teleostei: Scorpaenidae) along the Atlantic Coast of the United States","interactions":[],"lastModifiedDate":"2012-03-12T17:20:49","indexId":"70027723","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3444,"text":"Southeastern Naturalist","active":true,"publicationSubtype":{"id":10}},"title":"Further evidence for the invasion and establishment of Pterois volitans (Teleostei: Scorpaenidae) along the Atlantic Coast of the United States","docAbstract":"We document the continued population expansion of red lionfish, Pterois volitans, the first documented successful introduction of an invasive marine fish species from the western Pacific to Atlantic coastal waters of the United States. Red lionfish are indigenous to the Indo-Pacific and have apparently established one or more breeding populations on reefs off the southeastern United States. Fifty-nine specimens, most presumably adult red lionfish, were documented or collected on live-bottom reefs off North Carolina, South Carolina, and Florida, and on a manmade structure off Georgia. Observation/collection depths and bottom water temperatures for these fish ranged from 40-99 m and 13.8-24.4??C, respectively. Eleven juvenile lionfish, believed to be expatriated from southeastern waters, were collected in estuaries along the coast of Long Island, NY, at depths of 0-5 m and water temperatures ranging from 13.8-16.5??C. Twelve of the total 70 specimens collected or observed were positively identified as red lionfish. Based on histological assessment of gonad tissue, two reproductively-active males and one immature female were collected. The life history of red lionfish, especially their reproductive biology and food habits, should be investigated along the east coast of the US to determine the potential impacts of this species on ecosystems they have invaded.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Southeastern Naturalist","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1656/1528-7092(2005)004[0193:FEFTIA]2.0.CO;2","issn":"15287092","usgsCitation":"Meister, H., Wyanski, D., Loefer, J., Ross, S.W., Quattrini, A., and Sulak, K., 2005, Further evidence for the invasion and establishment of Pterois volitans (Teleostei: Scorpaenidae) along the Atlantic Coast of the United States: Southeastern Naturalist, v. 4, no. 2, p. 193-206, https://doi.org/10.1656/1528-7092(2005)004[0193:FEFTIA]2.0.CO;2.","startPage":"193","endPage":"206","numberOfPages":"14","costCenters":[],"links":[{"id":210981,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1656/1528-7092(2005)004[0193:FEFTIA]2.0.CO;2"},{"id":238101,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"4","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a1423e4b0c8380cd5491a","contributors":{"authors":[{"text":"Meister, H.S.","contributorId":30814,"corporation":false,"usgs":true,"family":"Meister","given":"H.S.","email":"","affiliations":[],"preferred":false,"id":414945,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Wyanski, D.M.","contributorId":22962,"corporation":false,"usgs":true,"family":"Wyanski","given":"D.M.","email":"","affiliations":[],"preferred":false,"id":414944,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Loefer, J.K.","contributorId":95673,"corporation":false,"usgs":true,"family":"Loefer","given":"J.K.","email":"","affiliations":[],"preferred":false,"id":414949,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Ross, Steve W.","contributorId":72543,"corporation":false,"usgs":false,"family":"Ross","given":"Steve","email":"","middleInitial":"W.","affiliations":[],"preferred":false,"id":414947,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Quattrini, A.M.","contributorId":70985,"corporation":false,"usgs":true,"family":"Quattrini","given":"A.M.","affiliations":[],"preferred":false,"id":414946,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Sulak, K. J. 0000-0002-4795-9310","orcid":"https://orcid.org/0000-0002-4795-9310","contributorId":76690,"corporation":false,"usgs":true,"family":"Sulak","given":"K. J.","affiliations":[],"preferred":false,"id":414948,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70027676,"text":"70027676 - 2005 - An evaluation of sampling strategies to improve precision of estimates of gross change in land use and land cover","interactions":[],"lastModifiedDate":"2017-04-10T13:06:21","indexId":"70027676","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2068,"text":"International Journal of Remote