Mt. Soledad landslide in La Jolla, CA - October 2007

California Geological Survey

California is the most geologically diverse and the second most seismically active state in the USA. The California Geological Survey (CGS) provides scientific products and services about the state's geology, seismology and mineral resources, including their related hazards, that affect the health, safety, and business interests of the people of California. We are one of the oldest geological surveys in the nation, and today produce more products and provide more services to more people than any other state survey. –“A​ltiora Petimus”​ ​(We Reach Higher​​)

 Featured Content



Geologic HazardsGeologic HazardsInformation about California's earthquakes, faults, landslides, tsunami hazards, liquefaction zones, and hazardous minerals.
CGS PublicationsCGS PublicationsMaps, reports, data, guidebooks and more are available for download and purchase.
Earthquake Data and ReportsEarthquake Data and ReportsLinks to the Center for Engineering Strong Motion Data, Internet Quick Reports and Internet Data Reports, ShakeMaps, and SMIP Seminar information.
Mineral Resources and Mineral HazardsMineral Resources and Mineral HazardsInformation about non-fuel mineral resources, naturally occurring mineral hazards, and active and historic mining activities throughout the state.




Anniversary of the 1933 Long Beach EarthquakeOn March 10, 1933, a large earthquake tore through the city of Long Beach, prompting the California State Legislature to pass the Field Act., /cgs/Pages/Earthquakes/LongBeach.aspx2019-03-09T08:05:00Z
CGS announces five new Preliminary Seismic Hazard Zone mapsSeismic Hazard Zones are areas that have potential for ground deformation caused by liquefaction or landslides. Areas affected by this release are in Contra Costa and San Mateo counties; click/tap for details. Public comments are due to the State Mining and Geology Board no later than Jan. 2, 2019., /cgs/preliminary-releases2018-10-04T15:00:00Z
Great California ShakeOut is ComingAre you ready to shake? About 6.6 million Californians already have registered for the Great California Shakeout earthquake drill. Practice how to drop, cover, and hold on in the event of a big quake at 10:18 a.m. on October 18., Statewide Earthquake Drill Set for October 182018-10-01T23:00:00Z
WSSPC Executive Director SearchThe Western States Seismic Policy Council is seeking a new Executive Director. Applications are due by October 15, 2018 for a January 2019 start date. Click/tap this announcement to view the job description at WSSPC's website., Western States Seismic Policy Council2018-09-19T20:00:00Z
CGS Scientists Map Burned AreaOne of the many services provided by the California Geological Survey is post-wildfire assessment of the potential for mudslides. Working with CAL FIRE, CGS sent a crew of geologists to Riverside County to map potential hazards following the recent Holy Fire. CGS post-fire landslide reponse.pdf, CGS post-fire landslide reponse.pdf2018-09-17T19:00:00Z
2018 update to Map Sheet 52 [Aggregate Sustainability in California]Aggregate materials are essential to modern society. Map Sheet 52 summarizes projected aggregate needs and currently permitted reserves., View/download the release statement (PDF document)2018-07-16T07:00:00Z