The USGS just published the 2008 probabilistic seismic hazard maps for the conterminous U.S. "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."
Ref: 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.
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