How many earthquakes hit the East Bay on Friday?

A series of six earthquakes struck the East Bay on Friday evening.

What was the strongest earthquake magnitude near San Ramon?

The strongest earthquake near San Ramon registered a magnitude of 4.0.

Were there any injuries or damage from the East Bay earthquakes?

No significant injuries or damage were reported following the series of earthquakes.

Home / Disasters and Accidents / Magnitude 4.0 Tremor Jolts East Bay

Magnitude 4.0 Tremor Jolts East Bay

20 Dec, 2025

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Summary

Six earthquakes struck the East Bay on Friday evening.
The strongest tremor registered a magnitude of 4.0.
No significant damage or injuries were reported.

The East Bay experienced a series of six earthquakes on Friday evening, with the seismic activity centered near San Ramon, according to the United States Geological Survey. The tremors began around 7:41 pm, with the strongest quake measuring a magnitude of 4.0.

Following the initial seismic events, five additional earthquakes struck the area, including two with a magnitude of 3.8, one of 3.1, and a 2.9. Residents in San Ramon, Dublin, Danville, and surrounding communities reported feeling the shaking, and the Bay Area Rapid Transit (BART) system experienced residual delays.