M1.7 earthquake 4km WNW of Anza, CA

A magnitude 1.7 earthquake struck 4km WNW of Anza, CA on Fri, Oct 1, 1982, 4:21 AM PDT (11:21 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M4.1 8km W of Morongo Valley, 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: 199 in the 60 days after this one and 143 in the 30 days before it.

The first 60 of 199.

From the USGS Earthquake Hazards Program and its partner networks, event ci508658. Read Tue, Sep 29, 2026, 4:23 PM UTC.