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U.S. Geological Survey - Earthquake Hazards Program <br /> Unified Hazard Tool <br /> Please do not use this tool to obtain ground motion parameter values for the design code <br /> reference documents covered by the U.S. Seismic Design Maps web tools (e.g., the <br /> International Building Code and the ASCE 7 or 41 Standard). The values returned by the two <br /> applications are not identical. <br /> ^ Input <br /> Edition Spectral Period <br /> Dynamic: Conterminous U.S. 2014 (v4.1, Peak ground acceleration <br /> Latitude Time Horizon <br /> Decimal degrees Return period in years <br /> 38.731 2475 <br /> Longitude <br /> Decimal degrees, negative values for western longitudes <br /> -105.164 <br /> Site Class <br /> 760 m/s (B/C boundary) <br />