Sensing","active":true,"publicationSubtype":{"id":10}},"title":"An evaluation of sampling strategies to improve precision of estimates of gross change in land use and land cover","docAbstract":"Statistical sampling offers a cost-effective, practical alternative to complete-coverage mapping for the objective of estimating gross change in land cover over large areas. Because land cover change is typically rare, the sampling strategy must take advantage of design and analysis tools that enhance precision. Using two populations of land cover change in the eastern United States, we demonstrate that the choice of sampling unit size and use of a survey sampling regression estimator can significantly improve precision with only a minor increase in cost.
","language":"English","publisher":"Taylor & Francis","doi":"10.1080/01431160500222632","issn":"01431161","usgsCitation":"Stehman, S., Sohl, T.L., and Loveland, T., 2005, An evaluation of sampling strategies to improve precision of estimates of gross change in land use and land cover: International Journal of Remote Sensing, v. 26, no. 22, p. 4941-4957, https://doi.org/10.1080/01431160500222632.","productDescription":"17 p.","startPage":"4941","endPage":"4957","numberOfPages":"17","costCenters":[{"id":222,"text":"Earth Resources Observation and Science (EROS) Center","active":true,"usgs":true}],"links":[{"id":238501,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":211246,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1080/01431160500222632"}],"volume":"26","issue":"22","noUsgsAuthors":false,"publicationDate":"2011-03-04","publicationStatus":"PW","scienceBaseUri":"5059ea50e4b0c8380cd48793","contributors":{"authors":[{"text":"Stehman, S.V.","contributorId":91974,"corporation":false,"usgs":false,"family":"Stehman","given":"S.V.","email":"","affiliations":[{"id":27852,"text":"State University of New York, Syracuse","active":true,"usgs":false}],"preferred":false,"id":414684,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Sohl, Terry L. 0000-0002-9771-4231","orcid":"https://orcid.org/0000-0002-9771-4231","contributorId":76419,"corporation":false,"usgs":true,"family":"Sohl","given":"Terry","email":"","middleInitial":"L.","affiliations":[],"preferred":false,"id":414683,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Loveland, Thomas R. 0000-0003-3114-6646","orcid":"https://orcid.org/0000-0003-3114-6646","contributorId":106125,"corporation":false,"usgs":true,"family":"Loveland","given":"Thomas R.","affiliations":[{"id":222,"text":"Earth Resources Observation and Science (EROS) Center","active":true,"usgs":true}],"preferred":false,"id":414685,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70029184,"text":"70029184 - 2005 - Generation and validation of characteristic spectra from EO1 Hyperion image data for detecting the occurrence of the invasive species, Chinese tallow","interactions":[],"lastModifiedDate":"2012-03-12T17:20:48","indexId":"70029184","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2068,"text":"International Journal of Remote Sensing","active":true,"publicationSubtype":{"id":10}},"title":"Generation and validation of characteristic spectra from EO1 Hyperion image data for detecting the occurrence of the invasive species, Chinese tallow","docAbstract":"Chinese tallow (Triadica sebifera) is an invasive tree that is spreading throughout the south-eastern United States and now into the west, and in many places causing extensive change to native habitat and associated wildlife. Detecting and mapping the relative distribution of this species is important to its control and eradication. To map the relative distribution of Chinese tallow within a southwestern Louisiana coastal wetland to upland environment, Earth Observing 1 (EO1) satellite Hyperion sensor hyperspectral image data were combined with a subpixel extraction method that modelled characteristic spectra from the image data without requiring a priori characteristic spectra. Because of the low percentage occurrences of Chinese tallow and high spectral covariation in the environment, unique validation and verification methods were implemented, relying on simultaneous collection of field canopy reflectance spectra and subsequent classification of canopy compositions. The subpixel extraction method produced five characteristic spectra, which we further refined to four that adequately represented the field spectra, as well as the Hyperion imaged canopy reflectance datasets. Characteristic spectra were designated as senescing foliage, cypress-tupelo trees, and trees without leaves; shadows and green vegetation; senescing Chinese tallow with yellow leaves and yellowing foliage; and senescing Chinese tallow with red leaves ('red tallow'). About 81% (n=34) of the field and 78% (n=33) of the Hyperion imaged characteristic spectra associated with 'red tallow' were explained by the compositions generated in the field slide classifications. ?? 