M1.7 earthquake 6 km W of Cobb, California

A magnitude 1.7 earthquake struck 6 km W of Cobb, California on Sat, Dec 22, 1979, 11:25 PM PST (07:25 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M3.5 5 km ESE of Clearlake, California. 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: 123 in the 60 days after this one and 62 in the 30 days before it.

The first 60 of 123.

From the USGS Earthquake Hazards Program and its partner networks, event nc1049504. Read Mon, Oct 5, 2026, 2:43 PM UTC.