​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Welcome to the California Geological Survey

California is the most geologically diverse, and — after Alaska — the most seismically active state in the United States of America. 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​​)

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CGS​ ​​​News​

​​​​Are You Ready to Shake?

Posted: 9/17/2018 11:00 AM

More than 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. Visit The Great California ShakeOut web site for more information.

CGS Deployed to Identify Post-Fire Debris Flow Hazards

Posted: 9/17/2018 10:00 AM
One of the many services provided by the California Geological Survey is post-wildfire assessment of the potential for debris flows. Working with CAL FIRE, CGS sent a crew of geologists to San Bernardino County to map potential debris flow hazards in the Holy Fire burn area. Learn more about debris flows and other landslides at our Types of Landslides page.
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