Ground Motion Interpolator

​The CGS Ground Motion Interpolator is no longer available.

The data source for the GMI was the 2008 National Seismic Hazard Model (NSHM) for the Conterminous U.S. The NSHM has been updated at least twice since that time, and the CGS Ground Motion Interpolator does not reflect these changes. We have no plan to update the Ground Motion Interpolator.

Design professionals looking for seismic parameters to meet building code provisions should refer to the USGS Design Ground Motions web page.

Updated gridded hazard map data for the United States are available at the USGS National Seismic Hazard Data web page.

For more information on Earthquake Shaking Potential for California, please refer to the CGS Map Sheet 48 (PDF), or the CGS Map Sheet 48 Web Map.