M1.6 earthquake 18km ESE of Anza, CA

A magnitude 1.6 earthquake struck 18km ESE of Anza, CA on Mon, Oct 21, 1985, 1:10 AM PDT (08:10 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M1.6 11km ESE of North Shore, 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: 193 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 193.

From the USGS Earthquake Hazards Program and its partner networks, event ci126860. Read Tue, Sep 22, 2026, 8:57 PM UTC.