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



TsunamisTsunamisGeneral tsunami information, tsunami preparedness, links to tsunami inundation maps, and more.
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





CGS Shares Expertise During Nevada’s Largest Temblor in 65 YearsCGS Shares Expertise During Nevada’s Largest Temblor in 65 YearsThe largest earthquake in Nevada in 65 years drew the attention at the California Geological Survey – not because it caused significant damage – but because it helps paints a clearer picture of what’s going on under the Earth’s surface in our state.,
Senior Precision Electronics Specialist exam is onlineSenior Precision Electronics Specialist exam is onlineThe SENIOR PRECISION ELECTRONICS SPECIALIST examination is now open at Electronic specialists play a critical role in our seismic instrumentation program. Visit for eligibility requirements, instructions, and more. The exam cutoff date is Dec. 31, 2020., Link to exam posting at CalCareers
40th Anniversary of Mammoth Lakes Earthquakes40th Anniversary of Mammoth Lakes EarthquakesOn May 25, 1980–nearly one week after the spectacular eruption of the Mount St. Helens volcano–a magnitude 6.0 earthquake rocked through Mammoth Lakes, CA. Recap seismic activity that followed on this week's Notes from the Field blog post.,
CGS' Janis Hernandez Lends a Hand After Puerto Rico QuakeCGS' Janis Hernandez Lends a Hand After Puerto Rico QuakeIn the blog this week, Janis Hernandez, a senior engineering geologist who heads California Geological Survey’s LA office, shares her experience responding to the earthquake swarm that hit the island December 2019 - January 2020.,
Temporary Closure of the CGS Library and Publications Sales DeskTemporary Closure of the CGS Library and Publications Sales DeskIn an effort to protect public health and the safety of our visitors and staff as the state responds to the continued threat of COVID-19, the California Geological Survey Library and Publications Sales Desk have temporarily suspended operations.,
California Accepting Applications for State Geologist VacancyCalifornia Accepting Applications for State Geologist VacancyVacant since 2018, this position provides technical information and advice to the Governor, State agencies, and the public on issues pertaining to California geology, geologic hazards, engineering geology, and mineral resources. Click/tap this news item for more information., SMGB web page: State Geologist Position Opening
CGS Note 48 update-Checklist for Engineering Geology and Seismology ReportsCGS Note 48 update-Checklist for Engineering Geology and Seismology ReportsCGS uses Note 48 (Checklist for the Review of Engineering Geology and Seismology Reports for California Public Schools, Hospitals, and Essential Services Buildings) to evaluate geologic reports prepared under CCR Title 24, California Building Code. Click/tap this news item to download the update.
Help California Map Recent LandslidesHelp California Map Recent LandslidesThe California Recent Reported Landslides Database is an 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.,

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