Magnitude 4.5 Earthquake in SF Bay Area (1km SSE of Pleasant Hill) Monday Night
earthquake.usgs.gov
earthquake.usgs.gov
It was preceded by a foreshock of magnitude 2.5 by 9+ minutes.
Pleasant Hill is 23 miles (37km) NE of San Francisco, CA.
The earthquakes are not hypocentered in either the San Andreas fault or the Hayward fault.