M1.8 earthquake 16 km NNE of Dillon, Montana
A magnitude 1.8 earthquake struck 16 km NNE of Dillon, Montana on Sun, Aug 9, 2015, 1:29 AM MDT (07:29 UTC), 10 km (6 mi) below the surface.
Automatic solution: the magnitude and location may still be revised.
A larger quake followed: M3.4 32 km W of Hebgen Lake Estates, Montana. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.8 (Mc), micro
- Magnitude from
- Montana Bureau of Mines and Geology
- Local time
- UTC
- 2015-08-09 07:29:01 UTC
- Depth
- 9.8 km (6.1 mi), shallow
- Epicenter
- 45.364° N, 112.594° W
- Region
- Montana
- Tsunami flag
- No
- Status
- Automatic solution, may be revised
Did you feel it?
No one has reported feeling this quake to the USGS.
How well it is located
An automatic solution; a seismologist may revise it.
- Location uncertainty
- About 0.6 km horizontally, 0.4 km in depth
- Magnitude uncertainty
- ±0.50
- Station coverage gap
- 86°
- Stations used
- 18
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 10 in the 60 days after this one and 5 in the 30 days before it.
After
- 1.530 km WNW of Hebgen Lake Estates, Montana · 4056 days ago · 7 km deep · 100 km away
- 1.511 km NNE of Dillon, Montana · 4055 days ago · 10 km deep · 5 km away
- 3.432 km W of Hebgen Lake Estates, Montana · 4055 days ago · 11 km deep · 100 km away
- 1.520 km E of Lima, Montana · 4048 days ago · 0 km deep · 80 km away
- 2.97 km E of Lima, Montana · 4040 days ago · 6 km deep · 80 km away
- 2.37 km E of Lima, Montana · 4040 days ago · 7 km deep · 80 km away
- 1.78 km E of Lima, Montana · 4038 days ago · 8 km deep · 81 km away
- 2.119 km E of Lima, Montana · 4037 days ago · 5 km deep · 83 km away
- 1.540 km NNE of Spencer, Idaho · 4036 days ago · 12 km deep · 94 km away
- 1.632 km NNW of Lima, Montana · 4025 days ago · 11 km deep · 51 km away
Before
- 1.521 km NNW of Dillon, Montana · 4073 days ago · 11 km deep · 13 km away
- 1.539 km NNE of Spencer, Idaho · 4074 days ago · 8 km deep · 95 km away
- 1.913 km N of Dillon, Montana · 4074 days ago · 10 km deep · 4 km away
- 1.924 km ENE of Leadore, Idaho · 4095 days ago · 7 km deep · 78 km away
- 1.919 km NW of Lima, Montana · 4099 days ago · 1 km deep · 68 km away
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Sources
From the USGS Earthquake Hazards Program and its partner networks, event mb15141339. Read Thu, Oct 1, 2026, 6:11 AM UTC.