Reported by ISC yesterday.
It is the strongest of the 9 detections recorded within 20 km of this point since 20 March 2026. Another comparable one was recorded here earlier the same day.
What the source measured
ISC reported: Off coast of northern California
Nearby, since 20 March 2026
- August 29, 2026 · score 15 · 0.0 km
- March 20, 2026 · score 0 · 0.6 km
- March 20, 2026 · score 0 · 0.6 km
How we know
Confirmed by 2 independent sources, including ISC.
Our own score for this event is 16 out of 100, at 62 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Earthquake |
| Severity | low |
| Calamity Score (ours) | 16 / 100 |
| Our confidence | 62% |
| Coordinates | 40.4250, -125.4030 |
| Timestamp | 2026-08-29T00:41:10.000Z |
| Source | http://www.isc.ac.uk/cgi-bin/web-db-run?event_id=646263157&out_format=IMS1.0&request=COMPREHENSIVE |
Score Breakdown
Technical Details
| Mag | 5 |
| Depth | 2 |
| MagType | Mw |
| Region | Off coast of northern California |
| Ncedc Mag | 4.8 |
| Ncedc Depth | 10 |
| Ncedc MagType | Mw |
| Ncedc Region | Petrolia, CA |
| MergedSources | [{"id":"ncedc_75426637","source":"ncedc","severity":"low","severityValue":28.799999999999997,"timestamp":1787964071610,"latitude":40.45,"longitude":-125.27233}] |
Safety Information
If you feel shaking: Drop, Cover, and Hold On. Move away from windows, heavy objects, and exterior walls. After shaking stops, check for injuries and structural damage. Be prepared for aftershocks, which can occur minutes to months after the mainshock. Follow instructions from local emergency management authorities.
Series begins 10 February 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Calamity.live data shows a earthquake event with CalamityScore 16/100, in Off Coast of Northern California (United States), based on data from isc. Source: Calamity.live, a platform aggregating real-time data from 191 scientific monitoring sources.