Inside California’s Recent Earthquake Swarm – And What It Means

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San Ramon Feels the Shaking Again

On December 8, 2025, residents of San Ramon, California woke up to their houses shaking. Then it happened again.

And again. By mid-morning, at least 16 small earthquakes had rattled the East Bay community, with the strongest clocking in at magnitude 3.7.

The rumbling was part of a swarm that started a month earlier and has now produced roughly 100 quakes in a one-mile radius…

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