M2.7 earthquake 37 km W of Three Rocks, California

A magnitude 2.7 earthquake struck 37 km W of Three Rocks, California on Thu, Sep 10, 1981, 9:09 PM PDT (04:09 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M2.7 Central 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: 146 in the 60 days after this one and 42 in the 30 days before it.

The first 60 of 146.

From the USGS Earthquake Hazards Program and its partner networks, event nc1067514. Read Tue, Sep 22, 2026, 8:24 PM UTC.