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Browse more than 160,000 publications authored by our scientists over the past 100+ year history of the USGS.  Publications available are: USGS-authored journal articles, series reports, book chapters, other government publications, and more.

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We are focused on some of the most significant issues society faces, and our science is making a substantial contribution to the well-being of the Nation and the world. Learn more about the major topics our research covers and the programs focused on those topics.

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Filter Total Items: 175538

Experimental warming alters free-living nitrogen fixation in a humid tropical forest Experimental warming alters free-living nitrogen fixation in a humid tropical forest

Microbial nitrogen (N) fixation accounts for c. 97% of natural N inputs to terrestrial ecosystems. These microbes can be free-living in the soil and leaf litter (asymbiotic) or in symbiosis with plants. Warming is expected to increase N-fixation rates because warmer temperatures favor the growth and activity of N-fixing microbes. We investigated the effects of warming on asymbiotic...
Authors
Parker M. Bartz, Iana F. Grullón-Penkova, Molly A. Cavaleri, Sasha C. Reed, Saima Shahid, Tana E. Wood, Benedicte Bachelot
By
Ecosystems Mission Area, Southwest Biological Science Center

Genetic and environmental factors associated with survival of a rare songbird in a fragmented urban landscape Genetic and environmental factors associated with survival of a rare songbird in a fragmented urban landscape

The coastal Cactus Wren (Campylorhynchus brunneicapillus) persists in small and fragmented populations throughout southern California that are subject to genetic drift and inbreeding. We combined individual banding and resighting data and genotyped individuals at 22 microsatellite loci to assess whether heterozygosity was associated with survival across three regional Cactus Wren...
Authors
Amy G. Vandergast, Anna Mitelberg, Barbara E. Kus, Kristine L. Preston, Suellen Lynn, Alexandra Houston, Robert C. Klinger
By
Ecosystems Mission Area, Western Ecological Research Center (WERC)

SURF: An automated method for building nonplanar 3D fault models from earthquake hypocenters SURF: An automated method for building nonplanar 3D fault models from earthquake hypocenters

Accurately characterizing 3D fault geometry is vital for improving our understanding of earthquake behavior and informing the development of seismic hazard models. Despite their importance, subsurface fault structures tend to be poorly constrained because of limitations in observational data. Improvements to the seismic networks and earthquake detection algorithms have increased the...
Authors
Travis Vincent Alongi, Austin J. Elliott, Robert J. Skoumal, David R. Shelly, Alexandra Elise Hatem
By
Natural Hazards Mission Area, Earthquake Hazards Program, Earthquake Science Center

Sea-level driven isolation of glacial plant refugia revealed by submerged lake sediment from the Bering Land Bridge and St. Matthew Island Sea-level driven isolation of glacial plant refugia revealed by submerged lake sediment from the Bering Land Bridge and St. Matthew Island

Bering Land Bridge (BLB) climate and vegetation during the Last Glacial Maximum (LGM) remains largely understudied, given challenges associated with collecting records from the submerged BLB. Previous records, confined to the margins of the modern land area and adjacent shelf, reveal conflicting interpretations of Beringian vegetation during the LGM. Here, we reconstruct LGM vegetation
Authors
Miriam C. Jones, Lesleigh Anderson, Beth Elaine Caissie, David J. Harning, Thomas A. Ager
By
Florence Bascom Geoscience Center

New maps of natural radioactivity reveal critical minerals and more New maps of natural radioactivity reveal critical minerals and more

High-resolution airborne radiometric surveys are covering more ground than ever to provide insights into unseen geology, mineral resource potential, and possible health hazards.
Authors
Anjana K. Shah, Daniel H. Doctor, Chloe Danielle Gustafson, Alan D. Pitts
By
Geology, Energy, and Minerals Mission Area, Mineral Resources Program, Florence Bascom Geoscience Center, Geology, Geophysics, and Geochemistry Science Center, Earth Mapping Resources Initiative (Earth MRI)

Mapping a Carrington storm Mapping a Carrington storm

A map is presented of median 1-min-resolution peak geoelectric-field strength across the United States as would be induced by magnetic storms as intense as the 2 September 1859 Carrington storm. The map is constructed from two data sets: Magnetometer time series from 22 ground-based observatories recording 40 magnetic storms, and surface impedance tensors derived from magnetotelluric...
Authors
Jeffrey J. Love, Greg M. Lucas, Anna Kelbert, E. Joshua Rigler, Paul A. Bedrosian, Neesha R. Schnepf
By
Geologic Hazards Science Center
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