2005 US Government.","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"International Journal of Remote Sensing","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.1080/01431160512331326710","issn":"01431161","usgsCitation":"Ramsey, E., Rangoonwala, A., Nelson, G., Ehrlich, R., and Martella, K., 2005, Generation and validation of characteristic spectra from EO1 Hyperion image data for detecting the occurrence of the invasive species, Chinese tallow: International Journal of Remote Sensing, v. 26, no. 8, p. 1611-1636, https://doi.org/10.1080/01431160512331326710.","startPage":"1611","endPage":"1636","numberOfPages":"26","costCenters":[],"links":[{"id":210859,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1080/01431160512331326710"},{"id":237906,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"26","issue":"8","noUsgsAuthors":false,"publicationDate":"2007-02-22","publicationStatus":"PW","scienceBaseUri":"505a1550e4b0c8380cd54d54","contributors":{"authors":[{"text":"Ramsey, Elijah W. III 0000-0002-4518-5796","orcid":"https://orcid.org/0000-0002-4518-5796","contributorId":72769,"corporation":false,"usgs":true,"family":"Ramsey","given":"Elijah W.","suffix":"III","affiliations":[{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true}],"preferred":false,"id":421663,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Rangoonwala, A. 0000-0002-0556-0598","orcid":"https://orcid.org/0000-0002-0556-0598","contributorId":95248,"corporation":false,"usgs":true,"family":"Rangoonwala","given":"A.","affiliations":[{"id":17705,"text":"Wetland and Aquatic Research Center","active":true,"usgs":true}],"preferred":false,"id":421664,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Nelson, G.","contributorId":101072,"corporation":false,"usgs":true,"family":"Nelson","given":"G.","affiliations":[],"preferred":false,"id":421665,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Ehrlich, R.","contributorId":72192,"corporation":false,"usgs":true,"family":"Ehrlich","given":"R.","email":"","affiliations":[],"preferred":false,"id":421662,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Martella, K.","contributorId":42417,"corporation":false,"usgs":true,"family":"Martella","given":"K.","affiliations":[],"preferred":false,"id":421661,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70027641,"text":"70027641 - 2005 - Northwest Basin and Range tectonic deformation observed with the Global Positioning System, 1999-2003","interactions":[],"lastModifiedDate":"2012-03-12T17:20:49","indexId":"70027641","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","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":"Northwest Basin and Range tectonic deformation observed with the Global Positioning System, 1999-2003","docAbstract":"We use geodetic velocities obtained with the Global Positioning System (GPS) to quantify tectonic deformation of the northwest Basin and Range province of the western United States. The results are based on GPS data collected in 1999 and 2003 across five new quasi-linear networks in northern Nevada, northeast California, and southeast Oregon. The velocities show ???3 mm/yr westward movement of northern Nevada with respect to stable North America. West of longitude 119??W the velocities increase and turn northwest, parallel to Sierra Nevada/Great Valley microplate motion, and similar to velocities previously obtained to the south. The observations are explained by a kinematic model with three domains that rotate around Euler poles in eastern Oregon and western Idaho. Northeast California experiences internal dextral shear deformation (11.2 ?? 