M4.0 earthquake 23 km SSE of Challis, Idaho

A magnitude 4.0 earthquake struck 23 km SSE of Challis, Idaho on Fri, Oct 28, 1983, 9:54 AM MDT (15:54 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M4.1 23 km E of Clayton, Idaho. 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: 68 in the 60 days after this one and 4 in the 30 days before it.

The first 60 of 68.

From the USGS Earthquake Hazards Program and its partner networks, event usp0001zc3. Read Tue, Sep 22, 2026, 8:57 PM UTC.