NORTHERN CALIFORNIA, Calif. – A 4.0-magnitude earthquake was reported early Sunday morning near The Geysers geothermal steamfield.

The quake, which occurred on the Sonoma County side of The Geysers, occurred at 3:12 a.m., according to the US Geological Survey.

The US Geological Survey said the epicenter was located two miles east southeast of The Geysers, four miles southwest of Cobb and five miles west of Anderson Springs, at a depth of nearly a mile and a half.

As of 3:45 a.m., nearly 40 shake reports had been filed with the US Geological Survey from around Lake, Napa and Sonoma counties, as well as the Bay Area, with more coming in.

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