3.6 nstrain/yr) subparallel to Pacific/North America motion. Relative motions of the domains imply 2-5 mm/yr approximately east-west extension in northwest Nevada and 1-4 mm/yr approximately north-south contraction near the California/Oregon border. The northward decreasing approximately east-west extension in northwest Nevada is consistent with the northern termination of Basin and Range deformation, faulting and characteristic topography. No significant extension is detected in the Oregon Basin and Range. The Oregon Cascade arc moves north at ???3.5 mm/yr and is possibly influenced by the approximately eastward motion of the Juan de Fuca plate. These results disagree with secular northwest trenchward motion of the Oregon forearc inferred from paleomagnetic rotations. South of latitude 43??, however, trenchward motion exists and is consistent with block rotations, approximately east-west Basin and Range extension, and northwest Sierra Nevada translation. Copyright 2005 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":"10.1029/2005JB003678","issn":"01480227","usgsCitation":"Hammond, W., and Thatcher, W., 2005, Northwest Basin and Range tectonic deformation observed with the Global Positioning System, 1999-2003: Journal of Geophysical Research B: Solid Earth, v. 110, no. 10, p. 1-12, https://doi.org/10.1029/2005JB003678.","startPage":"1","endPage":"12","numberOfPages":"12","costCenters":[],"links":[{"id":477956,"rank":10000,"type":{"id":41,"text":"Open Access External Repository Page"},"url":"http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.180.3004","text":"External Repository"},{"id":210885,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1029/2005JB003678"},{"id":237953,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"110","issue":"10","noUsgsAuthors":false,"publicationDate":"2005-10-27","publicationStatus":"PW","scienceBaseUri":"505a684ce4b0c8380cd7371c","contributors":{"authors":[{"text":"Hammond, W.C.","contributorId":19347,"corporation":false,"usgs":true,"family":"Hammond","given":"W.C.","email":"","affiliations":[],"preferred":false,"id":414526,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Thatcher, W.","contributorId":32669,"corporation":false,"usgs":true,"family":"Thatcher","given":"W.","email":"","affiliations":[],"preferred":false,"id":414527,"contributorType":{"id":1,"text":"Authors"},"rank":2}]}} ,{"id":70029222,"text":"70029222 - 2005 - U-Pb zircon geochronology of Paleoproterozoic plutons from the northern midcontinent, USA: Evidence for subduction flip and continued convergence after geon 18 Penokean orogenesis","interactions":[],"lastModifiedDate":"2012-03-12T17:20:51","indexId":"70029222","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","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":"U-Pb zircon geochronology of Paleoproterozoic plutons from the northern midcontinent, USA: Evidence for subduction flip and continued convergence after geon 18 Penokean orogenesis","docAbstract":"We propose that the late Paleoproterozoic igneous and deformational history preserved in the northern midcontinent United States can be explained by a change in subduction-polarity from geon 18 south-dipping subduction during Penokean accretion to geon 17 north-dipping subduction as convergence continued after Penokean orogenesis. New U-Pb zircon ages indicate that late to post-Penokean magmatism occurred at ca. 1800, 1775, and 1750 Ma and generally migrated southeastward across the newly accreted Penokean terrane. We suggest that geon 17 Yavapai slab rollback caused continental arc magmatism to step southeastward between 1800 and 1750 Ma. As the slab steepened, reduced compressional stresses and magma-induced thermal weakening allowed for collapse of the overthickened portions of the Penokean crust. Postcollapse crustal stabilization (the 1750-1650 Ma Baraboo interval) was followed by geon 16 Mazatzal arc accretion further south. The 1900-1600 Ma tectonic history of the north-central United States, not surprisingly, records events related to the southward growth and tectonic development of the southern Laurentian margin. New and published 40Ar/ 39Ar mineral ages delineate the northern and western extent of geon 16 Mazatzal deformation. Interestingly, only little exhumed crust intruded by a small volume of shallow-level ca. 1750 Ma plutons (and associated rhyolites) was deformed significantly during geon 16. In contrast, more deeply exhumed crust and crust pervasively invaded by a large volume of post-Penokean magma (i.e., East-Central Minnesota Batholith) were largely unaffected by Mazatzal deformation and reheating. We suggest that posttectonic intrusions and crustal thinning were an important step in strengthening and stabilizing the crust in the southern Lake Superior region. ?? 