M1.8 earthquake 15 km NNE of Mesa, California

A magnitude 1.8 earthquake struck 15 km NNE of Mesa, California on Fri, Sep 18, 1987, 5:27 PM PDT (00:27 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.5 24 km E of Fish Camp, 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: 198 in the 60 days after this one and 113 in the 30 days before it.

The first 60 of 198.

From the USGS Earthquake Hazards Program and its partner networks, event nc106032. Read Wed, Sep 30, 2026, 5:10 AM UTC.