Idaho earthquakes

M3.7 earthquake 5 km ESE of Challis, Idaho

A magnitude 3.7 earthquake struck 5 km ESE of Challis, Idaho on Sun, Jan 4, 2015, 6:21 AM MST (13:21 UTC), 6 km (4 mi) below the surface.

A larger quake followed: M3.8 11 km ESE of Challis, Idaho. This one was a foreshock.

Challis forecast More in Idaho

Map

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

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The earthquake

Magnitude: 3.7 (mwr), minor
Local time: Sun, Jan 4, 2015, 6:21 AM MST
UTC: 2015-01-04 13:21:55 UTC
Depth: 6.1 km (3.8 mi), shallow
Epicenter: 44.478° N, 114.174° W
Region: Idaho
Felt reports: 13
Strongest shaking: IV, light shaking
Tsunami flag: No
Status: Reviewed by a seismologist

Shaking

The USGS ShakeMap: shaking estimated from seismic stations and the quake’s size, on the Modified Mercalli intensity scale.

Strongest estimated: IV, light shaking
Map: Automatic

USGS ShakeMap: estimated shaking intensity around the epicenter — Estimated shaking intensity. Map: USGS ShakeMap.

Did you feel it?

13 people reported to the USGS what they felt; the strongest reported shaking was IV, light shaking.

Fault motion and ground failure

How the rock slipped, from the moment tensor, and the USGS estimate of landslides and liquefaction.

Faulting: Normal
Moment magnitude: 3.7 Mwr
Nodal plane 1: Strike 126°, dip 54°, rake -117°
Nodal plane 2: Strike 346°, dip 44°, rake -58°

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 3.5 km horizontally, 4.2 km in depth
Magnitude uncertainty: ±0.04
Depth from: FROM_LOCATION
Station coverage gap: 67°
Stations used: 23

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 64 in the 60 days after this one and 57 in the 30 days before it.

After

The first 60 of 64.

Before

Earthquakes today Idaho earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event usc000tblx (also filed as mbmb15624236, mb15624236). Read Tue, Sep 22, 2026, 8:27 PM UTC.