M1.5 earthquake 10km WSW of Anza, CA

A magnitude 1.5 earthquake struck 10km WSW of Anza, CA on Thu, Jul 30, 1981, 11:03 AM PDT (18:03 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M4.0 8km NE of Julian, 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: 185 in the 60 days after this one and 128 in the 30 days before it.

The first 60 of 185.

From the USGS Earthquake Hazards Program and its partner networks, event ci520291. Read Wed, Sep 30, 2026, 1:03 AM UTC.