California earthquakes

M2.3 earthquake 5km WNW of Cobb, CA

A magnitude 2.3 earthquake struck 5km WNW of Cobb, CA on Mon, Mar 1, 2021, 9:10 AM PST (17:10 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M4.0 21km SSW of Willits, CA. This one was a foreshock.

Cobb forecastMore in California

Map

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

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The earthquake

Magnitude
2.3 (Md, duration), micro
Magnitude from
Northern California Seismic System
Local time
UTC
2021-03-01 17:10:45 UTC
Depth
2.1 km (1.3 mi), shallow
Epicenter
38.836° N, 122.782° W
Felt reports
6
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

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

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 0.1 km horizontally, 0.1 km in depth
Magnitude uncertainty
±0.22
Depth from
From location
Station coverage gap
46°
Stations used
74

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 195 in the 60 days after this one and 87 in the 30 days before it.

After

The first 60 of 195.

Before

Earthquakes todayCalifornia earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event nc73529836. Read Sat, Oct 3, 2026, 6:18 PM UTC.