The U.S. Geological Survey reported a magnitude 3.1 earthquake struck the San Francisco Bay area.
The USGS says the small quake hit at 3:44 a.m. Friday and was centered about a mile east-southeast of Emerald Lake Hills, California, 30 miles south of San Francisco and about the equal distance north of San Jose.
The quake had a depth of about 2.5 miles.
According to the USGS website, the quake was felt as far away as Concord, about 40 miles northeast of the center of the quake.
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