With nearly 30,000 recorded earthquakes every year, it’s always earthquake season in California. But during the next big one Santa Rosa, which sits atop several faults, could be especially hard hit.

During the granddaddy of Bay Area temblors, the 1906 earthquake centered in San Francisco, nearly 300 miles of the fault ruptured. Since then, we've learned a lot about why earthquakes strike. 

geol-petalumaSteve Walter, a member of the U.S. Geological Survey Earthquake Hazards Team, says odds are better than even that the Bay Area will experience a large earthquake in the next 30 years. 

Images: 1) County Courthouse, Santa Rosa, California, after the earthquake April 18, 1906. Courtesy of the California Historical Society; 2) Geological map. Courtesy of the U.S. Geologic Survey

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