Risk Category Custom Probability Site Class A - Hard Rock B - Rock B - Estimated (see Section 11.4.3) C - Very Dense Soil and Soft Rock D - Stiff Soil D - Default (See Section 11.4.3) E - Soft Clay Soil F - Site Response Analysis

SEAOC and OSHPD developed this web interface that uses the USGS web services and retrieve the seismic design data and presents it in a report format. This website does not perform any calculations to the table values.

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Seismic Design Maps. Home (current) About; Report an Issue; Contact; Contact Web Contact: Manraj Singh SEAOC Contact: Ali Sumer. ... to substitute for the standard of care required of such professionals in interpreting and applying the results of the seismic data provided by this website. Users of the information from this website assume all ...