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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The Saudi Geological Survey-U.S. Geological Survey northern Harrat Rahat project—Styles, rates, causes, and hazards of volcanism near Al Madīnah al Munawwarah, Kingdom of Saudi Arabia
Active volcanic systems pose serious hazards to people and property including inundation and incineration by lava, blanketing by tephra (volcanic ash), exposure to noxious volcanic gases, and damage from shallow earthquakes triggered by ascending molten material (magma). To improve understanding of volcanism and associated seismicity on the western Arabia Plate, the Saudi Geological Survey and the
Authors
Thomas W. Sisson, Andrew T. Calvert, Walter D. Mooney
Active volcanism on the Arabian Shield—Geology, volcanology, and geophysics of northern Harrat Rahat and vicinity, Kingdom of Saudi Arabia
Active volcanic systems pose serious hazards to people and property including inundation and incineration by lava, blanketing by tephra (volcanic ash), exposure to noxious volcanic gases, and damage from shallow earthquakes triggered by ascending molten material (magma). To improve understanding of volcanism and associated seismicity on the western Arabia Plate, the Saudi Geological Survey and the
Conservation plan for golden eagles in eastern North America
No abstract available.
Authors
Todd E. Katzner, Tricia A. Miller, Andrew J. Dennhardt, Maxwell Field, Thomas Wittig, Elizabeth Mojica, Michael J. Lanzone, Mark S. Martell, Richard M. Bailey, Andrew Berry, Renee Dillard, David Brandes, David F. Brinker, Bracken Brown, Erynn M. Call, Jeffrey Cooper, Adam E. Duerr, Christopher J Farmer, Shilo K. Felton, Julie Garvin, Rolf Gubler, Sergio R. Harding, Michael Jones, Christine A. Kelly, Hardy Kern, Netawn Kiogima, Craig A. Koppie, Jerome Lemaitre, Mercedes Maddox, Scott Mehus, Joel Merriman, Amy Mitchell, Bill Parsons, Evan Patrick, Nora P. Pennarola, Margaret Rheude, Casey Rucker, Scott Rush, Ryan Schmitz, Hank Seltzer, Vincent A. Slabe, Eric C. Soehren, Johnny Wills
Evaluation of stream capture related to groundwater pumping, Lower Humboldt River Basin, Nevada
The Humboldt River Basin is the only river basin that is contained entirely within the State of Nevada. The effect of groundwater pumping on the Humboldt River is not well understood. Tools are needed to determine stream capture and manage groundwater pumping in the Humboldt River Basin. The objective of this study is to estimate capture and storage change caused by groundwater withdrawals in the
Authors
Cara A. Nadler, Susan C. Rybarski, Hai Pham
Groundwater discharge by evapotranspiration from the Amargosa Wild and Scenic River and contributing areas, Inyo and San Bernardino Counties, California
The Amargosa Wild and Scenic River, located in the southwestern Mojave Desert in Inyo and San Bernardino Counties, California, is a Federally protected waterway that supports the biodiversity of the region. Water in the river primarily comes from interbasin groundwater flow that originates as precipitation in the Spring Mountains. The precipitation enters the regional groundwater system and flows
Authors
Michael T. Pavelko, Nancy A. Damar
Preparing for future changes: Louisiana's Coast
Cooperator publication summarizing USGS publications in collaboration with Water Institute that are being used to inform Louisiana coastal policy.
Authors
Timothy Carruthers, Camille Stagg, Melissa Millman Baustian
Gap analysis: A proposed methodology to describe and map historical and contemporary populations and habitats
This is a methodology paper that describes an approach for modeling and mapping historical and contemporary spawning areas for coregonine fishes in the Laurentian Great Lakes. Coregonines are a family of native whitefishes and ciscoes that are now greatly reduced or extirpated, but once served important roles for both the food web and society. This method can illustrate where habitats once existed
Authors
Cory Brant, Karen M Alofs, Chris Castiglione, Susan E. Doka, Alexander T. Duncan, Dave Fielder, Matthew Herbert, Arunas Liskauskus, Edward S. Rutherford, Jason Smith, Ralph W. Tingley, Ted Treska, Ted Turschak, Cindy Chu, Peter C. Esselman
Prediction of the probability of elevated nitrate concentrations at groundwater depths used for drinking-water supply in the Puget Sound basin, Washington, 2004–19
The Puget Sound basin encompasses the 13,700-square-mile area that drains to the Puget Sound and the adjacent marine waters of Washington State. Well more than 4 million people live within the basin, with numbers continuing to increase, who rely on the basin’s natural resources including groundwater. The Puget Sound Partnership was created by a Washington State statute to implement a science-based
Authors
Robert W. Black, Elise E. Wright, Valerie A.L. Bright, Alex O. Headman
Changes in phosphorus and suspended solids loading in the Fox River, northeastern Wisconsin, 1989–2021
The entire Lower Fox River and inner bay of Green Bay, in northeastern Wisconsin, have been listed as impaired by the Wisconsin Department of Natural Resources (WDNR) for low dissolved oxygen and degraded habitat, with total phosphorus (TP) and total suspended solids (TSS) concentrations listed as the likely causes of these impairments. To restore the Fox River and Green Bay, total maximum daily l
Authors
Dale M. Robertson, Matthew W. Diebel, Sarah L. Bartlett, Kevin J. Fermanich
Creating an updated vegetation map for Big Oaks National Wildlife Refuge: Final report
Although Big Oaks NWR encompasses much diversity in wildlife species, an up-to-date, detailed, and comprehensive map showing vegetation types was lacking. The creation of an updated vegetation map for Big Oaks NWR was approved in early 2019. Digital aerial imagery was collected on November 1, 2019 at a resolution of 0.15 meter per pixel using four spectral bands: red, green, blue, and near infrare
Authors
Erin E. Hoy
Automated construction of Streamflow-Routing networks for MODFLOW—Application in the Mississippi Embayment region
In humid regions with dense stream networks, surface water exerts a fundamental control on the water levels and flow directions of shallow groundwater. Understanding interactions between groundwater and surface water is critical for managing groundwater resources and groundwater-dependent ecosystems. Representing streams in groundwater models has historically been arduous and error prone. In recen
Authors
Andrew T. Leaf
Simulating groundwater flow in the Mississippi Alluvial Plain with a focus on the Mississippi Delta
The Mississippi Alluvial Plain has become one of the most important agricultural regions in the United States but relies heavily on groundwater for irrigation. On average, more than 12 billion gallons are withdrawn daily from the Mississippi River Valley alluvial aquifer. Declining groundwater levels, especially in the Delta region of northwest Mississippi and the Cache and Grand Prairie regions o
Authors
Andrew T. Leaf, Leslie L. Duncan, Connor J. Haugh, Randall J. Hunt, James R. Rigby