San Ramon Swarm Produces 4.2 Magnitude Quake Monday
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San Ramon, Calif. The U.S. Geological Survey reported a series of earthquakes struck the Tri-Valley area Monday morning, with a magnitude 4.2 temblor centered about 2½ miles southeast of downtown. The sequence began around 6:27 a.m., included multiple quakes between magnitudes 2.5 and 3.9, and culminated near 7:01 a.m.; agencies recorded between a dozen and dozens of tremors during a 30- to 90-minute span. BART slowed trains for track inspections; authorities reported no major damage or injuries. The USGS identified the event as part of an ongoing swarm that began in November. Based on 6 articles reviewed and supporting research.
Prepared by Emily Rhodes and reviewed by editorial team.
Timeline of Events
- Early November: USGS records an initial series of swarm earthquakes beginning Nov. 9.
- Mid-to-late December: Area recorded dozens of small events; analysts tracked ongoing swarm patterns.
- A two-week lull occurred before Friday when a 3.1 quake was recorded near San Ramon.
- Monday morning: tremors began ~6:27 a.m., culminating in a 4.2 magnitude quake around 7:01 a.m.
- Immediately after: BART slowed trains for inspections; authorities reported no major injuries and assessed minor property disturbances.
- Articles Published:
- 6
- Right Leaning:
- 0
- Left Leaning:
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- Neutral:
- 6
- Distribution:
- Left 0%, Center 100%, Right 0%
Public safety agencies and transit operators benefited from precautionary track inspections and operational data collection that reinforced safety protocols without reports of major damage.
Bay Area commuters and local businesses experienced delays and minor property disturbances from falling items during the morning earthquake swarm.
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San Ramon Swarm Produces 4.2 Magnitude Quake Monday
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