M1.8 earthquake Central California

A magnitude 1.8 earthquake struck in Central California on Fri, Jul 22, 1983, 12:20 AM PDT (07:20 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M5.5 11 km NE of Coalinga, 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: at least 201 in the 60 days after this one and at least 200 in the 30 days before it.

The first 60 of at least 201.

From the USGS Earthquake Hazards Program and its partner networks, event nc1099043 (also filed as ci11658). Read Thu, Oct 1, 2026, 1:36 AM UTC.