Earthquake Hazards

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The USGS monitors and reports on earthquakes, assesses earthquake impacts and hazards, and conducts targeted research on the causes and effects of earthquakes. We undertake these activities as part of the larger National Earthquake Hazards Reduction Program (NEHRP), a four-agency partnership established by Congress.

Latest Earthquakes

Latest Earthquakes

Latest earthquakes map and list (past 24 hours, M2.5+) from the ANSS (Advanced National Seismic System). Check out the new interface! (7/27/20)

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Auroras and Earthquakes: Strange Companions

Auroras and Earthquakes: Strange Companions

In a win-win situation for both seismologists and space physicists, a cheap magnetometer at a seismic station can result in better seismic data for earthquakes and also more geomagnetic data in real time for monitoring space weather.

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News

Date published: August 10, 2020

Salton Sea Earthquake Activity Returns to Normal Levels

Reduced activity for the swarm of earthquakes beneath the Salton Sea that began on August 10, 2020.
Last update: 08/14/2020 12pm Pacific

Date published: August 9, 2020

Magnitude 5.1 Earthquake Near Sparta, North Carolina

A magnitude 5.1 earthquake struck near Sparta, North Carolina August 9, 2020 at 8:07 a.m. Eastern Daylight Time. Seismic instruments indicate the earthquake originated at a depth of about 2.3 miles. The USGS currently estimates there is a low likelihood of casualties or damage from this earthquake.

Date published: August 3, 2020

A Research Retrospective: Offshore Fault Mapping of the San Andreas

Study of New Offshore Fault Mapping Related to the 1906 San Francisco Earthquake:  In 2019, for the first time ever, scientists comprehensively mapped a previously overlooked offshore section of the San Andreas Fault system which may provide insight on how the fault could rupture in the future.

Publications

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Year Published: 2020

Calibration of the U.S. Geological Survey National Crustal Model

The U.S. Geological Survey National Crustal Model (NCM) is being developed to include spatially varying estimates of site response in seismic hazard assessments. Primary outputs of the NCM are continuous velocity and density profiles from the Earth’s surface to the mantle transition zone at 410-kilometer (km) depth for each location on a 1-km grid...

Boyd, Oliver S.
Boyd, O.S., 2020, Calibration of the U.S. Geological Survey National Crustal Model: U.S. Geological Survey Open-File Report 2020–1052, 23 p., https://doi.org/10.3133/ofr20201052.

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Year Published: 2020

Citizen science collaboration with the U.S. Geological Survey in Alaska

Citizen science is science undertaken by the public, usually in collaboration with professional scientific institutions. It encourages citizens to tackle real-world scientific problems and augments traditional science by expanding the coverage of data collection and by reducing costs of fieldwork in remote locations. Information collected by...

Powers, Elizabeth; Williams, Dee
Powers, E.M., and Williams, D.M., 2020, Citizen science collaboration with the U.S. Geological Survey in Alaska: U.S. Geological Survey Fact Sheet 2020-3026, 2 p., https://doi.org/10.3133/fs20203026.

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Year Published: 2020

Global quieting of high-frequency seismic noise due to COVID-19 pandemic lockdown measures

Human activity causes vibrations that propagate into the ground as high-frequency seismic waves. Measures to mitigate the COVID-19 pandemic caused widespread changes in human activity, leading to a months-long reduction in seismic noise of up to 50%. The 2020 seismic noise quiet period is the longest and most prominent global anthropogenic seismic...

Lecocq, Thomas; Hicks, Stephen; Van Noten, Koen; van Wijk, Kasper; Koelemeijer, Paula; De Plaen, Raphael S.M.; Massin, Frederick; Hillers, Gregor; Anthony, Robert E.; Apoloner, Maria-Theresia; Arroyo-Solorzano, Mario; Assink, Jelle D.; Buyukakpinar, Pinar; Cannata, Andrea; Cannavo, Flavio; Carrasco, Sebastian; Caudron, Corentin; Chaves, Esteban J.; Cornwell, David G.; Craig, David; den Ouden, Oliver F.C.; Diaz, Jordi; Donner, Stefanie; Evangelidis, Christos P.; Evers, Laslo; Fauville, Benoit; Fernandez, Gonzalo A.; Giannopoulos, Dimitrios; Gibbons, Steven J.; Girona, Tarsilo; Grecu, Bogdan; Grunberg, Marc; Hetenyi, Gyorgy; Horleston, Anna; Inza, Adolfo; Irving, Jessica C.E.; Jamalreyhani, Mohammadreza; Kafka, Alan; Koymans, Mathijs R.; Labedz, Celeste; Larose, Eric; Lindsey, Nathaniel J.; McKinnon, Mika; Megies, Tobias; Miller, Meghan S.; Minarik, William G.; Moresi, Louis; Marquez-Ramirez, Victor H.; Mollhoff, Martin; Nesbitt, Ian; Niyogi, Shankho; Ojeda, Javier; Oth, Adrien; Proud, Simon; Pulli, Jay; Retailleau, Lise; Rintamaki, Annukka E.; Satriano, Claudio; Savage, Martha K.; Shani-Kamiel, Shanhar; Sleeman, Reinoud; Sokos, Efthimios; Stammler, Klaus; Stott, Alexander E.; Subedi, Shiba; Sorensen, Mathilde B.; Taira, Taka'aki; Tapia, Mar; Turhan, Faith; van der Pluijm, Ben; Vanstone, Mark; Vernge, Jerome; Vuorinen, Tommi A.T.; Warren, Tristram; Wassermann, Joachim; Xiao, Han