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 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



Maps and DataMaps and DataLooking for California geologic maps or GIS data? Start here.
Official Map and Report Release AnnouncementsOfficial Map and Report Release AnnouncementsRecent releases of official maps, reports and other publications of the California Geological Survey.
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.
LandslidesLandslidesInformation about landslides and landslide mapping.
Earthquakes and FaultsEarthquakes and FaultsRecent and historic earthquakes, faults, earthquake probabilities, earthquake loss estimation, seismic hazard zonation, and more
TsunamisTsunamisGeneral tsunami information, tsunami preparedness, links to tsunami inundation maps, and more.





Anniversary of the 1994 Northridge EarthquakeAnniversary of the 1994 Northridge EarthquakeOn January 17, 1994, a magnitude 6​.7 earthquake centered in Northridge struck the southern California area. Known as the Northridge Earthquake, it caused at least 57 fatalities, injured thousands, and cost billions of dollars., Northridge Earthquake page
Updated Checklist for the Review of Engineering Geology and Seismology ReportsUpdated Checklist for the Review of Engineering Geology and Seismology ReportsDownload this update of CGS Note 48: "Checklist for the Review of Engineering Geology and Seismology Reports for California Public Schools, Hospitals, and Essential Services Buildings." CGS uses Note 48 to evaluate geologic reports that others prepare under CCR Title 24, California Building Code.
Get your 2020 CGS Calendar todayGet your 2020 CGS Calendar todayThe 2020 California Geological Survey calendar is available in two ver​sions. Download it today, or request a printed copy., CGS Calendar page
Help California Map Recent LandslidesHelp California Map Recent LandslidesThe California Recent Reported Landslides Database is a new online map showing the locations, photos, and other attributes of recent landslides in California. This map depends on volunteer reports from people like you! To learn more, visit our Official Releases page.,
30 Years After Loma Prieta, CGS Continues Quake Safety Work30 Years After Loma Prieta, CGS Continues Quake Safety WorkAs the 30th anniversary of the devastating Loma Prieta Earthquake approaches, it’s time to take stock of California’s preparedness. This week's Notes From the Field blog post explains how our California Geological Survey (CGS) has a large role to play in that area.,
California State Geologist Position VacancyCalifornia State Geologist Position VacancyThe State Mining and Geology Board and the Department of Conservation are accepting applications for the position of State Geologist. The California State Geologist serves as the head of the California Geological Survey (CGS), one of the largest state surveys in the nation., California State Geologist Position Vacancy

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