Where did the earthquakes occur in the Bay Area?

The earthquakes occurred near San Ramon in the East Bay, which is part of the San Francisco Bay Area.

What was the largest magnitude earthquake reported?

The largest earthquake reported during the swarm measured a magnitude of 4.2.

What alert system was activated by the earthquakes?

California's tsunami alert system was activated due to the earthquake swarm.

Home / Disasters and Accidents / Bay Area Rocked by Quake Swarm, Tsunami Alert Triggered

Bay Area Rocked by Quake Swarm, Tsunami Alert Triggered

2 Feb

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Summary

Multiple earthquakes struck near San Ramon on Monday morning.
The largest earthquake registered a magnitude of 4.2.
California's tsunami alert system was activated during the swarm.

Bay Area Rocked by Quake Swarm, Tsunami Alert Triggered

A swarm of earthquakes rattled the San Francisco Bay Area on Monday morning, with multiple seismic events occurring in rapid succession near San Ramon. The earthquake swarm commenced around 9:27 AM ET, with the US Geological Survey reporting eight significant tremors in just 40 minutes. The largest of these earthquakes registered a magnitude of 4.2. This seismic activity triggered California's tsunami alert system, highlighting the potential impact of the quakes. San Ramon is located less than 40 miles from San Francisco and lies atop the Calaveras Fault, an active branch of the extensive San Andreas Fault system. The situation is ongoing as more details are expected.

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