M1.8 earthquake 2 km NNW of Mesa, California

A magnitude 1.8 earthquake struck 2 km NNW of Mesa, California on Wed, Aug 21, 1985, 10:58 PM PDT (05:58 UTC), 9 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: 152 in the 60 days after this one and 46 in the 30 days before it.

The first 60 of 152.

From the USGS Earthquake Hazards Program and its partner networks, event nc1130627. Read Tue, Sep 22, 2026, 9:58 AM UTC.