This quake has been upgraded from magnitude 4.0.
COBB, Calif. – The Cobb area had two moderate-sized earthquakes early Thursday, according to an update from the US Geological Survey.
A 4.5-magnitude earthquake occurred at 2:09 a.m. three miles west southwest of Cobb and 13 miles southwest of Clearlake at a depth of 1.2 miles, as Lake County News has reported.
The US Geological Survey said that, one minute later, a 4.0-magnitude quake that was centered three miles west of Cobb and 12 miles southwest of Clearlake – and measured at a depth of 2.2 miles – took place.
While some Lake County residents reported feeling two large quakes in quick succession, the US Geological Survey initially did not report the 4.0 quake until it released a preliminary report on it Thursday afternoon.
By 3 p.m. Thursday, there had been more than 100 aftershocks following those two larger quakes, according to US Geological Survey records.
Approximately 378 shake reports from 67 zip codes were submitted to the survey on the 4.5-magnitude quake. No shake reports appeared to have been submitted for the 4.0 quake; those reports may have been attributed to the initial quake.
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