M3.4 earthquake 20 km N of Challis, Idaho
A magnitude 3.4 earthquake struck 20 km N of Challis, Idaho on Wed, Sep 9, 1987, 10:45 PM MDT (04:45 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
- 3.4 (ml), minor
- Local time
- UTC
- 1987-09-10 04:45:56 UTC
- Depth
- 5.0 km (3.1 mi), shallow
- Epicenter
- 44.686° N, 114.195° 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: 3 in the 60 days after this one and 2 in the 30 days before it.
After
- 2.923 km W of Challis, Idaho · 14255 days ago · 5 km deep · 33 km away
- 3.727 km SE of Challis, Idaho · 14225 days ago · 5 km deep · 44 km away
- 3.718 km NW of Challis, Idaho · 14219 days ago · 5 km deep · 18 km away
Before
Earthquakes todayIdaho earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp000389b. Read Tue, Sep 22, 2026, 12:14 PM UTC.