Welcome to the California Department of Conservation

Search for Regulatory Maps

Navigate to your area of interest by entering in an address, selecting an affected city or county or using the navigation tools on the map. Then click on any of the quadrangles (boxes) to find out what maps/data is available. See legend below for descriptions.

Affected Counties
Affected Cities

( Search by address, county, city & state or zipcode )


Earthquake Fault Zones
Landslide and Liquefaction Zones
Fault zones, Landslide and Liquefaction Zones

Map results

There are no results, you need to first click inside any of the Quadrangles to see the results here.

Learn more about the maps.

Alquist-Priolo Earthquake Fault Zoning Act (1972) and the Seismic Hazards Mapping Act (1990) direct the State Geologist to delineate regulatory "Zones of Required Investigation" to reduce the threat to public health and safety and to minimize the loss of life and property posed by earthquake-triggered ground failures. Cities and counties affected by the zones must regulate certain development "projects" within them. These Acts also require sellers of real property (and their agents) within a mapped hazard zone to disclose at the time of sale that the property lies within such a zone.

Click on the following link for more information on the Alquist-Priolo Earthquake Fault Zoning Act.

Click on the following link for more information on the Seismic Hazards Mapping Act.

NOTE: Fault Evaluation Reports are available for those areas covered by a Regulatory Map however there are reports available for areas outside the Regulatory map boundary. For a complete set of maps available for purchase on CD please contact the CGS Library