M2.5 earthquake 13 km NW of Challis, Idaho

A magnitude 2.5 earthquake struck 13 km NW of Challis, Idaho on Sat, Jul 20, 2019, 3:27 PM MDT (21:27 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.2 19 km NNE of Challis, Idaho. This one was a foreshock.

Map

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

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
2.5	ML, local (Richter)	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.069 · 28 stations
2.79	ML, local (Richter)	Montana Bureau of Mines and Geology	Final · ±0.227 · 20 stations

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: 22 in the 60 days after this one and 10 in the 30 days before it.

From the USGS Earthquake Hazards Program and its partner networks, event us70004pta (also filed as mb80353719). Read Mon, Oct 5, 2026, 2:40 AM UTC.