M1.6 earthquake 3km WSW of Cobb, CA

A magnitude 1.6 earthquake struck 3km WSW of Cobb, CA on Wed, Aug 4, 2021, 12:23 PM PDT (19:23 UTC), 2 km (1 mi) below the surface.

A larger quake followed: M3.8 4km ENE of Talmage, CA. This one was a foreshock.

Map

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

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 165 in the 60 days after this one and 173 in the 30 days before it.

The first 60 of 165.

From the USGS Earthquake Hazards Program and its partner networks, event nc73605746. Read Sun, Oct 4, 2026, 1:57 PM UTC.