M1.8 earthquake 18 km NNE of Mesa, California

A magnitude 1.8 earthquake struck 18 km NNE of Mesa, California on Thu, Nov 20, 1986, 4:14 AM PST (12:14 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M2.1 7 km NNE of Mesa, California. 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: 200 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 200.

From the USGS Earthquake Hazards Program and its partner networks, event nc1145392. Read Tue, Sep 22, 2026, 10:27 PM UTC.