SAN FRANCISCO, California (CNN) -- A magnitude 4.0 earthquake struck east of Oakland, California, at around 9 p.m. ET Friday, according to the U.S. Geological Survey.
The quake's epicenter was about 10 miles (16 kilometers) below the surface, the USGS reported.
Residents said they felt a sharp jolt, saw plants sway and dishes rattle.
There were no initial reports of damage or injuries.
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