The quake occurred at a depth of a mile and a half at 2:39 a.m., according to the US Geological Survey.
It was centered one mile northwest of The Geysers, six miles west southwest of Cobb and eight miles west northwest of Anderson Springs, the US Geological Survey reported.
The agency received nine shake reports from eight zip codes, with reports coming form Kelseyville and Middletown, areas of Sonoma County such as Cloverdale, Petaluma and Sebastopol, and as far south as San Jose.
The last quake of magnitude 3.0 or above reported in Lake County occurred on March 10, as Lake County News has reported.
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