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.

 

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Latest Earthquakes

Latest earthquakes map and list (past 24 hours, M2.5+) from the ANSS (Advanced National Seismic System). Tap/click on "gear icon" for options and settings.

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New tsunami evidence along one of Earth’s largest faults

New tsunami evidence along one of Earth’s largest faults

Recent geological studies of a key section of the Aleutian Island chain of Alaska suggest Aleutian tsunamis may occur more frequently than previously understood.

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News

Date published: March 25, 2019

USGS Seeks Earthquake Hazards Research Proposals

Applications due May 29, 2019

Date published: March 5, 2019

New tsunami evidence along one of Earth’s largest faults, the Alaska-Aleutian megathrust

Recent geological studies of a key section of the Aleutian Island chain of Alaska suggest Aleutian tsunamis may occur more frequently than previously understood.

Date published: November 30, 2018

2018 Anchorage Earthquake

A magnitude 7.0 earthquake struck north of Anchorage, Alaska, on November 30, 2018, at 8:29 a.m. local time (17:29:28 UTC).  For the most up-to-date information, please visit the USGS event page, and for estimates of casualties and damage, visit the USGS Prompt Assessment of Global Earthquakes for Response (PAGER) website.

Publications

Year Published: 2019

Stratigraphic and structural relations in trench exposures and geomorphology at the Big Burn, Lily Lake, and Lester Ranch sites, Bear River Fault Zone, Utah and Wyoming

This report provides trench photomosaics, logs and related site information, age data, and earthquake event evidence from three paleoseismic trench sites on the Bear River Fault Zone. Our motivation for studying the Bear River Fault Zone—a nascent normal fault in the Rocky Mountains east of the Basin and Range physiographic province—is twofold: (1...

Hecker, Suzanne; Duross, Christopher; Schwartz, David P.; Cinti, Francesca R.; Civico, Riccardo; Lund, William R.; Hiscock, Adam I.; West, Michael W.; Wilcox, Tarka; Stoller, Alivia R.
Hecker, S., DuRoss, C.B., Schwartz, D.P., Cinti, F.R., Civico, R., Lund, W.R., Hiscock, A.I., West, M.W., Wilcox, T., and Stoller, A.R., 2019, Stratigraphic and structural relations in trench exposures and geomorphology at the Big Burn, Lily Lake, and Lester Ranch sites, Bear River Fault Zone, Utah and Wyoming: U.S. Geological Survey Scientific Investigations Map 3430, 8 p., 3 sheets, https://doi.org/10.3133/sim3430.

Year Published: 2019

The Mw 6.0 South Napa earthquake of August 24, 2014—Observations of surface faulting and ground deformation, with recommendations for improving post-earthquake field investigations

The Mw 6.0 South Napa earthquake of August 24, 2014, produced complex and extensive surface faulting and other ground deformation features. Following the event, geologists made more than 1,200 field observations at locations where tectonic faulting and ground failure produced visible deformation that fractured and disturbed the ground surface. At...

Ponti, Daniel J.; Rosa, Carla M.; Blair, James Luke
Ponti, D.J, Rosa, C.M, and Blair, J.L., 2019, The Mw 6.0 South Napa earthquake of August 24, 2014—Observations of surface faulting and ground deformation, with recommendations for improving post-earthquake field investigations: U.S. Geological Survey Open-File Report 2019–1018, 50 p., 15 appendixes, https://doi.org/10.3133/ofr20191018.

Year Published: 2019

Seismic hazard assessment at the Fallon, Nevada, Frontier Observatory for Research in Geothermal Energy site

Enhanced geothermal systems (EGS) technology aims to engineer a productive geothermal reservoir in regions of hot, but low permeability, rocks. In any EGS operation, the rock mass requires stimulation by high pressure injection of fluids, which has the potential to induce seismicity. To address the seismic hazard specifically, a probabilistic...

Kaven, J. Ole; Majer, Ernest L.; Foxall, William; Sonnenthal, Eric L.; Pettitt, William
Kaven, J.O., Majer, E.L., Foxall, W., Sonnenthal, E.L., Pettitt, W., 2019, Seismic hazard assessment at the Fallon, Nevada, Frontier Observatory for Research in Geothermal Energy site: U.S. Geological Survey Open-File Report 2019–1020, 16 p., https://doi.org/10.3133/ofr20191020.