Reported by USGS 96 days ago.
No stronger detection stands among the 19 recorded within 20 km of this point since 14 March 2026 — 18 others scored the same. The last comparable one was on 25 May 2026. One more was recorded here in the fortnight before it.
What the source measured
USGS reported: 18 km WSW of Petrolia, CA
USGS recorded magnitude 2.8 at a depth of 22 km.
Nearby, since 14 March 2026
- June 29, 2026 · score 0 · 3.2 km
- July 12, 2026 · score 0 · 4.0 km
- May 8, 2026 · score 0 · 4.4 km
How we know
One source: USGS. Not yet confirmed by a second, independent source.
Our own score for this event is 0 out of 100, at 59 % 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) | 0 / 100 |
| Our confidence | 59% |
| Coordinates | 40.2678, -124.4833 |
| Timestamp | 2026-05-27T09:23:57.150Z |
| Source | https://earthquake.usgs.gov/earthquakes/eventpage/nc75369752 |
Score Breakdown
Technical Details
| Mag | 2.75 |
| Depth | 21.62 |
| Tsunami | false |
| Sig | 116 |
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 0/100, 18 km WSW of Petrolia, CA (United States), based on data from usgs. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.