M3.2 earthquake 12km WSW of Petrolia, CA

A magnitude 3.2 earthquake struck 12km WSW of Petrolia, CA on Mon, Jan 11, 2021, 7:25 PM PST (03:25 UTC), 21 km (13 mi) below the surface.

A larger quake followed: M4.4 80km W of Petrolia, CA. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
3.23	ML, local (Richter)	Northern California Seismic System	Preferred · Final · ±0.184 · 17 stations
3.1	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.035 · 105 stations

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

6 people reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 37 in the 60 days after this one and 20 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event nc73509880 (also filed as us6000d7mu). Read Sun, Oct 4, 2026, 9:50 PM UTC.