BERKELEY, Calif. - A 4.3 magnitude earthquake struck the East Bay overnight Monday, with moderate shaking felt across much of Alameda and Contra Costa counties.

The USGS reports the earthquake hit at 2:56 a.m. with an epicenter in Berkeley.

The earthquake was downgraded by the USGS from the original magnitude of 4.6

KTVU viewers reported feeling the earthquake in Oakland, San Pablo, Hayward, San Francisco, Benicia, Pleasant Hill and parts of the Peninsula.

Yevonne Jackmon said she felt it in San Leandro.

"The building I live in was shaking….Very scary," she told KTVU.

Richard Corvin of Oakland said he felt it but he wasn't worried.

"It was real fast," he said. "There were no subsequent jolts."

BART said trains will be running at reduced speeds while engineers complete safety in

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