The 3.1 quake occurred at 11:46 p.m. Thursday, according to US Geological Survey records.
It was centered three miles east of The Geysers, three miles south southwest of Cobb and four miles west northwest of Anderson Springs at a depth of 2.5 miles, the US Geological Survey reported.
It was followed by 14 smaller earthquakes, ranging between magnitude 1.0 and 2.0, over the next 24 hours, according to the report.
Shake reports came in on the quake from Clearlake, Middletown, Kelseyville, as well as Healdsburg and Geyserville. The US Geological Survey also reported receiving a report from as far away as Salinas.
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