U.S. Geological Survey Earthquake Hazard Map for the United States showing earthquake
ground accelerations (horizontal) having a 10 percent probability of
being exceeded in 50 years for a firm rock site condition. This map is
based on seismicity and fault-slip rates and takes into account the frequency
of occurrence of earthquakes of various magnitudes. Locally, hazard may
be greater than that shown, because site geology may amplify ground motions.
Maps for other parameters and probabilities of exceedance may be found
on the Internet at http://eqhazmaps.usgs.gov/.
|Posted July 2005
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