M1.7 earthquake 9 km SSE of Harrison, Montana
A magnitude 1.7 earthquake struck 9 km SSE of Harrison, Montana on Thu, May 17, 2018, 11:15 AM MDT (17:15 UTC), 2 km (1 mi) below the surface.
A larger quake followed: M3.3 17 km SSW 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
- 1.7 (ML, local (Richter)), micro
- Magnitude from
- Montana Bureau of Mines and Geology
- Local time
- UTC
- 2018-05-17 17:15:05 UTC
- Depth
- 1.9 km (1.2 mi), shallow
- Epicenter
- 45.616° N, 111.747° 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 0.2 km horizontally, 0.7 km in depth
- Magnitude uncertainty
- ±0.34
- Depth from
- From location
- Station coverage gap
- 52°
- Stations used
- 19
Nearest places
Distance and direction from each place to the epicenter, with its forecast.
Nearby
Within 100 km, magnitude 1.5 and up: 6 in the 60 days after this one and 1 in the 30 days before it.
After
- 1.525 km S of Ennis, Montana · 3053 days ago · 6 km deep · 56 km away
- 1.717 km SSE of Ennis, Montana · 3042 days ago · 6 km deep · 47 km away
- 2.316 km S of Whitehall, Montana · 3024 days ago · 2 km deep · 32 km away · felt by 1
- 3.317 km SSW of Whitehall, Montana · 3014 days ago · 5 km deep · 36 km away · felt by 7
- 1.817 km S of Whitehall, Montana · 3014 days ago · 5 km deep · 31 km away
- 2.88 km NE of Alder, Montana · 3010 days ago · 9 km deep · 34 km away · felt by 1
Before
Earthquakes todayMontana earthquakesLive radar here
Sources
From the USGS Earthquake Hazards Program and its partner networks, event mb80293874. Read Sat, Oct 3, 2026, 1:51 AM UTC.