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

California Geological Survey

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​The California Geological Survey is one of the oldest geological surveys in the nation. Our mission is to provide scientific products and services about the state's geology, seismology, and minerals that affect the health, safety, and business interests of the people of California. –“Altiora Petimus” (We Reach Higher)



Looking Back at the 2019 Ridgecrest Earthquake SequenceLooking Back at the 2019 Ridgecrest Earthquake SequenceFive years ago, magnitude 6.4 and 7.1 earthquakes struck near Ridgecrest. This week the California Geological Survey published a new webpage highlighting actions taken by geologists, damage from the quake, how earthquakes are researched, and why this information helps keep Californians safe.,
New map: Strong Motion Instrumentation Program Network StationsNew map: Strong Motion Instrumentation Program Network StationsCalifornia has a network of more than 1,380 seismological stations that record and communicate strong shaking caused by earthquakes. This map shows the distribution of California's strong-motion stations, and highlights some of the buildings and other structures where these stations are installed., Download the PDF
Preliminary maps of proposed Seismic Hazard Zones and Earthquake Fault ZonesPreliminary maps of proposed Seismic Hazard Zones and Earthquake Fault ZonesToday the California Geological Survey released a new batch of maps and reports of proposed Seismic Hazard Zones and Alquist-Priolo Earthquake Fault Zones. Thus begins a 90-day public comment period for technical review comments that may have bearing on the proposed zones., Preliminary Release Announcements

 Upcoming Events



Calendar of geology-related events and anniversariesCalendar of geology-related events and anniversariesSubscribe to our Public Calendar of Events and never miss an important date: Anniversaries of major earthquakes and tsunamis · The Great Shakeout · SMIP Seminar...and more!2024-01-01T08:00:00Z2026-01-01T08:00:00Z, Link to Public Calendar of Events page

 Featured Content



Strong Motion Data and ReportsStrong Motion Data and ReportsLinks to the Center for Engineering Strong Motion Data, Internet Quick Reports and Internet Data Reports, ShakeMaps, and SMIP Seminar information.
MapsMapsLooking for California geologic maps? Start here.
Publication AnnouncementsPublication AnnouncementsRelease announcements of maps, reports and other publications of the California Geological Survey.
Publications of the California Geological SurveyPublications of the California Geological SurveyOfficial directory of publications we've produced from the late 19th century to the present.

California Geological Survey

 Contact Us

California Geological Survey
715 P Street, MS 1901
Sacramento, CA 95814