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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

(archived news and events)

Recent Releases

(expanded list of recent releases)

  • June 10, 2016 - Seven New and Revised Official Alquist-Priolo Earthquake Fault Zone Maps Released. Areas covered include parts of El Dorado and San Bernardino counties. Click here to view or download the Official Maps.
  • January 29, 2016 - CGS Special Report 241: Maritime Tsunami Response Playbooks: Background Information and Guidance for Response and Hazard Mitigation Use is now available for download (4.3MB).
  • January 29, 2016 - CGS Special Report 230: Geological Gems of California State Parks is available for download. This publication provides more than fifty short educational articles about the extraordinary geology of California's State Parks. Download (11MB).
  • January 29, 2016 - The 2016 CGS Calendar with photography by CGS geologist Jeremy Landaster is available for download in horizontal and vertical layouts.
  • December 10, 2015 - Seven proposed new and revised Preliminary Alquist-Priolo Earthquake Fault Zone maps released. See official map release June 10, 2016.