M1.6 earthquake 9 km SSE of Harrison, Montana
A magnitude 1.6 earthquake struck 9 km SSE of Harrison, Montana on Sun, Mar 18, 2018, 3:01 AM MDT (09:01 UTC), 1 km (1 mi) below the surface.
A larger quake followed: M2.7 11 km NW of Harrison, Montana. This one was a foreshock.
Map
Where this earthquake was located, with the others nearby. Select one for its page.
The earthquake
- Magnitude
- 1.6 (ML, local (Richter)), micro
- Magnitude from
- Montana Bureau of Mines and Geology
- Local time
- UTC
- 2018-03-18 09:01:48 UTC
- Depth
- 1.0 km (0.6 mi), shallow
- Epicenter
- 45.615° N, 111.751° 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, 0.9 km in depth
- Magnitude uncertainty
- ±0.21
- Depth from
- From location
- Station coverage gap
- 62°
- 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 2 in the 30 days before it.
After
- 2.711 km NW of Harrison, Montana · 3115 days ago · 11 km deep · 20 km away · felt by 1
- 1.534 km SSE of Virginia City, Montana · 3112 days ago · 3 km deep · 64 km away
- 2.14 km N of Willow Creek, Montana · 3107 days ago · 9 km deep · 30 km away · felt by 11
- 1.917 km WNW of Hebgen Lake Estates, Montana · 3101 days ago · 12 km deep · 94 km away
- 1.530 km NE of Lima, Montana · 3094 days ago · 10 km deep · 97 km away
- 1.630 km NE of Lima, Montana · 3093 days ago · 12 km deep · 98 km away
- 1.923 km NNW of Dillon, Montana · 3080 days ago · 6 km deep · 77 km away
Before
Earthquakes todayMontana earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event mb80286419. Read Fri, Oct 2, 2026, 3:14 PM UTC.