The quake, reported at 11:02 p.m., occurred at a depth of less than one mile, according to the US Geological Survey.
It was centered two miles west southwest of Anderson Springs, five miles east southeast of The Geysers and five miles south of Cobb, the agency reported.
The US Geological Survey received shake reports from Middletown, Sunnyvale, Durham and San Jose.
Cobb resident Roger Kinney reported being able to hear the quake before it hit. He said it was a shaking and rolling type of temblor which didn't get as big as he expected.
The 3.3-magnitude quake was followed about a minute later by a 1.8-magnitude aftershock, centered in the same location, US Geological Survey records showed. At 11:04 p.m., a 1.4-magnitude temblor occurred two miles west southwest of Anderson Springs and five miles east southeast of The Geysers.
A 3.1-magnitude earthquake occurred near The Geyser geothermal steamfield on April 10, as Lake County News has reported.
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