It was initially reported as a magnitude-3.8, then a 3.6 before USGS downgraded the quake to a magnitude-3.5.
BART reported that trains stopped momentarily as a precaution as crews inspected tracks.
WATCH: Live ABC7 Quake Cam
Just two days ago, a series of earthquakes struck an area of San Diego County.
VIDEO: What to pack in your earthquake emergency kit