SAN RAMON, CALIFORNIA — A swarm of small earthquakes rattled the East Bay on Sunday morning, November 9, with the strongest registering M3.8 at 9:38 a.m. southeast of San Ramon, according to the U.S. Geological Survey.
Within minutes, several more quakes followed in the same area, including M3.7 at 9:39 a.m., M3.0 at 9:41 a.m., and M2.9 at 9:41 a.m.
USGS event data placed the mainshock roughly 4 km SE of San Ramon at a depth of about 9 km. Early reports indicated light to weak shaking across San Ramon, Dublin, Danville, and parts of Walnut Creek, with no immediate damage reported.
Mid-morning, additional tremors continued, including M3.2 and M3.0 around 10:42 a.m., part of a cluster that produced more than a dozen quakes by late morning, local outlets reported.
If you felt a jolt, you weren’t alone. USGS “Did You Feel It?” responses described brief rattling and a single sharp jolt, consistent with a shallow, moderate M3-class sequence on one of the East Bay’s many faults. As of early afternoon, there were no reports of injuries or significant damage, and the sequence appeared to be tapering into smaller aftershocks.
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