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Browse more than 65,000 articles 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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HydroBench: Jupyter supported reproducible hydrological model benchmarking and diagnostic tool HydroBench: Jupyter supported reproducible hydrological model benchmarking and diagnostic tool

Evaluating whether hydrological models are right for the right reasons demands reproducible model benchmarking and diagnostics that evaluate not just statistical predictive model performance but also internal processes. Such model benchmarking and diagnostic efforts will benefit from standardized methods and ready-to-use toolkits. Using the Jupyter platform, this work presents HydroBench...
Authors
Edom Moges, Benjamin Ruddell, Liang Zhang, Jessica M. Driscoll, Parker A. Norton, Fernando Perez, Laurel Larsen

Geologic models underpinning the 2018 US Geological Survey assessment of hydrocarbon resources in the Eagle Ford Group and associated Cenomanian–Turonian strata, United States Gulf Coast, Texas Geologic models underpinning the 2018 US Geological Survey assessment of hydrocarbon resources in the Eagle Ford Group and associated Cenomanian–Turonian strata, United States Gulf Coast, Texas

The availability of new geologic and production data has greatly increased since 2010, when the US Geological Survey (USGS) last assessed undiscovered, technically recoverable oil and gas resources in the Cenomanian–Turonian (CT) Eagle Ford Group (EFG) across Texas. This new information facilitated an updated assessment of undiscovered continuous oil and gas resources in the Eagle Ford...
Authors
Katherine J. Whidden, Janet K. Pitman, Heidi M. Leathers-Miller, Ofori N. Pearson, Nicholas J. Gianoutsos, Scott A. Kinney, Justin E. Birdwell, Stanley T. Paxton, Lauri A. Burke, Russell F. Dubiel

Modflow-setup: Robust automation of groundwater model construction Modflow-setup: Robust automation of groundwater model construction

In an age of both big data and increasing strain on water resources, sound management decisions often rely on numerical models. Numerical models provide a physics-based framework for assimilating and making sense of information that by itself only provides a limited description of the hydrologic system. Often, numerical models are the best option for quantifying even intuitively obvious
Authors
Andrew T. Leaf, Michael N. Fienen

Early in mission Landsat 9 geometric performance Early in mission Landsat 9 geometric performance

Landsat 9 (L9) was launched on September 27, 2021, from Vandenberg Space Force Base in California. The U. S. Geological Survey (USGS) released Level-1 data, geometrically orthorectified and radiometrically calibrated imagery in digital numbers that can be scaled to Top-of-Atmosphere reflectance, and Level-2 data, geometrically orthorectified and radiometrically calibrated surface...
Authors
Michael J. Choate, Rajagopalan Rengarajan, Nahid Hasan

Guide for interpreting and reporting luminescence dating results Guide for interpreting and reporting luminescence dating results

The development and application of luminescence dating and dosimetry techniques have grown exponentially in the last several decades. Luminescence methods provide age control for a broad range of geological and archaeological contexts and can characterize mineral and glass properties linked to geologic origin, Earth-surface processes, and past exposure to light, heat, and ionizing...
Authors
Shannon A. Mahan, Tammy M. Rittenour, Michelle S. Nelson, Nina Ataee, Nathan D. Brown, Regina DeWitt, Julie Durcan, Mary Evans, James K. Feathers, Marine Frouin, Guillaume Guerin, Maryam Heydari, Sebastien Huot, Mayank Jain, Amanda Keen-Zebert, Bo Li, Gloria I. Lopez, Christina Neudorf, Naomi Porat, Kathleen Rodrigues, Andre O. Sawakuchi, Joel Q. G Spencer, Kristina Thomsen

Projected stream fish community risk to climate impacts in the Northeastern and Midwestern United States Projected stream fish community risk to climate impacts in the Northeastern and Midwestern United States

Climate change is expected to alter stream fish habitat potentially leading to changes in the composition and distribution of fish communities. In the Northeastern and Midwestern United States we identified the distribution and characteristics of those fish communities most and least at risk of experiencing changes in climate which deviate from the climate they are associated with. We...
Authors
Nicholas Sievert, Craig P. Paukert, J. B. Whittier, Wesley Daniel, D.M. Infante, Jana S. Stewart

What to expect when you are expecting earthquake early warning What to expect when you are expecting earthquake early warning

