A magnitude 3.4 earthquake shook Contra Costa County in the early hours of Saturday morning. The U.S. Geological Survey reported the tremor occurred around 12:30 a.m., approximately 5.5 miles southwest of Brentwood and at a depth of about 11 miles.
Residents in several Bay Area communities, including Pleasanton and Pittsburg, reported feeling the effects of the earthquake. As of Saturday morning, no injuries or damages have been reported as a result of the seismic event.