3.0
Earthquake Details: 21 km WSW of Petrolia, California
Sep 21, 2026, 18:54:41
A magnitude 3.0 earthquake occurred near 21 km WSW of Petrolia, California on Sep 21, 2026 at 18:54:41. The seismic event was recorded at a depth of 5.65 km. No tsunami warning was issued.
No Tsunami WarningStatus: ReviewedType: Earthquake
Regional Seismicity
Technical Details
Depth5.65 km
Significance135
Latitude40.2763
Longitude-124.5300
Event IDnc75439497
Magnitude3.0
Updated:Sep 21, 2026, 21:27:20 UTC
External Resources
View on USGS Official SiteLoading map...
Time & depth
- Local time
- Sep 21, 2026, 11:54:41 PDT
- UTC
- Sep 21, 2026, 18:54:41 UTC
5.65 km · Shallow-focus
Less than 70 km deep. Shaking is often stronger near the epicentre.
Nearby major cities
Nearby event sequence · 11
M2.510 km ENE of Milpitas, CaliforniaBeforeM2.722 km SSW of Manton, CaliforniaBeforeM2.521 km W of Petrolia, CaliforniaAfterM2.918 km WNW of Klamath Falls, OregonAfterM2.647 km WNW of Petrolia, CaliforniaAfterM2.540 km W of Petrolia, CaliforniaAfterM2.81 km WNW of Sun Valley, NevadaAfterM2.62 km NW of Hollister, CaliforniaAfterM3.96 km SSW of Philo, CaliforniaAfterM3.710 km W of Boonville, CaliforniaAfterM2.710 km W of Boonville, CaliforniaAfter
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Earthquake information is automatically aggregated from the official seismic agencies listed below. Preliminary measurements can change as agencies review an event; use local emergency authorities for safety decisions. Latest successful data update: Sep 21, 2026, 21:27 UTC.
Data sources:
- USGS — Credit: U.S. Geological Survey.
- EMSC — Credit: EMSC/CSEM. Event catalogue data are provided under CC BY 4.0. CC BY 4.0
- JMA — Source: Japan Meteorological Agency (JMA).
- Geoscience Australia — Based on Australian Earthquakes data by Geoscience Australia. © Commonwealth of Australia. Licensed under CC BY 4.0; the section 5 disclaimer applies. CC BY 4.0
- GeoNet — We acknowledge the New Zealand GeoNet programme and its sponsors NHC, Earth Sciences NZ, LINZ, NEMA and MBIE for providing earthquake data.