M1.8 earthquake 3km ESE of Commerce, CA

A magnitude 1.8 earthquake struck 3km ESE of Commerce, CA on Tue, Jul 26, 1983, 5:12 AM PDT (12:12 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.7 0km E of Loma Linda, CA. 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: 71 in the 60 days after this one and 25 in the 30 days before it.

The first 60 of 71.

From the USGS Earthquake Hazards Program and its partner networks, event ci12328307. Read Sat, Oct 3, 2026, 2:22 PM UTC.