M1.9 earthquake 23 km NNW of Dillon, Montana
A magnitude 1.9 earthquake struck 23 km NNW of Dillon, Montana on Fri, Apr 27, 2018, 10:48 AM MDT (16:48 UTC), 6 km (4 mi) below the surface.
A larger quake followed: M2.4 22 km NE of Lima, Montana. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.9 (ML, local (Richter)), micro
- Magnitude from
- Montana Bureau of Mines and Geology
- Local time
- UTC
- 2018-04-27 16:48:34 UTC
- Depth
- 5.9 km (3.7 mi), shallow
- Epicenter
- 45.425° N, 112.696° W
- Region
- Montana
- 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.
- Location uncertainty
- About 0.3 km horizontally, 1.0 km in depth
- Magnitude uncertainty
- ±0.25
- Depth from
- From location
- Station coverage gap
- 153°
- Stations used
- 16
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 7 in the 60 days after this one and 5 in the 30 days before it.
After
- 2.422 km NE of Lima, Montana · 3068 days ago · 1 km deep · 75 km away
- 2.233 km SSE of Salmon, Idaho · 3065 days ago · 4 km deep · 95 km away
- 1.79 km SSE of Harrison, Montana · 3060 days ago · 2 km deep · 77 km away
- 1.630 km NW of Leadore, Idaho · 3055 days ago · 7 km deep · 97 km away
- 1.525 km S of Ennis, Montana · 3053 days ago · 6 km deep · 86 km away
- 1.717 km SSE of Ennis, Montana · 3042 days ago · 6 km deep · 86 km away
- 2.316 km S of Whitehall, Montana · 3024 days ago · 2 km deep · 55 km away · felt by 1
Before
- 1.630 km NE of Lima, Montana · 3093 days ago · 12 km deep · 72 km away
- 1.530 km NE of Lima, Montana · 3095 days ago · 10 km deep · 72 km away
- 3.527 km NE of Lima, Montana · 3095 days ago · 10 km deep · 74 km away
- 1.819 km W of Lima, Montana · 3098 days ago · 13 km deep · 91 km away
- 2.14 km N of Willow Creek, Montana · 3107 days ago · 9 km deep · 96 km away · felt by 11
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event mb80291434. Read Fri, Oct 2, 2026, 9:45 PM UTC.