M2.7 earthquake 6 km NW of Challis, Idaho

A magnitude 2.7 earthquake struck 6 km NW of Challis, Idaho on Tue, Dec 8, 2015, 4:07 PM MST (23:07 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.3 7 km NNW of Challis, Idaho. 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 II, 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: 96 in the 60 days after this one and 17 in the 30 days before it.

The first 60 of 96.

From the USGS Earthquake Hazards Program and its partner networks, event us20004fpe (also filed as mb80112609). Read Thu, Sep 24, 2026, 12:03 AM UTC.