We present a strategy for earthquake early warning (EEW) alerting that focuses on providing users with a target level of performance for their shaking level of interest (for example, ensuring that users receive warnings for at least 95 per cent of the occurrences of that shaking level). We explore the factors that can affect the accuracy of EEW shaking forecasts including site conditions...
Authors
Sarah E. Minson, Elizabeth S. Cochran, Jessie Kate Saunders, Sara K. McBride, Stephen Wu, Annemarie S. Baltay, Kevin R. Milner

A generically parameterized model of Lake eutrophication: The impact of Stoichiometric ratios and constraints on the abundance of natural phytoplankton communities (GPLake-S) A generically parameterized model of Lake eutrophication: The impact of Stoichiometric ratios and constraints on the abundance of natural phytoplankton communities (GPLake-S)

Water quality improvement to avoid excessive phytoplankton blooms often requires eutrophication management where both phosphorus (P) and nitrogen (N) play a role. While empirical eutrophication studies and ecological resource competition theory both provide insight into phytoplankton abundance in response to nutrient loading, they are not seamlessly linked in the current state of...
Authors
Manqi Chang, Donald L. DeAngelis, Jan H. Janse, Annette B.G. Janssen, Tineke A. Troost, Dianneke van Wijk, Wolf M. Mooij, Sven Teurlincx

Measuring and attributing sedimentary and geomorphic responses to modern climate change: Challenges and opportunities Measuring and attributing sedimentary and geomorphic responses to modern climate change: Challenges and opportunities

Today, climate change is affecting virtually all terrestrial and nearshore settings. This commentary discusses the challenges of measuring climate-driven physical landscape responses to modern global warming: short and incomplete data records, land use and seismicity masking climatic effects, biases in data availability and resolution, and signal attenuation in sedimentary systems. We...
Authors
Amy E. East, Jonathan A. Warrick, Dongfeng Li, Joel B. Sankey, Margaret H. Redsteer, Ann E. Gibbs, Jeffrey A. Coe, Patrick L. Barnard

Simulating burn severity maps at 30 meters in two forested regions in California Simulating burn severity maps at 30 meters in two forested regions in California

Climate change is altering wildfire behavior and vegetation regimes in California’s forested ecosystems. Present day fires are seeing an increase in high burn severity area and high severity patch size. The ability to predict future burn severity patterns would support better policy and land management decisions. Here we demonstrate a methodology to first, statistically estimate...
Authors
Jonathan A. Sam, W. Jonathan Baldwin, Anthony LeRoy Westerling, Haiganoush K. Preisler, Qingqing Xu, Matthew D. Hurteau, Benjamin M. Sleeter, Samrajya B. Thapa

Defining the timing, extent, and conditions of Paleozoic metamorphism in the southern Appalachian Blue Ridge terranes of Tennessee, North Carolina, and northern Georgia Defining the timing, extent, and conditions of Paleozoic metamorphism in the southern Appalachian Blue Ridge terranes of Tennessee, North Carolina, and northern Georgia

The tectonometamorphic evolution of the southern Appalachians, which results from multiple Paleozoic orogenies (Taconic, Neoacadian, and Alleghanian), has lacked a consensus interpretation regarding its thermal-metamorphic history. The Blue Ridge terranes have remained the focus of the debate, with the interpreted timing of regional Barrovian metamorphism and associated deformation...
Authors
J. Ryan Thigpen, David P. Moecher, Harold H. Stowell, Arthur J. Merschat, Robert D. Hatcher, Nicholas Edwin Powell, Brandon M. Spencer, Calvin A. Mako, Elizabeth M. Bollen, Andrew R C Kylander-Clark

Ceratocystis lukuohia-infested ambrosia beetle frass as inoculum for Ceratocystis wilt of ʻōhiʻa (Metrosideros polymorpha) Ceratocystis lukuohia-infested ambrosia beetle frass as inoculum for Ceratocystis wilt of ʻōhiʻa (Metrosideros polymorpha)

Metrosideros polymorpha (‘ōhi‘a) trees in Hawaiʻi are dying from two distinct diseases, collectively referred to as rapid ‘ōhi‘a death (ROD), caused by Ceratocystis lukuohia and Ceratocystis huliohia. Boring dust (frass) released when ambrosia beetles attack and colonize infected trees has been suspected as a transmission source. We sampled ambrosia beetle frass from six locations on...
Authors
Marc A Hughes, Kylle Roy, Thomas C Harrington, Eva Brill, Lisa M Keith
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