The quake occurred at 2:10 a.m., according to the US Geological Survey.
It was a “poorly constrained” quake just under the earth's surface, based on survey reports. It was centered three miles west northwest of Anderson Springs, four miles east southeast of The Geysers and four miles south southwest of Cobb.
The US Geological Survey received nine shake reports from Lakeport, Middletown and Santa Rosa.
A 3.7-magnitude earthquake was reported near The Geysers on Dec. 6, as Lake County News has reported.
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