CONTRA COSTA COUNTY, CA - According to the U.S. Geological Survey, a preliminary 2.0 magnitude quake occurred near San Ramon ...

The largest of the 19 earthquakes measured by the U.S. Geological Survey was a magnitude 4.2 shaker that was centered about ...

Data from the USGS shows the seismic events have ranged in strength from 2.5 up to 4.2 in magnitude.

Did you feel them? A 4.2 earthquake struck near San Ramon Monday morning, following a 3.8 quake amid a string of over 30 ...

Earthquakes with preliminary magnitudes of 3.4 and 2.9 struck three miles southeast of San Ramon about 5:30 p.m. Friday ...