M1.6 earthquake 20km ESE of Anza, CA

A magnitude 1.6 earthquake struck 20km ESE of Anza, CA on Mon, Apr 21, 2003, 6:49 AM PDT (13:49 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M3.9 16km ENE of Coachella, 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 at least 200 in the 30 days before it.

The first 60 of 193.

From the USGS Earthquake Hazards Program and its partner networks, event ci9909497. Read Mon, Oct 5, 2026, 2:39 AM UTC.