Scientific Investigations Map 3195
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.
1U.S. Geological Survey
First posted December 27, 2011
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Petersen, M.D., Frankel, A.D., Harmsen, S.C., Mueller, C.S., Haller, K.M., Wheeler, R.L., Wesson, R.L., Zeng, Yuehua, Boyd, O.S., Perkins, D.M., Luco, Nicolas, Field, E.H., Wills, C.J., and Rukstales, K.S., 2011, Seismic-Hazard Maps for the Conterminous United States, 2008: U.S. Geological Survey Scientific Investigations Map 3195, 6 sheets, scale 1: 7,000,000.
SIM3195_sheet1.pdf--map of peak horizontal acceleration with 10% probability of exceedance in 50 years
SIM3195_sheet2.pdf--map of peak horizontal acceleration with 2% probability of exceedance in 50 years
SIM3195_sheet3.pdf--map of horizontal spectral response acceleration for 0.2-second period with 10% probability of exceedance in 50 years
SIM3195_sheet4.pdf--map of horizontal spectral response acceleration for 0.2-second period with 2% probability of exceedance in 50 years
SIM3195_sheet5.pdf--map of horizontal spectral response acceleration for 1.0-second period with 10% probability of exceedance in 50 years
SIM3195_sheet6.pdf--map of horizontal spectral response acceleration for 1.0-second period with 2% probability of exceedance in 50 years