San Ramon, CA – Residents across parts of the East Bay reported light shaking Tuesday morning after a small earthquake struck southeast of San Ramon, according to federal seismologists.
According to the U.S. Geological Survey (USGS), the magnitude 3.1 earthquake occurred at approximately 5:53 a.m. local time Tuesday, December 16, centered about 5 kilometers (3 miles) southeast of San Ramon in Contra Costa County. The quake originated at a depth of roughly 8.4 kilometers, which can increase the likelihood of being felt near the epicenter.
The USGS Community Internet Intensity Map rated shaking at Intensity IV (Light) in some areas. At least 40+ residents submitted “Did You Feel It?” reports, describing brief jolts, rattling windows, and subtle vibrations. No injuries or damage have been reported.
The epicenter sits east of Interstate 680 and northeast of San Jose, within a region that experiences frequent minor seismic activity. Earthquakes of this size are common in Northern California and typically do not cause structural damage, though they can be noticeable indoors, especially during early morning hours.
Seismologists note that small earthquakes do not relieve stress in a way that prevents larger quakes, but they also do not necessarily signal that a stronger event is imminent.
Residents are encouraged to review earthquake safety plans, secure heavy furniture, and ensure emergency kits are up to date.
Anyone who felt the shaking is urged to submit a report to the USGS to help scientists better understand how earthquakes impact local communities.
This article was produced by a journalist and may include AI-assisted input. All content is reviewed for accuracy and fairness.
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