M1.7 earthquake 21km ESE of Anza, CA

A magnitude 1.7 earthquake struck 21km ESE of Anza, CA on Mon, Apr 22, 1985, 4:03 AM PST (12:03 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M3.7 11km NNE of Aguanga, 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: 184 in the 60 days after this one and 174 in the 30 days before it.

The first 60 of 184.

From the USGS Earthquake Hazards Program and its partner networks, event ci64941. Read Thu, Oct 1, 2026, 6:16 AM UTC.