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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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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 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.

Date published: October 17, 2018

The Hayward Fault—Is It Due for a Repeat of the Powerful 1868 Earthquake?

By Thomas M. Brocher, Jack Boatwright, James J. Lienkaemper, Carol S. Prentice, David P. Schwartz, and Howard Bundock

Drawn from: USGS Fact Sheet 2018-3052

Publications

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.

Year Published: 2019

Two-dimensional seismic velocities and structural variations at three British Columbia Hydro and Power Authority (BC Hydro) dam sites, Vancouver Island, British Columbia, Canada

SummaryIn June, 2017, we acquired seismic data along five linear profiles at three British Columbia Hydro and Power Authority (BC Hydro, a Canadian provincial Crown Corporation) dam sites (John Hart, Ladore, and Strathcona Dams) on Vancouver Island, British Columbia, Canada. We also attempted to acquire linear seismic profiles at two additional BC...

Catchings, Rufus D.; Addo, Kofi O.; Goldman, Mark R.; Chan, Joanne H.; Sickler, Robert R.; Criley, Coyn J.
Catchings, R.D., Addo, K.O., Goldman, M.R., Chan, J.H., Sickler, R.R., and Criley, C.J., 2019, Two-dimensional seismic velocities and structural variations at three British Columbia Hydro and Power Authority (BC Hydro) dam sites, Vancouver Island, British Columbia, Canada: U.S. Geological Survey Open-File Report 2019–1015, 125 p., https://doi.org/10.3133/ofr20191015.