M1.9 earthquake 13 km N of Dillon, Montana
A magnitude 1.9 earthquake struck 13 km N of Dillon, Montana on Mon, Dec 17, 2018, 12:04 PM MST (19:04 UTC), 9 km (5 mi) below the surface.
A larger quake followed: M2.2 15 km S of Whitehall, 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
- 2018-12-17 19:04:52 UTC
- Depth
- 8.7 km (5.4 mi), shallow
- Epicenter
- 45.333° N, 112.614° 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 0.5 km horizontally, 0.6 km in depth
- Magnitude uncertainty
- ±0.11
- Depth from
- From location
- Station coverage gap
- 150°
- Stations used
- 10
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 11 in the 60 days after this one and 4 in the 30 days before it.
After
- 1.55 km ESE of Pony, Montana · 2843 days ago · 1 km deep · 69 km away
- 2.215 km S of Whitehall, Montana · 2840 days ago · 9 km deep · 58 km away
- 1.528 km SSE of Sula, Montana · 2825 days ago · 5 km deep · 99 km away
- 2.011 km S of Pony, Montana · 2808 days ago · 4 km deep · 63 km away
- 1.911 km S of Pony, Montana · 2806 days ago · 4 km deep · 63 km away
- 1.9Idaho-Montana border region · 2805 days ago · 11 km deep · 92 km away
- 1.617 km SSE of Leadore, Idaho · 2804 days ago · 0 km deep · 100 km away
- 1.79 km S of Pony, Montana · 2802 days ago · 2 km deep · 63 km away · felt by 1
- 2.210 km SSE of Dillon, Montana · 2794 days ago · 4 km deep · 22 km away
- 1.612 km SSE of Dillon, Montana · 2792 days ago · 3 km deep · 24 km away
- 2.2Western Montana · 2789 days ago · 1 km deep · 74 km away
Before
- 1.638 km WNW of Hebgen Lake Estates, Montana · 2849 days ago · 11 km deep · 91 km away
- 2.615 km N of Dillon, Montana · 2852 days ago · 8 km deep · 3 km away · felt by 4
- 1.626 km ENE of Leadore, Idaho · 2874 days ago · 4 km deep · 70 km away
- 2.034 km SE of Dillon, Montana · 2877 days ago · 7 km deep · 43 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event mb80328879. Read Sat, Oct 3, 2026, 6:38 PM UTC.