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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 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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Impact of climate change on mollusks and other invertebrate resources at the Dominican University of California archaeological site (CA-MRN-254), Marin County, California Impact of climate change on mollusks and other invertebrate resources at the Dominican University of California archaeological site (CA-MRN-254), Marin County, California
We have identified and provided ecological interpretations of 30 taxa recovered at two shellmounds at the Dominican University of California archaeology site in Marin County, California (CA-MRN-254). A Q-mode cluster analysis was used to group the samples according to their faunal similarity. The clusters ranged from a diverse grouping of 100 samples with 27 taxa (Cluster A) to those...
Authors
Mary McGann, Charles L. Powell
Multiple agricultural cropland products of South Asia developed using Landsat-8 30 m and MODIS 250 m data using machine learning on the Google Earth Engine (GEE) cloud and spectral matching techniques (SMTs) in support of food and water security Multiple agricultural cropland products of South Asia developed using Landsat-8 30 m and MODIS 250 m data using machine learning on the Google Earth Engine (GEE) cloud and spectral matching techniques (SMTs) in support of food and water security
Cropland products are of great importance in water and food security assessments, especially in South Asia, which is home to nearly 2 billion people and 230 million hectares of net cropland area. In South Asia, croplands account for about 90% of all human water use. Cropland extent, cropping intensity, crop watering methods, and crop types are important factors that have a bearing on the...
Authors
Murali Krishna Gumma, Prasad Thenkabail, Pranay Panjala, Pardhasaradhi Teluguntla, Takashi Yamano, Ismail Mohammad
Martian gully activity and the gully sediment transport system Martian gully activity and the gully sediment transport system
The formation process for Martian gullies is a critical unknown for understanding recent climate conditions. Leading hypotheses include formation by snowmelt in a past climate, or formation via currently active CO2 frost processes. This paper presents an expanded catalog of >300 recent flows in gullies. The results indicate that sediment transport in current gully flows moves the full...
Authors
Colin M. Dundas, Susan J. Conway, Glen E. Cushing
Can we accurately estimate sediment budgets on Mars? Can we accurately estimate sediment budgets on Mars?
Sediment budgets are fundamentally important for planetary science. However, only one primary method, based on remote sensing, is currently available for determining extraterrestrial sediment budgets. For determining sediment budgets on Earth, both in-situ and remote sensing methods are available. Despite the widespread use of the two methods, there has been surprisingly little research...
Authors
Joel B. Sankey, Alan Kasprak, Matthew Chojnacki, Timothy N. Titus, Joshua Caster, Geoffrey DeBenedetto
Quantifying interdependencies in geyser eruptions at the Upper Geyser Basin, Yellowstone National Park Quantifying interdependencies in geyser eruptions at the Upper Geyser Basin, Yellowstone National Park
The Upper Geyser Basin at Yellowstone National Park (Wyoming, USA) harbors the greatest concentration of geysers worldwide. Research suggests that individual geysers are not isolated but rather are hydraulically connected in the subsurface with other geysers and thermal springs. To quantify such connections, we combined techniques from machine learning, causal inference, and dynamical...
Authors
William F. Fagan, Anshuman Swain, Amitava Banerjee, Hamir Ranade, Peter Thompson, Phillip P. A. Staniczenko, Barrett Flynn, Jefferson Hungerford, Shaul Hurwitz
Trout responses to stocking rates and river discharge within a southeast U.S. hydropeaking tailwater Trout responses to stocking rates and river discharge within a southeast U.S. hydropeaking tailwater
Freshwater fish populations often exist in systems characterized by novel ecological processes resulting from human alteration. Salmonid populations embedded within coldwater sections of warmwater rivers are spatially constrained by habitat availability. Tailwater fish contend with fluctuating river discharges and density-dependent processes associated with fish stocking and exploitation...
Authors
Jonathan J. Spurgeon, Joseph Kaiser, Christy Graham, Steve Lochmann
Upper-plate structure and tsunamigenic faults near the Kodiak Islands, Alaska, USA Upper-plate structure and tsunamigenic faults near the Kodiak Islands, Alaska, USA
The Kodiak Islands lie near the southern terminus of the 1964 Great Alaska earthquake rupture area and within the Kodiak subduction zone segment. Both local and trans-Pacific tsunamis were generated during this devastating megathrust event, but the local tsunami source region and the causative faults are poorly understood. We provide an updated view of the tsunami and earthquake hazard...
