M3.7 earthquake 18 km NW of Challis, Idaho
A magnitude 3.7 earthquake struck 18 km NW of Challis, Idaho on Sun, Oct 18, 1987, 12:36 AM MDT (06:36 UTC), 5 km (3 mi) below the surface.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.7 (ml), minor
- Local time
- UTC
- 1987-10-18 06:36:07 UTC
- Depth
- 5.0 km (3.1 mi), shallow
- Epicenter
- 44.622° N, 114.401° 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: 0 in the 60 days after this one and 1 in the 30 days before it.
Before
Earthquakes todayIdaho earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00039cd. Read Tue, Sep 22, 2026, 8:00 AM UTC.