M3.1 earthquake 4km NW of Cobb, CA

A magnitude 3.1 earthquake struck 4km NW of Cobb, CA on Thu, Nov 11, 2021, 7:05 AM PST (15:05 UTC), 2 km (1 mi) below the surface.

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
3.13	ML, local (Richter)	Northern California Seismic System	Preferred · Final · ±0.168 · 82 stations
2.9	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed · ±0.035 · 109 stations

25 people reported to the USGS what they felt; the strongest reported shaking was IV, light 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: 155 in the 60 days after this one and 107 in the 30 days before it.

The first 60 of 155.

From the USGS Earthquake Hazards Program and its partner networks, event nc73651550 (also filed as us7000ft8p). Read Sun, Oct 4, 2026, 2:45 PM UTC.