M1.7 earthquake 4km SE of Yucaipa, CA

A magnitude 1.7 earthquake struck 4km SE of Yucaipa, CA on Sun, Sep 5, 2021, 6:59 PM PDT (01:59 UTC), 17 km (11 mi) below the surface.

A larger quake followed: M3.4 10km NNW of Anza, CA. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

1 person reported to the USGS what they felt; the strongest reported shaking was III, weak shaking.

Reviewed by a seismologist.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 112 in the 60 days after this one and 50 in the 30 days before it.

The first 60 of 112.

From the USGS Earthquake Hazards Program and its partner networks, event ci40034120. Read Sun, Oct 4, 2026, 1:50 PM UTC.