M1.8 earthquake 2km NNW of Fontana, CA

A magnitude 1.8 earthquake struck 2km NNW of Fontana, CA on Tue, Feb 10, 1987, 9:02 AM PST (17:02 UTC), 4 km (2 mi) below the surface.

A larger quake followed: M2.1 10km SE of Big Bear City, 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: 172 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 172.

From the USGS Earthquake Hazards Program and its partner networks, event ci717021. Read Tue, Sep 22, 2026, 9:40 PM UTC.