M3.3 earthquake 2 km ESE of Mesa, California

A magnitude 3.3 earthquake struck 2 km ESE of Mesa, California on Tue, Jul 9, 1985, 1:53 AM PDT (08:53 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M3.5 California-Nevada border region. 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: 189 in the 60 days after this one and 10 in the 30 days before it.

The first 60 of 189.

From the USGS Earthquake Hazards Program and its partner networks, event nc50810 (also filed as ci69956). Read Wed, Sep 23, 2026, 12:27 AM UTC.