The 4.2-magnitude earthquake was recorded at approximately 9:27 a.m. Sunday , according to the US Geological Survey , which originally had rated the quake as 4.4 in magnitude .
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4.2-magnitude earthquake record approximately 9:27 a.m. sunday accord geological survey originally rate quake 4.4 magnitude
The 4.2-magnitude earthquake was recorded at approximately 9:27 a.m. Sunday , according to the US Geological Survey , which originally had <m> rated </m> the quake as 4.4 in magnitude .
A powerful earthquake centered near The Geysers shook not just communities on Cobb but startled residents in other parts of the county and even in other states .
The 4.2-magnitude earthquake was recorded at approximately 9:27 a.m. Sunday , according to the US Geological Survey , which originally had <m> rated </m> the quake as 4.4 in magnitude .
The US Geological Survey report listed the epicenter as two miles east southeast of The Geysers , four miles southwest of Cobb and four miles west of Anderson Springs , at a depth of 2.7 miles .
At 9:32 p.m. , it was followed by a 2.0-magnitude centered quake two miles east of The Geysers and four miles southwest of Cobb , at a depth of two-tenths of a mile , according to the US Geological Survey .
Five more small quakes measuring between 1.0 and 1.9 on the Richter scale were reported in the following half-hour .
Altogether , 23 quakes occurred Sunday in and around The Geysers , Anderson Springs and Cobb , including the big quake and six smaller ones that happened before it , US Geological Survey records show .
Residents of Cobb , Kelseyville and Hidden Valley Lake told Lake County News that they felt the quake .
It was described as having a rolling-type movement .
No one reported damage although one person said she was nearly knocked out of her chair while sitting at the computer .
Cobb resident Roger Kinney initially reported that the quake lasted about 10 seconds , with it coming on quickly , followed by violent shaking before it dissipated and was followed by a second shockwave five seconds later .
He said it 's the largest quake he 's felt since moving to the area two and a half years ago .
The US Geological Survey received reports from people from around Lake County who felt the quake - including Middletown , Hidden Valley , Lakeport , Spring Valley , Clearlake and Cobb .
Numerous residents of Santa Rosa , Healdsburg , Napa and San Francisco also reported feeling it .
There were even reports from as far away as South Lake Tahoe , Vacaville and Las Vegas .
The last earthquake measuring 3.0 or above occurred on Dec. 30 , three miles east of The Geysers at a depth of 1.1 miles .
It measured 3.0 on the Richter scale , as Lake County News has reported .