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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 82,000 reports authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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Gulf Coast Prairie Landscape Conservation Cooperative regional hypotheses of ecological responses to flow alteration Gulf Coast Prairie Landscape Conservation Cooperative regional hypotheses of ecological responses to flow alteration
No abstract available.
Authors
Mary Davis, Shannon K. Brewer
Gully monitoring at two locations in the Grand Canyon National Park, Arizona, 1996-2010, with emphasis on documenting effects of the March 2008 high-flow experiment Gully monitoring at two locations in the Grand Canyon National Park, Arizona, 1996-2010, with emphasis on documenting effects of the March 2008 high-flow experiment
Many archeological sites in the Grand Canyon are being impacted by gully incision. In March 2008, a high-flow experiment (2008 HFE) was conducted with the intention of redistributing fine sediment (sand, silt, and clay) from the bed of the Colorado River to higher elevations along the channel margin. Deposition of fine sediment in gully mouths has been hypothesized to slow gully erosion...
Authors
Nathan D. Schott, Joseph E. Hazel, Helen C. Fairley, Matt Kaplinski, Roderic A. Parnell
Gunnison sage-grouse lek site suitability modeling Gunnison sage-grouse lek site suitability modeling
In order to better understand and protect species with minimal or decreasing populations, it is imperative to determine their actual existing population size. The focal species for this project is the Gunnison sage-grouse (GUSG), which became a proposed endangered species under the Endangered Species Act, thus confirming the need for better population estimates. Lek site counting during...
Authors
Douglas S. Ouren, Drew A. Ignizio, Melissa Siders, Theresa Childers, Karen Tucker, Nathan Seward
Hawaiian hoary bat occupancy at Kaloko-Honokōhau National Historical Park Hawaiian hoary bat occupancy at Kaloko-Honokōhau National Historical Park
Hawaiian hoary bat (Lasiurus cinereus semotus) vocalizations were recorded using Anabat SD1 and Song Meter SM2Bat ultrasonic recorders at four monitoring stations in Kaloko-Honokōhau National Historical Park on the island of Hawai‘i. We hypothesize that echolocation call events are more numerous during the reproductive season of this bat. Bat detectors recorded from 1700 to 0730 hrs on a...
Authors
Frank J. Bonaccorso, Corina Pinzari, Kristina Montoya-Aiona
High-resolution digital elevation model of Mount St. Helens crater and upper North Fork Toutle River basin, Washington, based on an airborne lidar survey of September 2009 High-resolution digital elevation model of Mount St. Helens crater and upper North Fork Toutle River basin, Washington, based on an airborne lidar survey of September 2009
The lateral blast, debris avalanche, and lahars of the May 18th, 1980, eruption of Mount St. Helens, Washington, dramatically altered the surrounding landscape. Lava domes were extruded during the subsequent eruptive periods of 1980–1986 and 2004–2008. More than three decades after the emplacement of the 1980 debris avalanche, high sediment production persists in the North Fork Toutle...
Authors
Adam R. Mosbrucker
High-resolution geophysical data collected aboard the U.S. Geological Survey research vessel Rafael to supplement existing datasets from Buzzards Bay and Vineyard Sound, Massachusetts High-resolution geophysical data collected aboard the U.S. Geological Survey research vessel Rafael to supplement existing datasets from Buzzards Bay and Vineyard Sound, Massachusetts
Geophysical and geospatial data were collected in Buzzards Bay, in the shallow-water areas of Vineyard Sound, and in the nearshore areas off the eastern Elizabeth Islands and northern coast of Martha's Vineyard, Massachusetts, on the U.S. Geological Survey research vessel Rafael between 2007 and 2011, in a collaborative effort between the U.S. Geological Survey and the Massachusetts...
