M3.1 earthquake 30 km NW of Mackay, Idaho
A magnitude 3.1 earthquake struck 30 km NW of Mackay, Idaho on Sun, Mar 31, 1985, 9:05 AM MST (16:05 UTC), 5 km (3 mi) below the surface.
A larger quake followed: M3.2 14 km ENE 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
- 3.1 (ml), minor
- Local time
- UTC
- 1985-03-31 16:05:34 UTC
- Depth
- 5.0 km (3.1 mi), shallow
- Epicenter
- 44.125° N, 113.851° 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: 9 in the 60 days after this one and 5 in the 30 days before it.
After
- 3.214 km ENE of Clayton, Idaho · 15141 days ago · 10 km deep · 36 km away
- 3.030 km WNW of Mackay, Idaho · 15136 days ago · 5 km deep · 19 km away
- 3.3Idaho-Montana border region · 15133 days ago · 10 km deep · 30 km away
- 3.34 km SW of Challis, Idaho · 15131 days ago · 10 km deep · 51 km away
- 3.15 km SW of Challis, Idaho · 15114 days ago · 5 km deep · 51 km away
- 3.023 km S of Clayton, Idaho · 15111 days ago · 5 km deep · 43 km away
- 3.113 km NE of Challis, Idaho · 15110 days ago · 5 km deep · 57 km away
- 3.225 km NW of Mackay, Idaho · 15107 days ago · 5 km deep · 9 km away
- 3.012 km NNW of Clayton, Idaho · 15107 days ago · 5 km deep · 56 km away
Before
- 3.126 km NW of Clayton, Idaho · 15157 days ago · 10 km deep · 71 km away
- 3.441 km ESE of Challis, Idaho · 15158 days ago · 5 km deep · 20 km away
- 3.539 km ESE of Challis, Idaho · 15158 days ago · 5 km deep · 27 km away
- 3.18 km SSE of Clayton, Idaho · 15159 days ago · 10 km deep · 42 km away
- 4.56 km NE of Challis, Idaho · 15165 days ago · 10 km deep · 54 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event usp0002dbg. Read Tue, Sep 22, 2026, 7:48 PM UTC.