Seismic hazard in the eastern United States

Earthquake Spectra
By: , and 

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Abstract

The U.S. Geological Survey seismic hazard maps for the central and eastern United States were updated in 2014. We analyze results and changes for the eastern part of the region. Ratio maps are presented, along with tables of ground motions and deaggregations for selected cities. The Charleston fault model was revised, and a new fault source for Charlevoix was added. Background seismicity sources utilized an updated catalog, revised completeness and recurrence models, and a new adaptive smoothing procedure. Maximum-magnitude models and ground motion models were also updated. Broad, regional hazard reductions of 5%–20% are mostly attributed to new ground motion models with stronger near-source attenuation. The revised Charleston fault geometry redistributes local hazard, and the new Charlevoix source increases hazard in northern New England. Strong increases in mid- to high-frequency hazard at some locations—for example, southern New Hampshire, central Virginia, and eastern Tennessee—are attributed to updated catalogs and/or smoothing.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Seismic hazard in the eastern United States
Series title Earthquake Spectra
DOI 10.1193/110414EQS182M
Volume 31
Issue S1
Year Published 2015
Language English
Publisher Earthquake Engineering Research Institute
Publisher location Berkeley
Contributing office(s) Geologic Hazards Science Center
Description 23 p.
First page 85
Last page 107
Country United States
Other Geospatial eastern United States
Online Only (Y/N) N
Additional Online Files (Y/N) N