M1.8 earthquake 6 km NNE of Mesa, California

A magnitude 1.8 earthquake struck 6 km NNE of Mesa, California on Tue, Sep 11, 1984, 2:47 AM PDT (09:47 UTC), 12 km (7 mi) below the surface.

A larger quake followed: M2.5 32 km NW of Benton, 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: 197 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 197.

From the USGS Earthquake Hazards Program and its partner networks, event nc1120135. Read Tue, Sep 22, 2026, 8:45 PM UTC.