Breaking News — Monday, February 2, 2026 — San Francisco Bay Area, CA
The San Francisco Bay Area was shaken by a significant swarm of earthquakes early Monday, centered near San Ramon in Contra Costa County, officials report. According to the U.S. Geological Survey, at least 21 tremors struck the region throughout the morning, the strongest registering a magnitude of 4.2 just after 7:00 a.m. local time.
Residents across the East Bay felt the shaking, with reports of rattling windows, swaying lights, and shaking furniture in communities from San Ramon to Oakland, Richmond, Hayward, and portions of San Francisco. More than 4,000 felt reports poured in, indicating the tremors were widely felt, although no major injuries have been reported so far.
Local transit was briefly affected; Bay Area Rapid Transit (BART) slowed trains during morning operations as crews conducted precautionary safety inspections of tracks and systems.
Seismologists say this cluster of quakes fits the pattern of an earthquake swarm—a series of small to moderate quakes occurring over a short period without one single large mainshock followed by aftershocks. The San Ramon area sits near the active Calaveras Fault, and recent months have seen elevated seismic activity in this part of the East Bay, with dozens of small quakes recorded in recent weeks and months.
Experts emphasize that while swarms can be unsettling, they are not reliable predictors of a much larger earthquake. Still, officials are reminding Bay Area residents to review earthquake preparedness plans and ensure emergency kits and procedures are ready, especially in this seismically active region.
Authorities continue to monitor seismic activity and will update the public as more information becomes available.
“San Francisco Earthquake Super Crack” by Scott Beale is licensed under CC BY-NC-ND 2.0
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