Residents near San Ramon experienced a series of earthquakes Monday morning, with more than a dozen recorded by the U.S. Geological Survey.
The most significant quake hit just after 7 a.m., registering at 4.2 in magnitude, following a 3.9 tremor that occurred at 6:30 a.m. This hour-long series of quakes was quite noticeable. Many people throughout the Bay Area felt the moderate shaking, as indicated by USGS’s reports.
Fortunately, there were no reports of injuries or damage to property. In fact, at least 19 earthquakes, including aftershocks, were confirmed on that day.
San Ramon, situated along the Calaveras Fault, has been experiencing a heightened level of seismic activity recently. Over 300 quakes have been reported in that area since December 1, 2025.
The Calaveras Fault is categorized as a creeping fault, which means it moves slowly but can produce small to moderate earthquakes quite frequently. Sometimes, this process can lead to a stronger quake, hitting around magnitude 4.0.
Just on Friday, two more quakes were detected, including one near Dublin.
As a precaution, BART trains in the San Francisco Bay Area were operating at reduced speeds while track inspections were conducted, leading to delays that affected the morning commute.
