M2.9 earthquake 23 km W of Challis, Idaho
A magnitude 2.9 earthquake struck 23 km W of Challis, Idaho on Sat, Sep 12, 1987, 5:36 AM MDT (11:36 UTC), 5 km (3 mi) below the surface.
A larger quake followed: M3.7 27 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.
The earthquake
- Magnitude
- 2.9 (ml), micro
- Local time
- UTC
- 1987-09-12 11:36:55 UTC
- Depth
- 5.0 km (3.1 mi), shallow
- Epicenter
- 44.499° N, 114.522° W
- Region
- Idaho
- Tsunami flag
- No
- Status
- Reviewed by a seismologist
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
Reviewed by a seismologist.
- Depth from
- OPERATOR_ASSIGNED
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 2 in the 60 days after this one and 3 in the 30 days before it.
After
- 3.727 km SE of Challis, Idaho · 14224 days ago · 5 km deep · 45 km away
- 3.718 km NW of Challis, Idaho · 14219 days ago · 5 km deep · 17 km away
Before
Earthquakes todayIdaho earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00038bb. Read Tue, Sep 22, 2026, 6:17 AM UTC.