If you were watching the Giants game at AT&T Park, you saw the camera shake.
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In Hayward, Sophia Barahona-Lopez and her son Joseph were watching the Warriors game on TV.
"The house just shook, it went back and forth and I have a cockatiel named Lucky and he was flying around in his cage warning us before," said Barahona-Lopez.
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"I was thinking to just duck and cover," added 14-year-old Joseph.
But, he said there wasn't enough time. The quake only lasted for a few seconds.
Bay Area commuters may not have felt the jolt-- but they felt the impact.
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BART put trains on hold temporarily for track inspection.
Muni went to manual mode for the same reason.
A notification from Alameda County reported no known damage or injuries.
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Did you guys feel that earthquake? We're hearing reports from Oakland, Emeryvlle, SF and Danville. We even felt it in our newsroom. USGS says it was a preliminary magnitude 3.8 centered two miles East of Oakland. https://t.co/eEKrKpQuYI— ABC7 News (@abc7newsbayarea) May 15, 2018