M1.8 earthquake 7km NNE of Anza, CA

A magnitude 1.8 earthquake struck 7km NNE of Anza, CA on Mon, Apr 7, 1986, 7:40 AM PST (15:40 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M3.7 6km SE of Thousand Palms, 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: 180 in the 60 days after this one and 180 in the 30 days before it.

The first 60 of 180.

From the USGS Earthquake Hazards Program and its partner networks, event ci121237. Read Wed, Sep 30, 2026, 8:05 AM UTC.