M3.3 earthquake 13 km ESE of Challis, Idaho
A magnitude 3.3 earthquake struck 13 km ESE of Challis, Idaho on Mon, Mar 23, 1987, 7:04 AM MST (14:04 UTC), 5 km (3 mi) below the surface.
A larger quake followed: M3.5 23 km SW of Clayton, Idaho. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 3.3 (ml), minor
- Local time
- UTC
- 1987-03-23 14:04:35 UTC
- Depth
- 5.0 km (3.1 mi), shallow
- Epicenter
- 44.439° N, 114.088° 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: 1 in the 60 days after this one and 0 in the 30 days before it.
After
Earthquakes todayIdaho earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp00033jx. Read Tue, Sep 22, 2026, 10:02 AM UTC.