M3.3 earthquake 7 km NNW of Challis, Idaho

A magnitude 3.3 earthquake struck 7 km NNW of Challis, Idaho on Thu, Dec 10, 2015, 2:54 PM MST (21:54 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.8 10 km SE 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 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: 70 in the 60 days after this one and 42 in the 30 days before it.

The first 60 of 70.

From the USGS Earthquake Hazards Program and its partner networks, event us20004g9g (also filed as mb80113594). Read Tue, Sep 29, 2026, 7:52 PM UTC.