Earthquake Hazards


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). Tap/click on "gear icon" for options and settings.

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Glen Avon Earthquake Swarm 5/25/2019-?

Glen Avon Earthquake Swarm 5/25/2019-?

The Pasadena field office along with Caltech has been monitoring and reporting on a swarm of small earthquakes that began in the Glen Avon area, southwest of Fontana on May 25.

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Explore the Earthquake Hazards Program

Latest and historical earthquakes, hazards information, educational resources, maps, seismographic stations and real-time recording, current research in plain language, data, software and derived products.

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Date published: May 26, 2019

Magnitude 8.0 Earthquake in Peru

A magnitude 8.0 earthquake struck north-central Peru on May 26, 2019 at 2:41 am local time (07:41 UTC). 

Date published: May 17, 2019

MEDIA ADVISORY: Low-Level Flights in Charleston to Image Buried Faults and Ancient Lava Flows

Editor:  In the public interest and in accordance with Federal Aviation Administration regulations, the USGS is announcing this low-level airborne project.  Your assistance in informing the local communities is appreciated.

Date published: April 30, 2019

Study of Alaskan Landslide Could Improve Tsunami Modeling

A rare submarine landslide provides researchers with a reference point for modeling the biggest tsunamis. (EOS article)


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Year Published: 2019

Determining Moho depth beneath sedimentary basins using regional Pn multiples

The study of the Moho beneath thick sedimentary basins involving natural earthquakes is challenging, as low‐velocity materials often cause strong reverberations that mask Moho signals. Here, we develop a method to determine the depth of the Moho by taking advantage of the presence of the sediments. The method utilizes the first Pn crustal multiple...

Yu, C.; Zhan, Z.; Hauksson, E.; Cochran, Elizabeth S.; Helmberger, D.

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Year Published: 2019

Event detection performance of the PLUM earthquake early warning algorithm in southern California

We test the Japanese ground‐motion‐based earthquake early warning (EEW) algorithm, propagation of local undamped motion (PLUM), in southern California with application to the U.S. ShakeAlert system. In late 2018, ShakeAlert began limited public alerting in Los Angeles to areas of expected modified Mercalli intensity (⁠IMMI⁠) 4.0+ for magnitude 5.0...

Cochran, Elizabeth S.; Bunn, Julian; Minson, Sarah E.; Baltay, Annemarie S.; Kilb, Deborah L.; Kodera, Y.; Hoshiba, Mitsuyuki

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Year Published: 2019

Data Report: Permeability, porosity, and frictional strength of core samples from IODP Expedition 366 in the Mariana forearc

Core samples from the International Ocean Discovery Program (IODP) Expedition 366 were tested in the laboratory to determine permeability, porosity, density, and frictional strength and their relation to mineralogy as part of an effort to understand hydro-mechanical processes at convergent plate margins. Seven samples were tested from a depth...

Morrow, Carolyn A.; Moore, Diane E.; Lockner, David A.; Bekins, Barbara A.
 Morrow, C.A., Moore, D.E., Lockner, D.A., and Bekins, B.A., 2019. Data report: permeability, porosity, and frictional strength of core samples from IODP Expedition 366 in the Mariana forearc. In Fryer, P., Wheat, C.G., Williams, T., and the Expedition 366 Scientists, Mariana Convergent Margin and South Chamorro Seamount. Proceedings of the International Ocean Discovery Program, 366: College Station, TX (International Ocean Discovery Program).