2005 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/B25395.1","issn":"00167606","usgsCitation":"Holm, D., Van Schmus, W.R., MacNeill, L., Boerboom, T., Schweitzer, D., and Schneider, D., 2005, U-Pb zircon geochronology of Paleoproterozoic plutons from the northern midcontinent, USA: Evidence for subduction flip and continued convergence after geon 18 Penokean orogenesis: Geological Society of America Bulletin, v. 117, no. 3-4, p. 259-275, https://doi.org/10.1130/B25395.1.","startPage":"259","endPage":"275","numberOfPages":"17","costCenters":[],"links":[{"id":237366,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":210447,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1130/B25395.1"}],"volume":"117","issue":"3-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505bb9d6e4b08c986b327e42","contributors":{"authors":[{"text":"Holm, D.K.","contributorId":68955,"corporation":false,"usgs":true,"family":"Holm","given":"D.K.","email":"","affiliations":[],"preferred":false,"id":421815,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Van Schmus, W. R.","contributorId":83114,"corporation":false,"usgs":true,"family":"Van Schmus","given":"W.","email":"","middleInitial":"R.","affiliations":[],"preferred":false,"id":421816,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"MacNeill, L.C.","contributorId":94848,"corporation":false,"usgs":true,"family":"MacNeill","given":"L.C.","email":"","affiliations":[],"preferred":false,"id":421817,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Boerboom, Terrence","contributorId":11785,"corporation":false,"usgs":true,"family":"Boerboom","given":"Terrence","affiliations":[],"preferred":false,"id":421812,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Schweitzer, D.","contributorId":55632,"corporation":false,"usgs":true,"family":"Schweitzer","given":"D.","email":"","affiliations":[],"preferred":false,"id":421814,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Schneider, D.","contributorId":52752,"corporation":false,"usgs":true,"family":"Schneider","given":"D.","email":"","affiliations":[],"preferred":false,"id":421813,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70027593,"text":"70027593 - 2005 - Revised magnitude-bound relation for the Wabash Valley seismic zone of the central United States","interactions":[],"lastModifiedDate":"2022-06-02T16:09:42.909132","indexId":"70027593","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":3372,"text":"Seismological Research Letters","onlineIssn":"1938-2057","printIssn":"0895-0695","active":true,"publicationSubtype":{"id":10}},"title":"Revised magnitude-bound relation for the Wabash Valley seismic zone of the central United States","docAbstract":"Seismic hazard assessment in the central United States, and in particular the Wabash Valley seismic zone of Indiana-Illinois, frequently relies on empirical estimates of paleoearthquake magnitudes (M). In large part these estimates have been made using the magnitude-bound method. Existing region-specific magnitude-bound relations rely heavily on only a few historical earthquakes in the central United States and eastern Canada that induced reported liquefaction features. Recent seismological studies have suggested smaller magnitudes than previously presumed for some of these earthquakes, however, and other studies have reinterpreted site-to-source distances to liquefaction features associated with some of these earthquakes. In this paper, we re-examine historical earthquakes (M > ∼5) that occurred in the central and eastern United States and eastern Canada; some of these earthquakes triggered liquefaction and others did not. Based on our findings, we reinterpret the region-specific magnitude-bound relation for the Wabash Valley. Using this revised magnitude-bound relation, we present magnitude estimates for four prehistoric earthquakes that occurred in the Wabash Valley seismic zone during Holocene time.
