Small Earthquake Swarm Shakes the Bay Area on Monday, USGS Says

Earthquake swarms keep rattling the Bay Area. What's going on?

The clusters of earthquakes have all been underneath the East Bay suburb of San Ramon, which is close to the Calaveras fault. There were at least 19 earthquakes of magnitude 2 or greater on Monday alone.

Small earthquake swarm shakes the Bay Area on Monday, USGS says

A handful of small earthquakes hit south of San Ramon on Monday morning, according to the U.S. Geological Survey.

Earthquake swarm continues shaking near East Bay’s San Ramon in California

In the early hours of Monday, December 8, 2025, the East Bay’s Tri-Valley region was shaken by a cluster of small earthquakes, continuing a month-long

New swarm of quakes — more than two dozen — strikes San Ramon

A sense of shakiness in the Tri-Valley only grew Monday morning when three earthquakes rattled the area in the course of about 100 minutes.

Earthquake swarm continues run of shaking near East Bay’s San Ramon

Dozens of minor quakes have been centered near the Tri-Valley city since November.

Multiple small earthquakes rumble near San Ramon

Multiple small earthquakes struck Monday morning, centered near San Ramon, according to the United States Geological Survey. The first temblor, a 2.9 magnitude, was reported at 2:33 a.m. and centered about 2.5 miles southeast of San Ramon, the USGS said. Two more quakes followed nearly 3 hours later and were centered in the same general area — a 3.0 magnitude at 5:21 a.m. then a 2.7 magnitude at 5:37 a.m., the USGS said. A 3.7 magnitude quake hi…