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Nine earthquakes, including a 4.0-magnitude quake, struck near San Ramon on Dec. 20, 2025, causing BART delays but no injuries or major damage.
A series of at least nine earthquakes, including a 4.0-magnitude tremor, shook the East Bay near San Ramon on December 20, 2025, with the strongest occurring at 7:56 p.m.
The swarm, centered southeast of the city, included multiple quakes ranging from 2.1 to 4.0 in magnitude, all shallow and felt across the region.
No injuries or significant damage were reported, though BART experienced delays due to safety inspections.
The U.S. Geological Survey confirmed the activity is part of a prolonged seismic swarm, with over 150 quakes recorded near San Ramon in the past month.
Scientists say such swarms are common and not predictive of larger quakes, though they emphasize ongoing preparedness in the earthquake-prone Bay Area.
Nueve terremotos, incluido un terremoto de magnitud 4.0, ocurrieron cerca de San Ramón el 20 de diciembre de 2025, causando retrasos en el BART, pero no hubo heridos ni daños importantes.