Montana earthquakes

M1.5 earthquake 30 km W of Dillon, Montana

A magnitude 1.5 earthquake struck 30 km W of Dillon, Montana on Mon, Jul 12, 2021, 5:06 PM MDT (23:06 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.5 23 km SE of Virginia City, Montana. This one was a foreshock.

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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
2021-07-12 23:06:15 UTC
Depth
5.3 km (3.3 mi), shallow
Epicenter
45.228° N, 113.024° 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, 4.4 km in depth
Magnitude uncertainty
±0.25
Depth from
From location
Station coverage gap
130°
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: 10 in the 60 days after this one and 3 in the 30 days before it.

After

  1. 2.523 km SE of Virginia City, Montana · 1905 days ago · 8 km deep · 99 km away · felt by 2
  2. 1.828 km SSE of Virginia City, Montana · 1901 days ago · 7 km deep · 96 km away
  3. 1.828 km SSE of Virginia City, Montana · 1899 days ago · 7 km deep · 96 km away
  4. 1.519 km N of Dillon, Montana · 1894 days ago · 9 km deep · 35 km away
  5. 2.03 km W of Pony, Montana · 1893 days ago · 0 km deep · 97 km away
  6. 1.537 km SSW of Dillon, Montana · 1864 days ago · 7 km deep · 35 km away
  7. 2.128 km SSE of Virginia City, Montana · 1861 days ago · 11 km deep · 94 km away
  8. 1.538 km SSW of Virginia City, Montana · 1856 days ago · 5 km deep · 77 km away
  9. 2.425 km N of Spencer, Idaho · 1855 days ago · 9 km deep · 100 km away
  10. 2.225 km NNW of Wisdom, Montana · 1855 days ago · 12 km deep · 80 km away

Before

  1. 1.618 km NNE of Dillon, Montana · 1911 days ago · 7 km deep · 38 km away
  2. 2.127 km W of Dillon, Montana · 1911 days ago · 3 km deep · 3 km away
  3. 1.718 km NNE of Dillon, Montana · 1928 days ago · 7 km deep · 38 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb80514679. Read Mon, Oct 5, 2026, 12:00 PM UTC.