M1.8 earthquake 20km ESE of Anza, CA

A magnitude 1.8 earthquake struck 20km ESE of Anza, CA on Mon, Feb 18, 1985, 5:23 AM PST (13:23 UTC), 16 km (10 mi) below the surface.

A larger quake followed: M3.6 18km NNE 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: 191 in the 60 days after this one and 190 in the 30 days before it.

The first 60 of 191.

From the USGS Earthquake Hazards Program and its partner networks, event ci61278. Read Sat, Oct 3, 2026, 6:57 PM UTC.