October 2025 Seismic Activity Report: 149 Earthquakes
Complete analysis of Bay Area earthquake activity in October 2025. 149 total earthquakes recorded, 0 felt events. Trends, regional breakdown, and safety reminders.
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October 2025 Overview
The San Francisco Bay Area recorded 149 earthquakes in October 2025, with magnitudes ranging from M0.4 to M3.0.
Monthly Statistics
| Metric | Value |
|---|---|
| Total Earthquakes | 149 |
| Largest Earthquake | M3.0 |
| Average Magnitude | M1.66 |
| Felt Earthquakes (M3+) | 0 |
| Earthquake Swarms | 7 |
Magnitude Distribution
| Range | Count | Percentage |
|---|---|---|
| M0-2 (Micro) | 107 | 72% |
| M2-3 (Minor) | 42 | 28% |
| M3-4 (Light) | 0 | 0% |
| M4+ (Moderate+) | 0 | 0% |
Regional Breakdown
| Region | Earthquakes | Share |
|---|---|---|
| SF Peninsula | 53 | 36% |
| Santa Clara | 33 | 22% |
| Berkeley | 31 | 21% |
| Gilroy | 19 | 13% |
| Sonoma | 7 | 5% |
Weekly Trend
- Week of Oct 1: 25 earthquakes
- Week of Oct 8: 20 earthquakes
- Week of Oct 15: 34 earthquakes
- Week of Oct 22: 49 earthquakes
- Week of Oct 29: 7 earthquakes
No Felt Earthquakes
No earthquakes large enough to be widely felt (M3+) occurred this month.
Swarm Activity
7 earthquake swarms were detected in October 2025:
- SF Peninsula Swarm
- Duration: Oct 23, 2025 - Oct 24, 2025
- Total earthquakes: 12
- Peak magnitude: M2.6
- Berkeley Swarm
- Duration: Oct 23, 2025 - Oct 26, 2025
- Total earthquakes: 8
- Peak magnitude: M2.9
- Berkeley Swarm
- Duration: Oct 21, 2025 - Oct 23, 2025
- Total earthquakes: 5
- Peak magnitude: M2.2
- Santa Clara Swarm
- Duration: Oct 18, 2025 - Oct 18, 2025
- Total earthquakes: 6
- Peak magnitude: M2.8
- Berkeley Swarm
- Duration: Oct 16, 2025 - Oct 16, 2025
- Total earthquakes: 6
- Peak magnitude: M3.0
Looking Ahead
The Bay Area sits atop several major fault systems including the San Andreas, Hayward, and Calaveras faults. Scientists estimate a 72% probability of a magnitude 6.7 or greater earthquake in the region within the next 30 years.
Stay Prepared
1. Before: Create an earthquake kit and family communication plan
2. During: Drop, Cover, and Hold On
3. After: Check for injuries, assess damage, and be prepared for aftershocks
Report felt earthquakesTopics covered
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