Authors
Marlon D. Ramos, Lee M Liberty, Peter J. Haeussler, Robert John Humphreys
Virtual special issue of recent advances on gas hydrates scientific drilling in Alaska Virtual special issue of recent advances on gas hydrates scientific drilling in Alaska
Gas hydrate refers to a non-stoichiometric clathrate that forms spontaneously in the natural environment whenever sufficient quantities of gases of appropriate size (most commonly methane) interact with abundant water under specific conditions of temperature and pressure. (1,2) Such conditions occur wherever the shallow geothermal gradient has been suppressed by either deepwater or thick
Authors
Ray Boswell, Koji Yamamoto, Timothy S. Collett, Norihiro Okinaka
Revisiting the 1899 earthquake series using integrative geophysical analysis in Yakutat Bay, Alaska Revisiting the 1899 earthquake series using integrative geophysical analysis in Yakutat Bay, Alaska
A series of large earthquakes in 1899 affected southeastern Alaska near Yakutat and Disenchantment Bays. The largest of the series, a MW 8.2 event on 10 September 1899, generated an ~12-m-high tsunami and as much as 14.4 m of coseismic uplift in Yakutat Bay, the largest coseismic uplift ever measured. Several complex fault systems in the area are associated with the Yakutat terrane...
Authors
Maureen A. L. Walton, Sean P.S. Gulick, Peter J. Haeussler
African penguins and localized fisheries management: Response to Butterworth and Ross-Gillespie African penguins and localized fisheries management: Response to Butterworth and Ross-Gillespie
We present a response to Butterworth and Ross-Gillespie's (2022) comment on our perspectives on how forage fish fisheries are impacting the endangered African penguin (Sphenicus demersus), and corresponding management options. Butterworth and Ross-Gillespie overstate model uncertainties and downplay the clear ecological and conservation significance of the fisheries closure experiment...
Authors
Bill Sydeman, Gene Hunt, E.K. Pikitch, J. Parrish, John F. Piatt, D. Boersma, L. Kaufman, D. L. Anderson, S. Thompson, Richard B. Sherley
Revisiting 228Th as a tool for determining sedimentation and mass accumulation rates Revisiting 228Th as a tool for determining sedimentation and mass accumulation rates
The use of 228Th has seen limited application for determining sedimentation and mass accumulation rates in coastal and marine environments. Recent analytical advances have enabled rapid, precise measurements of particle-bound 228Th using a radium delayed coincidence counting system (RaDeCC). Herein we review the 228Th cycle in the marine environment and revisit the historical use of...
Authors
Joseph Tamborski, Pinghe Cai, Meagan J. Eagle, Paul Henderson, Matthew Charette
The North American tree-ring fire-scar network The North American tree-ring fire-scar network
Fire regimes in North American forests are diverse and modern fire records are often too short to capture important patterns, trends, feedbacks, and drivers of variability. Tree-ring fire scars provide valuable perspectives on fire regimes, including centuries-long records of fire year, season, frequency, severity, and size. Here, we introduce the newly compiled North American tree-ring...
Authors
Ellis Q. Margolis, Christopher H. Guiterman, Raphael Chavardes, Jonathan D. Coop, Kelsey Copes-Gerbitz, Denyse A. Dawe, Donald A. Falk, James D. Johnston, Evan Larson, Hangkyo Lim, Joseph M. Marschall, Cameron E. Naficy, Adam T. Naito, Marc-André Parisien, Sean A. Parks, Jeanne Portier, Helen M. Poulos, Kevin M. Robertson, James H. Speer, Michael C. Stambaugh, Thomas W. Swetnam, Alan J. Tepley, Ichchha Thapa, Craig D. Allen, Yves Bergeron, Lori D. Daniels, Peter Z. Fule, David Gervais, Martin P. Girardin, Grant L. Harley, Jill E. Harvey, Kira M. Hoffman, Jean M. Huffman, Matthew D. Hurteau, Lane B. Johnson, Charles W. Lafon, Manuel K. Lopez, R. Stockton Maxwell, Jed Meunier, Malcolm North, Monica T. Rother, Micah R. Schmidt, Rosemary L. Sherriff, Lauren A. Stachowiak, Alan H. Taylor, Erana J. Taylor, Valerie Trouet, Miguel L. Villarreal, Larissa L. Yocom, Karen B. Arabas, Alexis H. Arizpe, Dominique Arseneault, Alicia Azpeleta Tarancon, Christopher H. Baisan, Erica Bigio, Franco Biondi, Gabriel D. Cahalan, Anthony C. Caprio, Julian Cerano-Paredes, Brandon M. Collins, Daniel C. Dey, Igor Drobyshev, Calvin A. Farris, M. Adele Fenwick, William T. Flatley, M. Lisa Floyd, Ze’ev Gedalof, Andres Holz, Lauren F. Howard, David W. Huffman, Jose Iniguez, Kurt F. Kipfmueller, Stanley G Kitchen, Keith Lombardo, Donald McKenzie, Andrew G. Merschel, Kerry L. Metlen, Jesse Minor, Christopher D. O'Connor, Laura Platt, William J. Platt, Thomas Saladyga, Amanda B. Stan, Scott L. Stephens, Colleen Sutheimer, Ramzi Touchan, Peter J. Weisberg