","language":"English","publisher":"Seismological Society of America","doi":"10.1785/gssrl.76.6.756","usgsCitation":"Olson, S.M., Green, R.A., and Obermeier, S.F., 2005, Revised magnitude-bound relation for the Wabash Valley seismic zone of the central United States: Seismological Research Letters, v. 76, no. 6, p. 756-771, https://doi.org/10.1785/gssrl.76.6.756.","productDescription":"16 p.","startPage":"756","endPage":"771","numberOfPages":"16","costCenters":[],"links":[{"id":238271,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Illinois, Indiana","otherGeospatial":"Wabash Valley seismic zone","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -89.5166015625,\n 37.77071473849609\n ],\n [\n -85.18798828125,\n 37.77071473849609\n ],\n [\n -85.18798828125,\n 41.31082388091818\n ],\n [\n -89.5166015625,\n 41.31082388091818\n ],\n [\n -89.5166015625,\n 37.77071473849609\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"76","issue":"6","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505aacc6e4b0c8380cd86dc9","contributors":{"authors":[{"text":"Olson, Scott M.","contributorId":11257,"corporation":false,"usgs":true,"family":"Olson","given":"Scott","email":"","middleInitial":"M.","affiliations":[],"preferred":false,"id":414281,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Green, Russell A.","contributorId":94708,"corporation":false,"usgs":false,"family":"Green","given":"Russell","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":414280,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Obermeier, Stephen F.","contributorId":102482,"corporation":false,"usgs":true,"family":"Obermeier","given":"Stephen","email":"","middleInitial":"F.","affiliations":[],"preferred":false,"id":414279,"contributorType":{"id":1,"text":"Authors"},"rank":3}]}} ,{"id":70027588,"text":"70027588 - 2005 - Seasonal seismicity at western United States volcanic centers","interactions":[],"lastModifiedDate":"2019-05-02T09:32:06","indexId":"70027588","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","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":"Seasonal seismicity at western United States volcanic centers","docAbstract":"We examine 20-yr data sets of seismic activity from 10 volcanic areas in the western United States for annual periodic signals (seasonality), focusing on large calderas (Long Valley caldera and Yellowstone) and stratovolcanoes (Cascade Range). We apply several statistical methods to test for seasonality in the seismic catalogs. In 4 of the 10 regions, statistically significant seasonal modulation of seismicity (> 90% probability) occurs, such that there is an increase in the monthly seismicity during a given portion of the year. In five regions, seasonal seismicity is significant in the upper 3 km of the crust. Peak seismicity occurs in the summer and autumn in Mt. St. Helens, Hebgen Lake/Madison Valley, Yellowstone Lake, and Mammoth Mountain. In the eastern south moat of Long Valley caldera (LVC) peak seismicity occurs in the winter and spring. We quantify the possible external forcing mechanisms that could modulate seasonal seismicity. Both snow unloading and groundwater recharge can generate large stress changes of > 5 kPa at seismogenic depths and may thus contribute to seasonality. ?? 2005 Elsevier B.V. All rights reserved.","language":"English","publisher":"Elsevier","doi":"10.1016/j.epsl.2005.09.012","issn":"0012821X","usgsCitation":"Christiansen, L., Hurwitz, S., Saar, M., Ingebritsen, S.E., and Hsieh, P.A., 2005, Seasonal seismicity at western United States volcanic centers: Earth and Planetary Science Letters, v. 240, no. 2, p. 307-321, https://doi.org/10.1016/j.epsl.2005.09.012.","productDescription":"15 p.","startPage":"307","endPage":"321","numberOfPages":"15","costCenters":[{"id":615,"text":"Volcano Hazards Program","active":true,"usgs":true}],"links":[{"id":238199,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"volume":"240","issue":"2","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b88d7e4b08c986b316bc7","contributors":{"authors":[{"text":"Christiansen, L.B.","contributorId":37952,"corporation":false,"usgs":true,"family":"Christiansen","given":"L.B.","email":"","affiliations":[],"preferred":false,"id":414247,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Hurwitz, S.","contributorId":61110,"corporation":false,"usgs":true,"family":"Hurwitz","given":"S.","email":"","affiliations":[],"preferred":false,"id":414249,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Saar, M.O.","contributorId":26506,"corporation":false,"usgs":true,"family":"Saar","given":"M.O.","email":"","affiliations":[],"preferred":false,"id":414246,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Ingebritsen, S. E.","contributorId":8078,"corporation":false,"usgs":true,"family":"Ingebritsen","given":"S.","email":"","middleInitial":"E.","affiliations":[],"preferred":false,"id":414245,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Hsieh, P. A.","contributorId":40596,"corporation":false,"usgs":true,"family":"Hsieh","given":"P.","email":"","middleInitial":"A.","affiliations":[],"preferred":false,"id":414248,"contributorType":{"id":1,"text":"Authors"},"rank":5}]}} ,{"id":70029255,"text":"70029255 - 2005 - Seismic architecture and lithofacies of turbidites in Lake Mead (Arizona and Nevada, U.S.A.), an analogue for topographically complex basins","interactions":[],"lastModifiedDate":"2018-04-09T13:05:30","indexId":"70029255","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2451,"text":"Journal of Sedimentary Research","onlineIssn":"1938-3681","printIssn":"1527-1404","active":true,"publicationSubtype":{"id":10}},"title":"Seismic architecture and lithofacies of turbidites in Lake Mead (Arizona and Nevada, U.S.A.), an analogue for topographically complex basins","docAbstract":"Turbidites, which have accumulated in Lake Mead since completion of the Hoover Dam in 1935, have been mapped using high-resolution seismic and coring techniques. This lake is an exceptional natural laboratory for studying fine-grained turbidite systems in complex topographic settings. The lake comprises four relatively broad basins separated by narrow canyons, and turbidity currents run the full length of the lake. The mean grain size of turbidites is mostly coarse silt, and the sand content decreases from 11-30% in beds in the easternmost basin nearest the source to 3-14% in the central basins to 1-2% in the most distal basin. Regionally, the seismic amplitude mimics the core results and decreases away from the source. The facies and morphology of the sediment surface varies between basins and suggests a regional progression from higher-energy and possibly channelized flows in the easternmost basin to unchannelized flows in the central two basins to unchannelized flows that are ponded by the Hoover Dam in the westernmost basin. At the local scale, turbidites are nearly flat-lying in the central two basins, but here the morphology of the basin walls strongly affects the distribution of facies. One of the two basins is relatively narrow, and in sinuous sections reflection amplitude increases toward the outsides of meanders. Where a narrow canyon debouches into a broad basin, reflection amplitude decreases radially away from the canyon mouth and forms a fan-like deposit. The fine-grained nature of the turbidites in the most distal basin and the fact that reflections drape the underlying pre-impoundment surface suggest ponding here. The progression from ponding in the most distal basin to possibly channelized flows in the most proximal basin shows in plan view a progression similar to the stratigraphic progression documented in several minibasins in the Gulf of Mexico. Copyright ?? 2005, SEPM (Society for Sedimentary Geology).","largerWorkType":{"id":2,"text":"Article"},"largerWorkTitle":"Journal of Sedimentary Research","largerWorkSubtype":{"id":10,"text":"Journal Article"},"language":"English","doi":"10.2110/jsr.2005.011","issn":"15271404","usgsCitation":"Twichell, D., Cross, V., Hanson, A., Buck, B., Zybala, J., and Rudin, M., 2005, Seismic architecture and lithofacies of turbidites in Lake Mead (Arizona and Nevada, U.S.A.), an analogue for topographically complex basins: Journal of Sedimentary Research, v. 75, no. 1, p. 134-148, https://doi.org/10.2110/jsr.2005.011.","productDescription":"15 p.","startPage":"134","endPage":"148","costCenters":[{"id":678,"text":"Woods Hole Coastal and Marine Science Center","active":true,"usgs":true}],"links":[{"id":237873,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"}],"country":"United States","state":"Arizona, Nevada","otherGeospatial":"Lake Mead ","geographicExtents":"{\n \"type\": \"FeatureCollection\",\n \"features\": [\n {\n \"type\": \"Feature\",\n \"properties\": {},\n \"geometry\": {\n \"type\": \"Polygon\",\n \"coordinates\": [\n [\n [\n -114.9444580078125,\n 35.92909271208457\n ],\n [\n -113.90899658203125,\n 35.92909271208457\n ],\n [\n -113.90899658203125,\n 36.56260003738545\n ],\n [\n -114.9444580078125,\n 36.56260003738545\n ],\n [\n -114.9444580078125,\n 35.92909271208457\n ]\n ]\n ]\n }\n }\n ]\n}","volume":"75","issue":"1","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505b8af5e4b08c986b3174c3","contributors":{"authors":[{"text":"Twichell, D.C.","contributorId":84304,"corporation":false,"usgs":true,"family":"Twichell","given":"D.C.","affiliations":[],"preferred":false,"id":421941,"contributorType":{"id":1,"text":"Authors"},"rank":1},{"text":"Cross, V.A.","contributorId":88687,"corporation":false,"usgs":true,"family":"Cross","given":"V.A.","email":"","affiliations":[],"preferred":false,"id":421942,"contributorType":{"id":1,"text":"Authors"},"rank":2},{"text":"Hanson, A.D.","contributorId":10607,"corporation":false,"usgs":true,"family":"Hanson","given":"A.D.","email":"","affiliations":[],"preferred":false,"id":421937,"contributorType":{"id":1,"text":"Authors"},"rank":3},{"text":"Buck, B.J.","contributorId":35938,"corporation":false,"usgs":true,"family":"Buck","given":"B.J.","email":"","affiliations":[],"preferred":false,"id":421938,"contributorType":{"id":1,"text":"Authors"},"rank":4},{"text":"Zybala, J.G.","contributorId":59234,"corporation":false,"usgs":true,"family":"Zybala","given":"J.G.","email":"","affiliations":[],"preferred":false,"id":421939,"contributorType":{"id":1,"text":"Authors"},"rank":5},{"text":"Rudin, M.J.","contributorId":59235,"corporation":false,"usgs":true,"family":"Rudin","given":"M.J.","email":"","affiliations":[],"preferred":false,"id":421940,"contributorType":{"id":1,"text":"Authors"},"rank":6}]}} ,{"id":70029304,"text":"70029304 - 2005 - Hydrologic properties of coal-beds in the Powder River Basin, Montana: II. Aquifer test analysis","interactions":[],"lastModifiedDate":"2018-10-31T08:50:51","indexId":"70029304","displayToPublicDate":"2005-01-01T00:00:00","publicationYear":"2005","noYear":false,"publicationType":{"id":2,"text":"Article"},"publicationSubtype":{"id":10,"text":"Journal Article"},"seriesTitle":{"id":2342,"text":"Journal of Hydrology","active":true,"publicationSubtype":{"id":10}},"title":"Hydrologic properties of coal-beds in the Powder River Basin, Montana: II. Aquifer test analysis","docAbstract":"A multiple well aquifer test to determine anisotropic transmissivity was conducted on a coal-bed in the Powder River Basin, southeastern Montana, as part of a multidisciplinary investigation to determine hydrologic conditions of coal-beds in the area. For the test, three wells were drilled equidistant from and at different angles to a production well tapping the Flowers–Goodale coal seam, a 7.6-m thick seam confined at a depth of about 110 m. The test was conducted by air-lift pumping for 9 h, and water levels were monitored in the three observation wells using pressure transducers. Drawdown data collected early in the test were affected by interporosity flow between the coal fracture network and the matrix, but later data were suitable to determine aquifer anisotropy, as the slopes of the late-time semilog time-drawdown curves are nearly identical, and the zero-drawdown intercepts are different. The maximum transmissivity, trending N87°E, is 14.9 m2/d, and the minimum transmissivity 6.8 m2/d, giving an anisotropy ratio of 2.2:1. Combined specific storage of the fractures and matrix is 2×10−5/m, and of the fracture network alone 5×10−6/m. The principal direction of the anisotropy tensor is not aligned with the face cleats, but instead is aligned with another fracture set and with dominant east–west tectonic compression. Results of the test indicate that the Flowers–Goodale coal-bed is more permeable than many coals in the Powder River Basin, but the anisotropy ratio and specific storage are similar to those found for other coal-beds in the basin.
","language":"English","publisher":"Elsevier","doi":"10.1016/j.jhydrol.2004.11.002","issn":"00221694","usgsCitation":"Weeks, E., 2005, Hydrologic properties of coal-beds in the Powder River Basin, Montana: II. Aquifer test analysis: Journal of Hydrology, v. 308, no. 1-4, p. 242-257, https://doi.org/10.1016/j.jhydrol.2004.11.002.","productDescription":"16 p.","startPage":"242","endPage":"257","costCenters":[{"id":589,"text":"Toxic Substances Hydrology Program","active":true,"usgs":true}],"links":[{"id":237516,"rank":0,"type":{"id":24,"text":"Thumbnail"},"url":"https://pubs.usgs.gov/thumbnails/outside_thumb.jpg"},{"id":210557,"rank":9999,"type":{"id":10,"text":"Digital Object Identifier"},"url":"https://dx.doi.org/10.1016/j.jhydrol.2004.11.002"}],"country":"United States","state":"Montana","otherGeospatial":"Powder River Basin","volume":"308","issue":"1-4","noUsgsAuthors":false,"publicationStatus":"PW","scienceBaseUri":"505a3667e4b0c8380cd606ad","contributors":{"authors":[{"text":"Weeks, E.P.","contributorId":38514,"corporation":false,"usgs":true,"family":"Weeks","given":"E.P.","email":"","affiliations":[],"preferred":false,"id":422161,"contributorType":{"id":1,"text":"Authors"},"rank":1}]}} ]}