Three Minor Quakes Shake San Ramon in Ongoing Swarm

A series of minor earthquakes struck near San Ramon, California, on Friday morning, adding to an ongoing swarm that has unsettled the San Francisco Bay Area community since early November. The U.S. Geological Survey recorded three tremors in rapid succession: a magnitude 3.0 quake at 8:14 a.m., followed by a 2.8 at 8:16 a.m. and a 2.6 at 8:18 a.m. All were centered about 2.5 miles east-southeast of the city, at depths ranging from 4.75 to 5 miles underground.

Hundreds of residents across the Bay Area, including from as far as Menlo Park and Fremont, reported feeling light shaking that swayed dishes and rocked cars in the Tri-Valley region. No injuries or damage were immediately reported, consistent with the minor nature of the events. Quakes of this magnitude, between 2.5 and 3.0, are often felt but rarely cause significant harm, according to seismologists.

This latest activity is part of a broader earthquake swarm that has produced more than 300 tremors in the San Ramon area since November, with magnitudes ranging from below 1.0 up to 4.0 on December 19. The region, situated atop the Calaveras Fault—a branch of the San Andreas system—has experienced similar clusters at least...