Montana earthquakes

M1.5 earthquake 37 km SSW of Dillon, Montana

A magnitude 1.5 earthquake struck 37 km SSW of Dillon, Montana on Sat, Aug 28, 2021, 8:52 AM MDT (14:52 UTC), 7 km (4 mi) below the surface.

A larger quake followed: M2.4 25 km N of Spencer, Idaho. This one was a foreshock.

Dillon forecastMore in Montana

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.5 (ML, local (Richter)), micro
Magnitude from
Montana Bureau of Mines and Geology
Local time
UTC
2021-08-28 14:52:28 UTC
Depth
6.5 km (4.0 mi), shallow
Epicenter
44.929° N, 112.890° 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 0.6 km horizontally, 1.4 km in depth
Magnitude uncertainty
±0.25
Depth from
From location
Station coverage gap
135°
Stations used
9

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 12 in the 60 days after this one and 1 in the 30 days before it.

After

  1. 2.128 km SSE of Virginia City, Montana · 1861 days ago · 11 km deep · 82 km away
  2. 2.235 km NNE of Spencer, Idaho · 1857 days ago · 10 km deep · 79 km away
  3. 1.538 km SSW of Virginia City, Montana · 1856 days ago · 5 km deep · 61 km away
  4. 2.425 km N of Spencer, Idaho · 1855 days ago · 9 km deep · 71 km away
  5. 1.741 km SW of Dillon, Montana · 1844 days ago · 0 km deep · 15 km away · felt by 1
  6. 1.819 km E of Challis, Idaho · 1831 days ago · 6 km deep · 99 km away
  7. 1.729 km SSW of Dillon, Montana · 1823 days ago · 11 km deep · 8 km away
  8. 1.541 km SW of Dillon, Montana · 1816 days ago · 2 km deep · 14 km away
  9. 1.938 km WNW of Hebgen Lake Estates, Montana · 1811 days ago · 10 km deep · 97 km away
  10. 1.640 km SW of Dillon, Montana · 1809 days ago · 3 km deep · 14 km away
  11. 1.640 km SW of Dillon, Montana · 1808 days ago · 7 km deep · 11 km away
  12. 1.517 km SSW of Lima, Montana · 1806 days ago · 4 km deep · 51 km away

Before

  1. 1.743 km W of Hebgen Lake Estates, Montana · 1869 days ago · 8 km deep · 93 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb80520994. Read Mon, Oct 5, 2026, 12:55 PM UTC.