The quake occurred at 4:13 a.m., according to the US Geological Survey.
Survey records showed that the quake was centered two miles south southwest of Anderson Springs, five miles west of Middletown and six miles west of Cobb, at a depth of 1.2 miles.
The US Geological Survey received 13 shake reports from six zip codes – Hidden Valley Lake, Middletown, Healdsburg, Elk, Santa Rosa and San Francisco.
A 3.0-magnitude quake occurred three miles southwest of Anderson Springs on June 24, according to US Geological Survey records. That quake received 11 shake reports from around the North Coast and the Bay Area, but not from within Lake County.
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