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Seismic-Hazard Maps for the Conterminous United States, 2008

Scientific Investigations Map 3195

Prepared in cooperation with the California Geological Survey
By:
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Abstract

Probabilistic seismic-hazard maps were prepared for the conterminous United States portraying peak horizontal acceleration and horizontal spectral response acceleration for 0.2- and 1.0-second periods with probabilities of exceedance of 10 percent in 50 years and 2 percent in 50 years. All of the maps were prepared by combining the hazard derived from spatially smoothed historic seismicity with the hazard from fault-specific sources. The acceleration values contoured are the random horizontal component. The reference site condition is firm rock, defined as having an average shear-wave velocity of 760 m/s in the top 30 meters corresponding to the boundary between NEHRP (National Earthquake Hazards Reduction program) site classes B and C. This data set represents the results of calculations of hazard curves for a grid of points with a spacing of 0.05 degrees in latitude and longitude. The grid of points were contoured to produce the final representation of the seismic-hazard. These maps are intended to summarize the available quantitative information about seismic ground motion hazard for the conterminous United States from geologic and geophysical source.

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Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Seismic-Hazard Maps for the Conterminous United States, 2008
Series title:
Scientific Investigations Map
Series number:
3195
Year Published:
2011
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Contributing office(s):
National Earthquake Hazards Reduction Program
Description:
Sheets 1-6: 31 inches x 24 inches, Map PDF, GIS data zip; Metadata; Geologic map database
Country:
United States
Projection:
Albers eaul-area conic
Scale:
7000000
Additional Online Files(Y/N):
Y