San Ramon, CA – A small earthquake swarm rattled parts of the East Bay on Friday morning, with at least three earthquakes striking within a short time span near San Ramon, according to seismologists.
According to the U.S. Geological Survey and the California Integrated Seismic Network (CISN), the largest quake in the sequence measured magnitude 3.0 and struck about 4 kilometers east-southeast of San Ramon at 8:14 a.m. local time. The quake occurred at a depth of approximately 8.2 kilometers, shallow enough for light shaking to be felt in nearby communities.
Two additional earthquakes followed within minutes. A magnitude 2.8 quake was recorded at 8:16 a.m., followed by a magnitude 2.6 event at 8:18 a.m., all occurring within roughly the same location east of San Ramon. Depths ranged from 7.7 to 8.8 kilometers, consistent with typical East Bay seismic activity.
Residents across San Ramon, Danville, Dublin, Pleasanton, and parts of Walnut Creek reported brief shaking, with some describing a quick jolt or rolling sensation. The USGS “Did You Feel It?” reports rated shaking intensity at level III to IV, meaning the movement was noticeable indoors but unlikely to cause damage.
Seismologists describe this pattern as an earthquake swarm, a cluster of small earthquakes occurring close together without a single dominant mainshock. While swarms can be unsettling, experts say they are common in California and do not necessarily signal a larger earthquake.
No injuries or structural damage have been reported. Officials remind residents to review earthquake safety plans and secure heavy furniture, especially in seismically active regions like the East Bay.
Earthquake activity continues to be monitored.
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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