The quake occurred at 7:37 a.m. with an epicenter located about 23 miles south of Bakersfield, according to the USGS. It originally registered a magnitude of 3.5.
There were no immediate reports of significant damage or injuries.
"I work here at the base of the grapevine and didn't feel anything," Eric Lopez wrote on Facebook.
The earthquake depth was measured at just over 4 miles, the USGS said.
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