Overview
- The United States Geological Survey recorded a preliminary magnitude 3.0 quake at 6:47 a.m. Monday centered about 6 to 7 miles from Brentwood and Blackhawk at a depth of roughly 10.5 miles.
- There were no immediate reports of damage or injuries following the tremor.
- USGS fault data place the epicenter roughly 1.9 miles northeast of the Marsh Creek‑Greenville fault zone, but the agency has not yet confirmed which fault produced the quake.
- The Monday quake struck nearly the same area as a magnitude 2.6 event on Sunday, and seismologists say the chance that these small shocks are foreshocks to a larger quake is very low.
- Local and federal agencies are continuing routine monitoring and directing residents to preparedness resources because small quakes occur frequently in California and can warrant watchful observation.