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.
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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.
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The earthquake depth was measured at just over 4 miles, the USGS said.
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