M3.4 earthquake 13km W of Anza, CA

A magnitude 3.4 earthquake struck 13km W of Anza, CA on Tue, Mar 31, 1981, 6:05 PM PST (02:05 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M3.5 10km NW of Warner Springs, 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: 169 in the 60 days after this one and 92 in the 30 days before it.

The first 60 of 169.

From the USGS Earthquake Hazards Program and its partner networks, event ci513877 (also filed as usp0001cz6). Read Wed, Sep 30, 2026, 5:57 PM UTC.