THE US GEOLOGICAL SURVEY HAS UPGRADED A 3.6-MAGNITUDE EARTHQUAKE TO 3.7. THE STORY HAS BEEN UPDATED TO REFLECT THAT.

THE GEYSERS – Two sizable earthquakes hit The Geysers area Monday evening.

The first, measuring 3.8 in magnitude, occurred at 5:29 p.m., while the second, occurring at 10:03 p.m., was 3.7 in magnitude, according to the US Geological Survey.

The 3.8-magnitude quake occurred at a depth of 1.5 miles, and was centered two miles north of The Geysers, five mile west of Cobb and seven miles west northwest of Anderson Springs, the US Geological Survey reported.

Residents of Clearlake and Kelseyville reported feeling it locally, while the US Geological Survey also received shake reports from Sonoma County and more than 130 miles away in Citrus Heights.

The earthquake measuring 3.7 on the Richter Scale was 1.9 miles deep, centered three miles north northeast of The Geysers, four miles west of Cobb and seven miles west of Anderson Springs. Shake reports came from as close as Kelseyville and as far away from San Francisco.

The first quake of the evening had a Mercalli Modified Intensity Scale rating of IV, which means some damage occurred and it was felt by many people, according to the strong ground motion sensors in Anderson Springs and Cobb.

The second quake had a Mercalli rating one step higher, at V, which means more people felt it and there was more potential for property damage.

On June 30 the county had a 3.8 quake, followed the next day by a 3.0, as Lake County News has reported. Both were in The Geysers area.

E-mail Elizabeth Larson at This email address is being protected from spambots. You need JavaScript enabled to view it. .