Authors
Elizabeth A. Pendleton, Brian D. Andrews, William W. Danforth, David S. Foster
High-resolution swath interferometric data collected within Muskeget Channel, Massachusetts High-resolution swath interferometric data collected within Muskeget Channel, Massachusetts
Swath interferometric bathymetery data were collected within and around Muskeget Channel and along select nearshore areas south and east of Martha's Vineyard, Massachusetts. Data were collected aboard the U.S. Geological Survey research vessel Rafael in October and November 2010 in a collaborative effort between the U.S. Geological Survey and the Woods Hole Oceanographic Institution...
Authors
Elizabeth A. Pendleton, Jane F. Denny, William W. Danforth, Wayne E. Baldwin, Barry J. Irwin
High-resolution topography and geomorphology of select archeological sites in Glen Canyon National Recreation Area, Arizona High-resolution topography and geomorphology of select archeological sites in Glen Canyon National Recreation Area, Arizona
Along the Colorado River corridor between Glen Canyon Dam and Lees Ferry, Arizona, located some 25 km downstream from the dam, archaeological sites dating from 8,000 years before present through the modern era are located within and on top of fluvial and alluvial terraces of the prehistorically undammed river. These terraces are known to have undergone significant erosion and retreat...
Authors
Brian D. Collins, Skye C. Corbett, Joel B. Sankey, Helen C. Fairley
Histograms showing variations in oil yield, water yield, and specific gravity of oil from Fischer assay analyses of oil-shale drill cores and cuttings from the Piceance Basin, northwestern Colorado Histograms showing variations in oil yield, water yield, and specific gravity of oil from Fischer assay analyses of oil-shale drill cores and cuttings from the Piceance Basin, northwestern Colorado
Recent studies indicate that the Piceance Basin in northwestern Colorado contains over 1.5 trillion barrels of oil in place, making the basin the largest known oil-shale deposit in the world. Previously published histograms display oil-yield variations with depth and widely correlate rich and lean oil-shale beds and zones throughout the basin. Histograms in this report display oil-yield...
Authors
John D. Dietrich, Michael E. Brownfield, Ronald C. Johnson, Tracey J. Mercier
Historical and contemporary imagery to assess ecosystem change on the Arctic coastal plain of northern Alaska Historical and contemporary imagery to assess ecosystem change on the Arctic coastal plain of northern Alaska
The Arctic Coastal Plain of northern Alaska is a complex landscape of lakes, streams, and wetlands scattered across low-relief tundra that is underlain by permafrost. This region of the Arctic has experienced a warming trend over the past three decades leading to thawing of on-shore permafrost and the disappearance of sea ice at unprecedented rates. The U.S. Geological Survey’s (USGS)...
Authors
Ken D. Tape, John M. Pearce, Dennis H. Walworth, Brandt W. Meixell, Tom F. Fondell, David D. Gustine, Paul L. Flint, Jerry W. Hupp, Joel A. Schmutz, David H. Ward
Historical and projected climate (1901–2050) and hydrologic response of karst aquifers, and species vulnerability in south-central Texas and western South Dakota Historical and projected climate (1901–2050) and hydrologic response of karst aquifers, and species vulnerability in south-central Texas and western South Dakota
Two karst aquifers, the Edwards aquifer in the Balcones Escarpment region of south-central Texas and the Madison aquifer in the Black Hills of western South Dakota, were evaluated for hydrologic response to projected climate change through 2050. Edwards aquifer sites include Barton Springs, the Bexar County Index Well, and Comal Springs. Madison aquifer sites include Spearfish Creek and...
Authors
John F. Stamm, Mary F. Poteet, Amy J. Symstad, MaryLynn Musgrove, Andrew J. Long, Barbara Mahler, Parker A. Norton
Historical channel-planform change of the Little Colorado River near Winslow, Arizona Historical channel-planform change of the Little Colorado River near Winslow, Arizona
This study evaluates channel-planform adjustment on an alluvial reach of the Little Colorado River and documents the geomorphic evolution of the channel through an analysis of aerial photographs and orthophotographs for the period 1936–2010. The Little Colorado River has adjusted to the effects of an extreme flood in 1923 and a subsequent decline in peak discharge and mean annual flow by...
Authors
Debra L. Block