Earthquake Hazards


Request for Hazard Modeling Contributions

The USGS requests that the earthquake hazard community bring to our attention new earthquake source and ground motion data or models that could be included in the National Seismic Hazard Model (NSHM) updates. In addition, workshops are held for feedback and comments. The next update of the NSHM for the conterminous U.S. (CONUS) will be in 2023.

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Seismic hazard map of U.S. with colored contours

2018 Long-term National Seismic Hazard Map. Earthquake hazard map showing peak ground accelerations having a 2 percent probability of being exceeded in 50 years, for a firm rock site.  The map is based on the most recent USGS models for the conterminous U.S. (2018), Hawaii (1998), and Alaska (2007).  The models are based on seismicity and fault-slip rates, and take into account the frequency of earthquakes of various magnitudes.  Locally, the hazard may be greater than shown, because site geology may amplify ground motions. (Public domain.)

Learn About Earthquake Hazards
What do I need to know about earthquake hazards? What does "earthquake hazard" mean? What are hazard maps?

Interactive fault map and comprehensive geologically based information on known or suspected active faults and folds in the United States. Also, generalized fault data used in the hazard maps.

Seismic Hazard Maps and Site-Specific Data
U.S. Seismic Hazard Maps, hazard tools, and other products.

Design Ground Motions
Ground motion parameter values for the design of buildings, bridges, and other structures.

Earthquake Scenarios
Earthquake scenarios describe the expected ground motions and effects of specific hypothetical large earthquakes.

Workshops are conducted periodically for input into the hazards products.