Idaho earthquakes

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.

Challis forecastMore in Idaho

Map

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

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The earthquake

Magnitude
3.3 (ml), minor
Local time
UTC
2015-12-10 21:54:33 UTC
Depth
6.3 km (3.9 mi), shallow
Epicenter
44.563° N, 114.275° W
Region
Idaho
Felt reports
1
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

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

Did You Feel It? map: shaking reported by the public
Shaking reported by the public, by area. Map: USGS Did You Feel It?

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 2.9 km horizontally, 7.4 km in depth
Magnitude uncertainty
±0.26
Station coverage gap
82°
Stations used
20

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 70 in the 60 days after this one and 42 in the 30 days before it.

After

The first 60 of 70.

Before

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Sources

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.