COBB, Calif. – A 3.5-magnitude earthquake occurred in the Cobb area early Saturday morning.

The quake was reported at 12:37 a.m. Saturday, according to the US Geological Survey.

The survey said the quake was centered two miles west southwest of Cobb, three miles northeast of The Geysers geothermal steamfield and fives miles northwest of Anderson Springs, just inside the Lake County border.

The earthquake occurred at a depth of half a mile.

As of 3 a.m., the survey had received 15 shake reports, several of them coming from Kelseyville, Middletown and Lower Lake. Reports also came in from Calistoga, Saint Helena, Winters and Grass Valley.

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