M1.7 earthquake 23km ESE of Anza, CA

A magnitude 1.7 earthquake struck 23km ESE of Anza, CA on Tue, Jul 9, 1985, 1:13 AM PDT (08:13 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.9 7km NNE of Big Bear City, 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: 188 in the 60 days after this one and 189 in the 30 days before it.

The first 60 of 188.

From the USGS Earthquake Hazards Program and its partner networks, event ci69952. Read Thu, Oct 1, 2026, 6:17 AM UTC.