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California Earthquake Shaking Potential (rev 2016)

State of California
  • Added 13 Sep 2018

The California Geological Survey published maps of “Earthquake Shaking Potential for California” in 1999 and has revised the maps following each update of the National Seismic Hazard Maps (NSHM). Similar to the NSHMs, the Earthquake Shaking Potential Maps for California depict expected intermediate period (1s or 1hz) ground motions with 2% exceedance probability in 50 years. Unlike the NSHMs, Earthquake Shaking Potential Map for California incorporates anticipated amplification of ground motions by local soil conditions. The current update of the Earthquake Shaking Potential Map for California (California Geological Survey Map Sheet 48) is based on the 2014 NSHMs developed by the United States Geological Survey (Petersen et al., 2014), a new map of the average shear wave velocity in the upper 30m of the earth’s surface for California (Wills et al., 2015), and a new semi-empirical nonlinear site amplification model (Seyhan and Stewart, 2014).

© D. Branum, R. Chen, C. Wills (California Geological Survey); M. Petersen (United States Geological Survey).

This layer is a component of Earthquake Shaking Potential for California (revised 2016).



Technical Details

Layer ID 97123
Data type Vector multipolygon
Feature count 88244
Attributes STLength, STArea, Vs30_Mean, Geologic_U, SA10_2
Services Vector Query API


Added13 Sep 2018
Revisions 1 - Browse all revisions
Current revision Imported on Sept. 13, 2018 from Esri JSON in WGS 84 / Pseudo-Mercator. 6055 geometries modified to be OGC compliant. Changelog.
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