M1.5 earthquake 26 km SW of Firebaugh, California

A magnitude 1.5 earthquake struck 26 km SW of Firebaugh, California on Mon, Dec 21, 1987, 11:22 PM PST (07:22 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M4.5 28 km SW of South Dos Palos, 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: 167 in the 60 days after this one and 62 in the 30 days before it.

The first 60 of 167.

From the USGS Earthquake Hazards Program and its partner networks, event nc10086102. Read Thu, Oct 1, 2026, 11:13 AM UTC.