The quake was recorded at 2.48 a.m. Thursday at nine-tenths of a mile, the US Geological Survey reported.
US Geological Survey records placed the quake's epicenter two miles west of Cobb, four miles northeast of The Geysers and six miles northwest of Anderson Springs.
No local residents reported feeling the quake, although the US Geological Survey received reports from Oakland, Shingle Springs and Vacaville.
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