M2.3 earthquake 9km NE of Yucaipa, CA

A magnitude 2.3 earthquake struck 9km NE of Yucaipa, CA on Mon, Feb 2, 1987, 1:23 PM PST (21:23 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M2.9 11km N of Running Springs, 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: 173 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 173.

From the USGS Earthquake Hazards Program and its partner networks, event ci716601. Read Tue, Sep 22, 2026, 12:19 PM UTC.