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Earthquake Hazards Program

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.

News

The Loneliest Seismometers on Earth

The Loneliest Seismometers on Earth

Updates for ShakeAlert False Alert for M5.9 Earthquake near Carson City, NV (Dec. 2025)

Updates for ShakeAlert False Alert for M5.9 Earthquake near Carson City, NV (Dec. 2025)

USGS releases aftershock forecast for M8.8 Russian Kamchatka Peninsula Earthquake

USGS releases aftershock forecast for M8.8 Russian Kamchatka Peninsula Earthquake

Publications

Compact seismicity bursts have different characteristics from regional seismicity Compact seismicity bursts have different characteristics from regional seismicity

Earthquakes tend to cluster, developing into sequences driven by stress perturbations and transient fault-zone processes. Depending on the driving process, earthquake sequences show differing behaviors. This variability challenges our ability to observe or distinguish these driving processes in high resolution. Here we systematically identify seismicity bursts throughout southern...
Authors
Nicolas DeSalvio, Wenyuan Fan, Andrew J. Barbour, Jeanne L. Hardebeck

Constraining source and path effects of large magnitude earthquakes using ground motion simulations Constraining source and path effects of large magnitude earthquakes using ground motion simulations

The purpose of this study is to use ground‐motion simulations to investigate ways in which source and path effects for large‐magnitude earthquakes can be represented in nonergodic ground‐motion models (GMMs). To achieve this, we designed a ground‐motion study in the San Francisco Bay Area that includes earthquakes with a broad range of magnitudes distributed uniformly on a fault plane...
Authors
Xiaofeng Meng, Robert Graves, Christine A Goulet

Science

Geologic Mapping for Landscape Resiliency in California, Oregon, and Washington

This project uses geologic and geomorphic mapping in the context of societally relevant problems in the Earth’s critical zone. Leveraging interdisciplinary research ties and interagency collaborations, it utilizes remote sensing data, corroborated with field observations, to determine i) the spatial distribution of geomorphic processes and ages of Quaternary deposits in the context of active...
Geologic Mapping for Landscape Resiliency in California, Oregon, and Washington

Geologic Mapping for Landscape Resiliency in California, Oregon, and Washington

This project uses geologic and geomorphic mapping in the context of societally relevant problems in the Earth’s critical zone. Leveraging interdisciplinary research ties and interagency collaborations, it utilizes remote sensing data, corroborated with field observations, to determine i) the spatial distribution of geomorphic processes and ages of Quaternary deposits in the context of active...
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Mapping the grid: The United States Magnetotelluric Array

The United States has been mapped from space to the ground across its surface; however never from the perspective of the planet’s own electrical heartbeat. Over nearly two decades, the United States Magnetotelluric Array quietly marched across the country, station by station, building the first-ever electrical portrait of the crust and upper mantle beneath the contiguous U.S. An ambitious, multi...
Mapping the grid: The United States Magnetotelluric Array

Mapping the grid: The United States Magnetotelluric Array

The United States has been mapped from space to the ground across its surface; however never from the perspective of the planet’s own electrical heartbeat. Over nearly two decades, the United States Magnetotelluric Array quietly marched across the country, station by station, building the first-ever electrical portrait of the crust and upper mantle beneath the contiguous U.S. An ambitious, multi...
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2025 PRVI NSHM Rollout & User-Needs Meeting

In conjunction with publication of the 2025 Puerto Rico and U.S. Virgin Islands (PRVI) National Seismic Hazard Model (NSHM), the USGS National Seismic Hazard Model Project (NSHMP) will host a one-day public meeting in San Juan, Puerto Rico. Additional meeting information, including a link to the registration form, is provided below.
2025 PRVI NSHM Rollout & User-Needs Meeting

2025 PRVI NSHM Rollout & User-Needs Meeting

In conjunction with publication of the 2025 Puerto Rico and U.S. Virgin Islands (PRVI) National Seismic Hazard Model (NSHM), the USGS National Seismic Hazard Model Project (NSHMP) will host a one-day public meeting in San Juan, Puerto Rico. Additional meeting information, including a link to the registration form, is provided below.
Learn More

Multimedia

An image sequence to show the collapse of the natural bridge, Punta Ventana, Puerto Rico
Collapsed natural arch of Punta Ventana, Guayanilla, Puerto Rico
Collapsed natural arch of Punta Ventana, Guayanilla, Puerto Rico
2025 USGS National Seismic Hazard Model for Puerto Rico and U.S. Virgin Islands Chance of Damaging Shaking Map
2025 USGS National Seismic Hazard Model for Puerto Rico and U.S. Virgin Islands Chance of Damaging Shaking Map
2025 USGS National Seismic Hazard Model for Puerto Rico and U.S. Virgin Islands Chance of Damaging Shaking Map
10 Largest Earthquakes Ever Recorded
10 Largest Earthquakes Ever Recorded (Updated 2025)
10 Largest Earthquakes Ever Recorded (Updated 2025)
Deep Ice Seismometer Thumbnail Deep Ice Seismometer Thumbnail
World's deepest seismometer braces the South Pole!
USGS Rob Anthony sets up equipment in a freezer to test a Seismometer.
Testing the Deep Ice Seismometer
Testing the Deep Ice Seismometer
A group assembling a seismometer at the Physical Sciences Laboratory.
IceCube 2025-08-07TW 1279
IceCube 2025-08-07TW 1279
A photo of the seismometer being assembled.
IceCube 2025-08-07TW 0578
IceCube 2025-08-07TW 0578
Assembling a seismometer at the Physical Sciences Laboratory in Stoughton.
IceCube 2025-08-07TW 0407
IceCube 2025-08-07TW 0407
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