It happened at 9:23 a.m., less than an hour before the Great California Shake Out earthquake drill.
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Specifically, the epicenter was on the UC Berkeley Campus, 800 feet north east of the Cal Memorial Stadium.
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This quake hit less than a month after a 4.3 earthquake centered in Berkeley shook the Bay Area on September 22.
While the most people felt it in the East Bay, over 1,400 people reported feeling the quake from as far away as Santa Rosa, Petaluma, Lodi and Sunnyvale.
Stay with ABC7 News for updates on this developing story.
MAP: Significant San Francisco Bay Area fault lines and strong earthquakes
Zoom in on the map below and compare where you live to the significant faults and where strong earthquakes have struck in the Bay Area.
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Stay with ABC7 News for the latest details on this developing story.
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1400+ people reported feeling the quake to USGS (As of 10am PT)
Reported to be felt as far away as Santa Rosa, Petaluma, Lodi, and Sunnyvale
Reported be felt in 62 zip codes
Most responses came from East Bay: Berkeley, Oakland, Emeryville
Most shaking was reported as light to weak
Epicenter was on the UC Berkeley Campus, 800 feet north east of the Cal Memorial Football Stadium