Right now
The most recent data we hold from USGS arrived 43 minutes ago, and this point is not in it. We record detections, not passes: an absence is not proof that nothing is there.
Nothing else has been detected within 20 km in the last 24 hours.
Reported by USGS 94 days ago.
It is the 5th strongest of the 33 detections recorded within 20 km of this point since 20 March 2026. The last comparable one was on 3 June 2026. 6 more were recorded here in the fortnight before it.
What the source measured
USGS reported: 61 km W of Petrolia, CA
USGS recorded magnitude 4.5 at a depth of 10 km.
Nearby, since 20 March 2026
- June 3, 2026 · score 0 · 0.3 km
- June 3, 2026 · score 0 · 0.5 km
- June 3, 2026 · score 17 · 1.4 km
How we know
Confirmed by 2 independent sources, including USGS.
Our own score for this event is 5 out of 100, at 67 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Computed under scoring rules v1. Rows carrying other versions were judged by different rules and are not directly comparable.
Event Data
| Type | Earthquakes |
| Severity | Low |
| Calamity Score (ours) | 5 / 100 |
| Our confidence | 67% |
| Coordinates | 40.3580, -125.0033 |
| Timestamp | 2026-06-04T02:36:16.230Z |
| Source | https://earthquake.usgs.gov/earthquakes/eventpage/nc75370516 |
Score Breakdown
Technical Details
| Mag | 4.48 |
| Depth | 10 |
| Tsunami | false |
| Felt | 30 |
| Mmi | 2.86 |
| Alert | green |
| Sig | 320 |
| Emsc Mag | 4.5 |
| Emsc Depth | -10 |
| Emsc MagType | mw |
| Emsc Region | OFFSHORE NORTHERN CALIFORNIA |
| Emsc Auth | EMSC |
| Emsc SourceId | 2005130 |
| MergedSources | [{"id":"emsc_20260604_0000041","source":"emsc","severity":"low","severityValue":27,"timestamp":1780540577050,"latitude":40.3738,"longitude":-124.9037}] |
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 8 March 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.
Want to know when something happens in this area?
Calamity.live data shows a earthquake event with CalamityScore 5/100, 61 km W of Petrolia, CA (United States), based on data from usgs. Source: Calamity.live, a platform aggregating real-time data from 185 scientific monitoring sources.