M1.7 earthquake 22 km ESE of Challis, Idaho

A magnitude 1.7 earthquake struck 22 km ESE of Challis, Idaho on Mon, Oct 19, 2015, 1:45 PM MDT (19:45 UTC), 9 km (6 mi) below the surface.

A larger quake followed: M2.5 southern 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: 83 in the 60 days after this one and 15 in the 30 days before it.

The first 60 of 83.

From the USGS Earthquake Hazards Program and its partner networks, event mb80102759. Read Wed, Sep 23, 2026, 3:21 AM UTC.