Alaska Seismic Hazard Map

Science Center Objects

The National Seismic Hazard Maps developed by the USGS show the spatial probability of peak earthquake-driven ground motion levels. Since the last revisions to the map for Alaska in 2007, scientists have made significant advances in understanding active faulting, fault slip rates, and fault behavior.

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We are working to update the National Seismic Hazard Map for Alaska with the past decade of new science in response to requests from the state’s engineering and geotechnical communities. Production of the maps involves 1) developing a seismic hazard source model, 2) specifying a ground motion model, and 3) calculating the probabilities. For this task, Alaska-based personnel focus on the development of the seismic hazard source model. We are working to incorporate all updates to the Quaternary fault and fold database previously published by the Alaska Department of Geological and Geophysical Surveys, and expand the existing database with detailed information about fault geometry and slip rate, especially for offshore structures.

Map of Alaska with red lines

Image of Alaska fault model under development in the geographic information systems environment.
(Credit: Adrian Bender, USGS, Alaska Science Center. Public domain.)