Weekly RoundupM3.6 Peak39 earthquakes
Bay Area Earthquake Roundup: Dec 7 - Dec 13, 2025 (39 Earthquakes, Max M3.6)
39 earthquakes recorded in the Bay Area during the week of Dec 7 - Dec 13, 2025. Largest was M3.6. Complete summary and analysis.
Updated Dec 13, 2025, 11:59 PM PTPiedmont, San Ramon, Berkeley +2 more
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Piedmont
M3.6
39
Total Earthquakes
M3.6
Largest Magnitude
5
Cities Affected
Dec 13, 2025
Updated
Weekly Summary
The San Francisco Bay Area recorded 39 earthquakes during the week of Dec 7 - Dec 13, 2025.
Key Statistics
| Metric | Value |
|---|---|
| Total Earthquakes | 39 |
| Largest Magnitude | M3.6 |
| Average Magnitude | M2.09 |
| Most Active Region | San Ramon (35 earthquakes) |
Notable Earthquakes
- M3.6 - 4 km SE of San Ramon, CA
Monday, December 8, 2025 at 5:07 PM
View Details- M3.0 - 4 km SE of San Ramon, CA
Monday, December 8, 2025 at 1:21 PM
View Details- M2.9 - 4 km SE of San Ramon, CA
Monday, December 8, 2025 at 10:33 AM
View Details- M2.9 - 4 km ESE of San Ramon, CA
Monday, December 8, 2025 at 9:50 PM
View Details- M2.9 - 4 km ESE of San Ramon, CA
Monday, December 8, 2025 at 6:06 PM
View DetailsActivity by Region
- San Ramon: 35 earthquakes
- Berkeley: 2 earthquakes
- Gilroy: 1 earthquake
Swarm Activity
1 earthquake swarm was detected this week:
- San Ramon: 35 earthquakes (Peak: M3.6)
What This Means
This was a typical week for Bay Area seismic activity. The region experiences dozens of small earthquakes weekly, most of which go unnoticed by residents.
Stay Prepared
- Keep your earthquake emergency kit stocked and accessible
- Know what to do: Drop, Cover, and Hold On
- Report earthquakes you feel: Did You Feel It?
Topics covered
#weeklyroundup#bayarea#seismicactivity#piedmont#sanramon#berkeley#gilroy#cotati
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Data source:USGS Earthquake Hazards Program