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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 <br /> two applications are not identical. <br /> Input <br /> Edition Spectral Period <br /> Conterminous U.S. 2014 (v4.0.x) Peak Ground Acceleration <br /> Latitude Time Horizon <br /> Decimal degrees Return period in years <br /> Longitude <br /> Decimal degrees, negative values for western longit... <br /> Site Class <br /> 760 m/s (B/C boundary) <br />