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About the Maps

Using the Map Data

The Seismic Hazard Zone Maps map may not show all areas that have the potential for liquefaction, landslide, strong earth ground shaking or other earthquake and geologic hazards. Also, a single earthquake capable of causing liquefaction or triggering landslide failure will not uniformly affect the entire area zoned.

U.S. Geological Survey base map standards provide that 90 percent of cultural features be located within 40 feet (horizontal accuracy) at the scale of this map (1:24,000). The identification and location of liquefaction and earthquake-induced landslide zones are based on available data. However, the quality of the data is varied. The zone boundaries depicted have been drawn as accurately as possible at this scale.

Information on this map is not sufficient to serve as a substitute for the geologic and geotechnical site investigations required under Chapters 7.5 and 7.8 of Division 2 of the Public Resources Code.

DISCLAIMER: The State of California and the Department of Conservation make no representations or warranties regarding the accuracy of the data from which these maps were derived. Neither the State nor the Department shall be liable under any circumstances for any direct, indirect, incidental, or consequential damages with respect to any claim by any user or any third party on account of or arising from the use of this map.

Purpose of the Map

These maps will assist cities and counties in fulfilling their responsibilities for protecting the public safety from the effects of earthquake-triggered ground failure as required by the Seismic Hazards Mapping Act

For information regarding the general approach and recommended methods for preparing this map, See DMG Special Publication 118, Recommended Criteria for Delineating Seismic Hazard Zone in California

For information regarding the scope and recommended methods to be used in conducting the required site investigations, see DMG Special Publication 117, Guidelines for Evaluating and Mitigating Seismic Hazards in California

For a general description of the Seismic Hazards Zonation Program, the Seismic Hazards Mapping Act and Regulations, and related information, please see the Fact Sheet.


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