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A cluster of earthquakes shook parts of the East Bay on Monday morning, with the strongest reaching a preliminary magnitude of 4.3 near San Ramon, according to the U.S. Geological Survey.
The largest quake struck at about 7:01 a.m. and was centered roughly 2.7 miles east-southeast of San Ramon. It occurred at a depth of about 9 kilometers or around 5.5 miles, according to the USGS.
The first one detected on Monday was at 6:27 a.m., with a magnitude of 3.7 and with the same depth. A quake with a magnitude of 3.3 was recorded around 6:29 a.m., about 2.7 miles southeast of San Ramon, at a depth of 8 kilometers.
Three more quakes – measuring magnitude 3.1, 3.0, and 3.8 – struck at about 7:06 a.m., 7:23 a.m. and 7:27 a.m. respectively, also a few miles east-southeast of San Ramon. Nearly 30 earthquakes in all, including those less than 3.0-magnitude, were recorded on Monday morning – a swarm that followed 10 smaller quakes hitting the Tri-Valley from Jan. 25-31.
The temblors were felt in nearby cities, including Dublin, Danville and Pleasanton. There were no immediate reports of injuries or significant damage.
BART officials said trains are running at reduced speeds in the affected cities while crews complete safety inspections of tracks following the earthquakes. Passengers are advised to expect residual delays of up to 20 minutes systemwide.
