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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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Mechanics and statistics of postseismic shaking Mechanics and statistics of postseismic shaking

Analysis of two weeks of continuous post-seismic shaking after the 2019 M7.1 Ridgecrest, CA earthquake sequence using 4 nearby borehole seismometers reveals that continuous ground motions decay as Omori’s law in time and follow the Gutenberg-Richter distribution in logarithmic amplitude. The measured temporal decay in amplitudes agrees with predictions of the rate-and-state framework and...
Authors
Timothy Hugh Clements, Elizabeth S. Cochran, Sarah E. Minson, Nicholas van der Elst, Clara Yoon, Annemarie S. Baltay Sundstrom, Morgan T. Page
By
Natural Hazards Mission Area, Earthquake Hazards Program, Earthquake Science Center

Airborne radiometric data map alteration of porphyry copper systems in the Elkhorn district, MT Airborne radiometric data map alteration of porphyry copper systems in the Elkhorn district, MT

The Elkhorn district in southwestern Montana is known for past production of high-grade base and precious metals from skarn and carbonate replacement deposits. The district also hosts a porphyry Cu-Mo deposit. A radiometric survey flown over the district and surrounds provides maps of surficial concentrations of potassium, thorium, and uranium. Handheld gamma ray spectrometer...
Authors
Eric D. Anderson, Kaleb Scarberry, Kyle Eastman, Jonathan Andrew Funk, Benjamin Patrick Magnin, Joseph Clevenger, John Dilles, Jarred L. Zimmerman, Snir Attia, Michael Cosca
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Tracing fluid evolution during batholith and deposit formation: In-situ and bulk rock Mo isotopes from the Questa porphyry Mo deposit, New Mexico, USA Tracing fluid evolution during batholith and deposit formation: In-situ and bulk rock Mo isotopes from the Questa porphyry Mo deposit, New Mexico, USA

The Oligocene Questa porphyry Mo deposit, located in New Mexico, USA, is a well-characterized system that formed over 400 kyr, punctuating the 8 Myr formation of the Questa-Latir batholith. Detailed sampling of the intrusions and minerals associated with magmatichydrothermal mineralization, as well as bookending barren intrusions, allows for examination of the Mo isotope record of the...
Authors
Sean Patrick Gaynor, Nicolas D. Greber, Qasid Ahmad, Pia Künzi, Ingo Horn, Stefan Weyer
By
Mineral Resources Program, Geology, Geophysics, and Geochemistry Science Center

Did they feel it? Legacy maroseismic data illuminates an engimatic 20th century earthquake Did they feel it? Legacy maroseismic data illuminates an engimatic 20th century earthquake

The challenges and the importance of preserving legacy instrumental records of earthquakes are now well-recognized (e.g., Richards & Hellweg, 2020, https://doi.org/10.1785/0220200053). Seismologists may not be aware of parallel challenges and opportunities with legacy macroseismic data for earthquakes in the United States. For much of the 20th century, macroseismic data were collected by...
Authors
Susan E. Hough, Lori Dengler, Robert McPherson, Lijam Hagos, Margaret Hellweg
By
Natural Hazards Mission Area, Earthquake Hazards Program, Earthquake Science Center

Shear surface undulations modulate clayey gouge strength and contribute to divergent landslide acceleration Shear surface undulations modulate clayey gouge strength and contribute to divergent landslide acceleration

Landslides display a spectrum of speeds for incompletely known reasons. Sliding occurs along slickensided undulatory shear surfaces within boundary shear gouge. Laboratory tests reveal that gouge shear strength generally decreases with finite cumulative displacement during relatively rapid failure and may increase or decrease with increasing shear rate; these behaviors can result in...
Authors
William H. Schulz, Gonghui Wang, Yao Jiang, Brian D. Collins, Mark E. Reid, Mason Muir Einbund
By
Geologic Hazards Science Center

A comparison of deep-sea coral and sponge species distribution models and the impact of ocean currents in the Southern California Bight A comparison of deep-sea coral and sponge species distribution models and the impact of ocean currents in the Southern California Bight

Deep-sea corals and sponges (DSCS) are signature taxa of deep-water habitats, but ecological mechanisms that drive their geographic distributions can be difficult to uncover due to the challenges of surveying deep-water ecosystems and limited oceanographic data. A comparison of species distribution models was made for three DSCS (Antipathes dendochristos, Plumarella longispina, and an...
Authors
Nissa Kreidler, Andre Buchheister, David D. Huff, Jerome Fiechter, Mary Yoklavich, Mark J. Henderson
By
Cooperative Research Units
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