M1.7 earthquake 4km SSW of Devore, CA

A magnitude 1.7 earthquake struck 4km SSW of Devore, CA on Sat, Oct 21, 1978, 4:35 PM PDT (23:35 UTC), 17 km (10 mi) below the surface.

A larger quake followed: M2.3 10km SSW of Idyllwild, 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: 105 in the 60 days after this one and 0 in the 30 days before it.

The first 60 of 105.

From the USGS Earthquake Hazards Program and its partner networks, event ci3343105. Read Wed, Sep 23, 2026, 7:51 PM UTC.