Seismic hazard in the eastern United States
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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.
Study Area
| 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 |
| Google Analytic Metrics | Metrics page |