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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

The digital archivist: Automating legacy macroseismic data processing using large language models The digital archivist: Automating legacy macroseismic data processing using large language models

Macroseismic data are a key resource to investigate shaking and damage from preinstrumental and early instrumental eras. However, data are often stored as inconsistently formatted reports describing observed shaking and damage, making manually parsing and interpreting accounts labor‐intensive. We introduce a novel workflow using Google’s Gemini 2.5 Pro large language model (LLM) to...
Authors
Aarnav Agrawal, Susan E. Hough, Mostafa Mousavi, Margaret Hellweg, William Ellsworth, Clara Yoon, Salvador Blanco

Cascadia Subduction Zone science: Call for the next generation community seismic velocity model Cascadia Subduction Zone science: Call for the next generation community seismic velocity model

The Cascadia subduction zone (CSZ) hosts major seismic and tsunami hazards, yet key questions persist about the relationship between margin structure, fluid distribution, episodic tremor and slip, shallow megathrust behavior, shaking and tsunamigenesis, and the resulting hazard estimates. Addressing these problems requires an empirically grounded, three‐dimensional seismic velocity model...
Authors
Valerie J. Sahakian, Asif Ashraf, Charity Mann, Pieter-Ewald Share-MacParland, Rasheed Ajala, Jonathan Delph, Bin He, Emilie Hooft, Alex R. Grant, William J. Stephenson, Erin A. Wirth, Amanda Thomas, Diego Melgar, Jill Elizabeth

A ground-motion model derived using a generalized mean rupture distance for large slab interface earthquakes A ground-motion model derived using a generalized mean rupture distance for large slab interface earthquakes

Source–station distance is a central input to ground‐motion models (GMMs) for predicting seismic shaking. GMM development uses distance metrics including the Joyner–Boore distance, which is the shortest distance from an observation point to the surface projection of the earthquake rupture, and Rrup the shortest distance to the rupture in three dimensions. Thompson and Baltay (2018)...
Authors
Jessica R. Murray, Grace Alexandra Parker

Science

Challenges and Advances in Stable Continental Region Paleoseismology

Thursday and Friday, September 17-18, 2026 8:30 am - 4:30 pm CDT A Hybrid Event at The University of Memphis FedEx Institute of Technology
Challenges and Advances in Stable Continental Region Paleoseismology

Challenges and Advances in Stable Continental Region Paleoseismology

Thursday and Friday, September 17-18, 2026 8:30 am - 4:30 pm CDT A Hybrid Event at The University of Memphis FedEx Institute of Technology
Learn More

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...
Learn More

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...
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
Assembling a seismometer at the Physical Sciences Laboratory in Stoughton.
IceCube 2025-08-07TW 0407
IceCube 2025-08-07TW 0407
A photo of the seismometer being assembled.
IceCube 2025-08-07TW 0578
IceCube 2025-08-07TW 0578
A group assembling a seismometer at the Physical Sciences Laboratory.
IceCube 2025-08-07TW 1279
IceCube 2025-08-07TW 1279
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