Reports
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
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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USA National Phenology Network gridded products documentation USA National Phenology Network gridded products documentation
The goals of the USA National Phenology Network (USA-NPN, www.usanpn.org) are to advance science, inform decisions, and communicate and connect with the public regarding phenology and species’ responses to environmental variation and climate change. The USA-NPN seeks to facilitate informed ecosystem stewardship and management by providing phenological information freely and openly. One...
Authors
Theresa M. Crimmins, R. Lee Marsh, Jeff R. Switzer, Michael A. Crimmins, Katharine L. Gerst, Alyssa H. Rosemartin, Jake F. Weltzin
Hydrology and water quality in 13 watersheds in Gwinnett County, Georgia, 2001–15 Hydrology and water quality in 13 watersheds in Gwinnett County, Georgia, 2001–15
The U.S. Geological Survey (USGS), in cooperation with Gwinnett County Department of Water Resources, established a Long-Term Trend Monitoring (LTTM) program in 1996. The LTTM program is a comprehensive, long-term, water-quantity and water-quality monitoring program designed to document and analyze the hydrologic and water-quality conditions of selected watersheds in Gwinnett County...
Authors
Brent T. Aulenbach, John K. Joiner, Jaime A. Painter
Early action to address an emerging wildlife disease Early action to address an emerging wildlife disease
A deadly fungal pathogen, Batrachochytrium salamandrivorans (Bsal) that affects amphibian skin was discovered during a die-off of European fire salamanders (Salamandra salamandra) in 2014. This pathogen has the potential to worsen already severe worldwide amphibian declines. Bsal is a close relative to another fungal disease known as Batrachochytrium dendrobatidis (Bd). Many scientists...
Authors
M. J. Adams, M. Camille Harris, Daniel A. Grear
Processing and review interface for strong motion data (PRISM) software, version 1.0.0—Methodology and automated processing Processing and review interface for strong motion data (PRISM) software, version 1.0.0—Methodology and automated processing
A continually increasing number of high-quality digital strong-motion records from stations of the National Strong-Motion Project (NSMP) of the U.S. Geological Survey (USGS), as well as data from regional seismic networks within the United States, call for automated processing of strong-motion records with human review limited to selected significant or flagged records. The NSMP has...
Authors
Jeanne Jones, Erol Kalkan, Christopher Stephens
Systematic comparisons between PRISM version 1.0.0, BAP, and CSMIP ground-motion processing Systematic comparisons between PRISM version 1.0.0, BAP, and CSMIP ground-motion processing
A series of benchmark tests was run by comparing results of the Processing and Review Interface for Strong Motion data (PRISM) software version 1.0.0 to Basic Strong-Motion Accelerogram Processing Software (BAP; Converse and Brady, 1992), and to California Strong Motion Instrumentation Program (CSMIP) processing (Shakal and others, 2003, 2004). These tests were performed by using the...
Authors
Erol Kalkan, Christopher Stephens
Hydrogeologic and geochemical characterization and evaluation of two arroyos for managed aquifer recharge by surface infiltration in the Pojoaque River Basin, Santa Fe County, New Mexico, 2014–15 Hydrogeologic and geochemical characterization and evaluation of two arroyos for managed aquifer recharge by surface infiltration in the Pojoaque River Basin, Santa Fe County, New Mexico, 2014–15
In order to provide long-term storage of diverted surface water from the Rio Grande as part of the Aamodt water rights settlement, managed aquifer recharge by surface infiltration in Pojoaque River Basin arroyos was proposed as an option. The initial hydrogeologic and geochemical characterization of two arroyos located within the Pojoaque River Basin was performed in 2014 and 2015 in...
Authors
Andrew J. Robertson, Jeffrey Cordova, Andrew Teeple, Jason Payne, Rob Carruth
Cooperative Fish and Wildlife Research Units Program—2016 year in review Cooperative Fish and Wildlife Research Units Program—2016 year in review
Summary The Cooperative Fish and Wildlife Research Units (CRU) Program had a productive year in 2016. Despite vacancies in our scientist ranks exceeding 20 percent, our research, training, and teaching portfolio was full and we graduated 93 students and published 398 manuscripts primarily focused on addressing the real conservation challenges of our cooperators. As I’ve stated before...
Authors
John F. Organ, John D. Thompson, Donald E. Dennerline, Dawn E. Childs
Cooperative Fish and Wildlife Research Units Program—2016 year in review postcard Cooperative Fish and Wildlife Research Units Program—2016 year in review postcard
Cooperative Fish and Wildlife Research Units Program—2016 Year in Review postcard This postcard provides details about the Cooperative Fish and Wildlife Research Units (CRU) Program—2016 Year in Review, Circular 1424. This Circular provides information relating to fish and wildlife science, students, staffing, vacancies, research funding, outreach and training, science themes, background...
Authors
John F. Organ, John D. Thompson, Don E. Dennerline, Dawn E. Childs
Record-high specific conductance and water temperature in San Francisco Bay during water year 2015 Record-high specific conductance and water temperature in San Francisco Bay during water year 2015
The San Francisco estuary is commonly defined to include San Francisco Bay (bay) and the adjacent Sacramento–San Joaquin River Delta (delta). The U.S. Geological Survey (USGS) has operated a high-frequency (15-minute sampling interval) water-quality monitoring network in San Francisco Bay since the late 1980s (Buchanan and others, 2014). This network includes 19 stations at which...
Authors
Paul A. Work, Maureen A. Downing-Kunz, Daniel N. Livsey
Characterization of streamflow, suspended sediment, and nutrients entering Galveston Bay from the Trinity River, Texas, May 2014–December 2015 Characterization of streamflow, suspended sediment, and nutrients entering Galveston Bay from the Trinity River, Texas, May 2014–December 2015
The U.S. Geological Survey (USGS), in cooperation with the Texas Water Development Board and the Galveston Bay Estuary Program, collected streamflow and water-quality data at USGS streamflow-gaging stations in the lower Trinity River watershed from May 2014 to December 2015 to characterize and improve the current understanding of the quantity and quality of freshwater inflow entering...
Authors
Zulimar Lucena, Michael T. Lee
Analysis of trends of water quality and streamflow in the Blackstone, Branch, Pawtuxet, and Pawcatuck Rivers, Massachusetts and Rhode Island, 1979 to 2015 Analysis of trends of water quality and streamflow in the Blackstone, Branch, Pawtuxet, and Pawcatuck Rivers, Massachusetts and Rhode Island, 1979 to 2015
Trends in long-term water-quality and streamflow data from six water-quality-monitoring stations within three major river basins in Massachusetts and Rhode Island that flow into Narragansett Bay and Little Narragansett Bay were evaluated for water years 1979–2015. In this study, conducted by the U.S. Geological Survey in cooperation with the Rhode Island Department of Environmental...
Authors
Jennifer G. Savoie, John R. Mullaney, Gardner C. Bent
Assessment of Permian coalbed gas resources of the Karoo Basin Province, South Africa and Lesotho, 2016 Assessment of Permian coalbed gas resources of the Karoo Basin Province, South Africa and Lesotho, 2016
Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 5.27 trillion cubic feet of coalbed gas in the Karoo Basin Province.
Authors
Christopher J. Schenk, Michael E. Brownfield, Marilyn E. Tennyson, Timothy R. Klett, Tracey J. Mercier, Sarah J. Hawkins, Stephanie B. Gaswirth, Kristen R. Marra, Thomas M. Finn, Phuong A. Le, Heidi M. Leathers-Miller