COBB, Calif. – A 4.5-magnitude earthquake – followed by two aftershocks – occurred near The Geysers geothermal steamfield on Sunday afternoon.
The 4.5-quake was recorded at a depth of 1.6 miles at 12:24 p.m., according to the US Geological Survey.
The quake was centered three miles northwest of The Geysers and 13 miles southwest of Clearlake, based on the survey's records.
By 2 p.m. the survey had received approximately 167 shake reports from areas of Lake County including Clearlake, Hidden Valley Lake, Lakeport, Lower Lake, Nice and Middletown, as well as from residents in the neighboring counties of Sonoma and Napa, and as far away as San Jose.
Shortly after that initial quake, two large aftershocks occurred.
The first, a 2.6-magnitude quake, was recorded just two minutes after the initial quake at a depth of 1.7 miles, the US Geological Survey reported.
The survey said it was centered two miles west northwest of Cobb and 12 miles southwest of Clearlake. There was one shake report from Lakeport.
The second aftershock, measuring 2.5 in magnitude, was recorded at a depth of 1.6 miles at 12:36 p.m. The US Geological Survey reported it was centered four miles west of Cobb and 13 miles southwest of Clearlake.
That aftershock had one shake report from Kelseyville, the survey said.
The last earthquake measuring magnitude 4 or above in Lake County occurred last March 14, when a 4.5-magnitude temblor was reported three miles west southwest of Cobb, according to US Geological Survey 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.