M1.8 earthquake 3km SSW of Cobb, CA

A magnitude 1.8 earthquake struck 3km SSW of Cobb, CA on Sat, Jan 23, 2021, 9:46 PM PST (05:46 UTC), 2 km (1 mi) below the surface.

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

Map

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

1 person 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: 184 in the 60 days after this one and 66 in the 30 days before it.

The first 60 of 184.

From the USGS Earthquake Hazards Program and its partner networks, event nc73515635. Read Sun, Oct 4, 2026, 1:10 AM UTC.