M2.3 earthquake 12km W of Anza, CA

A magnitude 2.3 earthquake struck 12km W of Anza, CA on Sat, Sep 5, 1987, 3:58 PM PDT (22:58 UTC), 3 km (2 mi) below the surface.

A larger quake followed: M3.5 4km NNE of Moreno 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: 179 in the 60 days after this one and 186 in the 30 days before it.

The first 60 of 179.

From the USGS Earthquake Hazards Program and its partner networks, event ci622613. Read Thu, Oct 1, 2026, 9:55 PM UTC.