The quakes were centered four miles southwest of Alamo, five miles west of Danville, and five miles east southeast of Moraga, according to U.S.G.S.
A fourth quake registered 2.0 at 9:42 a.m., said Greg Gilbert, emergency services manager for the Town of Danville.
"There was no damage in the town, just some people awakened from their sleep," Gilbert said.
Large pieces of furniture should be secured with seismic straps, which can be purchased from Safe-T-Proof at www.safetyproof.com.
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