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Primary source of quake detection, review, and public risk communication
San Ramon's earthquake swarm won't quit—even for Christmas. A magnitude 3.1 rattled the Tri-Valley on Christmas Eve morning, the latest in a relentless cluster. Since early November, the swarm has delivered more than 300 earthquakes. The biggest jolts came in a chaotic 24-hour stretch: a 4.0 Friday evening, then a 3.9 Saturday night, each followed by smaller aftershocks.
Updated May 15
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