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Earthquake Swarm Centered Near San Ramon Shakes Bay Area
A swarm of 19 earthquakes, largest magnitude 4.2, rattled the Bay Area around San Ramon, causing transit delays but no major damage, USGS reported.
- On Monday morning the United States Geological Survey reported a swarm of 17 earthquakes near San Ramon between 6:27 a.m. and 7:42 a.m., with the strongest measuring magnitude 4.2 shortly after 7 a.m. about two-and-a-half miles southeast at nearly six miles depth.
- Since Dec. 1, 2025, data show roughly 300 quakes near San Ramon likely originated along the creeping Calaveras Fault, which causes swarm behavior by releasing stress in many small quakes.
- Shaking reached more than 30 miles away in San Francisco and East Bay cities, around 4,000 people reported feeling it to the USGS, and BART slowed trains causing delays up to 20 minutes.
- Seismology experts say smaller quakes don’t generally signal a Big One, and USGS reports less than a 6% chance of a larger quake next week, with about an 11% chance of a bigger quake by 2033.
- Scientists say there are no strict parameters for when swarms begin or end, so USGS continues monitoring after 91 quakes since Nov. 9 and a two-week gap suggested activity might be over.
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49 Articles
49 Articles
Swarm of earthquakes jolts California's San Ramon area—largest so far is 4.2
An ongoing string of more than a dozen earthquakes in less than 90 minutes early Monday ended what had been some recent calm from recent weeks of shaking ground in the region, according to the U.S. Geological Survey.
·United Kingdom
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Shortly before the game between the New England Patriots and the Seattle Seahawks, the Californian Bay Area did not talk about football, but about nature. A noticeable earthquake in the morning caused talk about San Francisco – especially at the beginning of the Super Bowl week. Why the Earth's impact has no impact on the mega event. With an unusual circumstances, the Super Bowl week began in the Bay Area: Early Monday morning, the region around…
·Vienna, Austria
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Coverage Details
Total News Sources49
Leaning Left8Leaning Right8Center20Last UpdatedBias Distribution56% Center
Bias Distribution
- 56% of the sources are Center
56% Center
L 22%
C 56%
R 22%
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