M1.7 earthquake 9 km W of Cobb, California

A magnitude 1.7 earthquake struck 9 km W of Cobb, California on Sat, Oct 10, 1981, 12:27 AM PDT (07:27 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M1.8 9 km ENE of Hidden Valley Lake, 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: 126 in the 60 days after this one and 60 in the 30 days before it.

The first 60 of 126.

From the USGS Earthquake Hazards Program and its partner networks, event nc1068489. Read Tue, Sep 22, 2026, 5:21 PM UTC.