This quake was downgraded from a magnitude 4.6.
COBB, Calif. – A 4.5-magnitude earthquake shook the Cobb Mountain area early Thursday morning.
The quake occurred at 2:09 a.m., according to a preliminary report from the US Geological Survey.
The epicenter was located three miles west southwest of Cobb and 13 miles southwest of Clearlake at a depth of 1.2 miles, the survey reported.
By 3 a.m. the survey had received approximately 227 shake reports from 57 zip codes, including parts of Lake County and numerous Bay Area communities.
That large quake was followed three minutes later by a 2.9-magnitude aftershock centered three miles west of Cobb and 13 miles southwest of Clearlake, the survey reported.
Several area residents reported on Lake County News’ Facebook page that they felt the quake, with some of them having been awakened by it. Others stated it was the largest they’ve felt in the county.
Thursday morning’s quake is the largest in the county since a 4.5-magnitude quake was reported near The Geysers geothermal steamfield in May 2012, according to Lake County News records.
Email Elizabeth Larson at This email address is being protected from spambots. You need JavaScript enabled to view it. . Follow her on Twitter, @ERLarson, or Lake County News, @LakeCoNews.