Seismic hazard in the Intermountain West

Earthquake Spectra
By: , and 

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Abstract

The 2014 national seismic-hazard model for the conterminous United States incorporates new scientific results and important model adjustments. The current model includes updates to the historical catalog, which is spatially smoothed using both fixed-length and adaptive-length smoothing kernels. Fault-source characterization improved by adding faults, revising rates of activity, and incorporating new results from combined inversions of geologic and geodetic data. The update also includes a new suite of published ground motion models. Changes in probabilistic ground motion are generally less than 10% in most of the Intermountain West compared to the prior assessment, and ground-motion hazard in four Intermountain West cities illustrates the range and magnitude of change in the region. Seismic hazard at reference sites in Boise and Reno increased as much as 10%, whereas hazard in Salt Lake City decreased 5–6%. The largest change was in Las Vegas, where hazard increased 32–35%.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Seismic hazard in the Intermountain West
Series title Earthquake Spectra
DOI 10.1193/103114EQS173M
Volume 31
Issue S1
Year Published 2015
Language English
Publisher Earthquake Engineering Research Institute
Contributing office(s) Geologic Hazards Science Center
Description 28 p.
First page S149
Last page S176