A magnitude 3.9 earthquake shook Alameda County on Monday afternoon, according to data provided by the U.S. Geological Survey.
Shaking could be felt as far as San Francisco and south of the city.
The earthquake was detected at 6:29 p.m. and was at an estimated depth of 6.6 miles.
"This was enough to make you sit up and think twice," KCBS Radio's Holly Quan, who felt the earthquake in Oakland, said.
There were no initial reports of injuries or damage.
"We felt it pretty strongly," said KCBS Radio's Matt Bigler, who was in San Leandro at the time of the earthquake. "I was washing dishes and all of a sudden the kitchen swaying rolling back and forth. It was kind of a rolling from one side of the house to the other."
BART tweeted that trains will run at reduced speeds during track inspection, per standard post-earthquake procedure. Service was delayed by as much as 20 minutes before resuming as normal at around 8:15 p.m.
The USGS' preliminary reading estimated the shaking at magnitude 4.2, later downgrading to magnitude 4.0 and then, finally, magnitude 3.9.
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