Welcome to the California Geological Survey
In April 1860 the California Legislature established the Geological Survey of California that has evolved during its 150 years of service, and several name changes, into today’s modern California Geological Survey (CGS). Of course, the earliest history of CGS has its founding roots entwined with the discovery of gold in 1848.
CGS is dedicated to the fulfillment of its mission to provide scientific products and services about the state's geology, seismology and mineral resources that affect the health, safety, and business interests of the people of California.
CGS geoscientists, engineers and support staff take great pride in upholding the heritage of an organization that has a 150 year legacy of providing the highest quality of scientific and engineering products and services to the State of California.
Altiora Petimus (1860)
News & Events
- November 5, 2013 - CGS has partnered with the USGS and the Southern California Earthquake Center in the Working Group for California Earthquake Probabilities to produce the Uniform California Earthquake Rupture Forecast version 3, a new evaluation of the seismic shaking potential in California. The following website provides access to the UCERF3 report and background materials. Click here to view the report.
- October 21, 2013 - CGS is pleased to release an update of Note 48, Checklist for the Review of Engineering Geology and Seismology Reports for California Public Schools, Hospitals, and Essential Services Buildings, dated October 2013. The guidelines have been revised to reflect the requirements of the 2013 California Building Code. The update can be found on the CGS web site. Click here to view the newly revised Note 48.
- September 4, 2013 - CGS has partnered with the USGS Science Application for Risk Reduction (SAFRR) project to evaluate the effects of a statewide tsunami scenario generated by a magnitude 9 earthquake off Alaska. CGS will be participating with other SAFRR partners in a number of statewide workshops over the next several weeks. The following website provides access to the SAFRR project report and the inundation maps.
Click here to view the report and maps.
- July 1, 2013 - CGS has added SMARA Land Classification Maps to the Information Warehouse.
Click to go directly to the Maps!
- CGS's Information Warehouse
CGS has developed a tool that allows you to search ALL of CGS's Regulatory, Landslide, Tsunami and SMARA maps using one interface.
Begin exploring for maps!
- Recent passing of former State Geologist Wesley G. Bruer, 1926-2013
- A New Way to Access CGS Natural Hazard Information
A collaborative web service called MyPlan has been established by the California Emergency Management Agency and the California Natural Resources Agency (CNRA) to provide a “one-stop shop” for local agency access to inter-active map information regarding natural hazards in California at http://myplan.calema.ca.gov/. CGS will continue to provide natural hazard information through its own website in addition to the new service.