Montana earthquakes

M1.8 earthquake 15 km NE of Dillon, Montana

A magnitude 1.8 earthquake struck 15 km NE of Dillon, Montana on Sun, Apr 11, 2021, 12:18 AM MDT (06:18 UTC), 6 km (3 mi) below the surface.

A larger quake followed: M2.5 21 km SW of Lima, Montana. 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
1.8 (ML, local (Richter)), micro
Magnitude from
Montana Bureau of Mines and Geology
Local time
UTC
2021-04-11 06:18:59 UTC
Depth
5.5 km (3.4 mi), shallow
Epicenter
45.316° N, 112.497° 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 0.4 km horizontally, 1.4 km in depth
Magnitude uncertainty
±0.07
Depth from
From location
Station coverage gap
90°
Stations used
13

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 15 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 2.036 km NNE of Spencer, Idaho · 1998 days ago · 3 km deep · 83 km away
  2. 2.341 km NW of Island Park, Idaho · 1988 days ago · 15 km deep · 92 km away
  3. 2.23 km NW of Alder, Montana · 1977 days ago · 11 km deep · 28 km away
  4. 2.14 km NNW of Alder, Montana · 1977 days ago · 4 km deep · 29 km away
  5. 1.73 km NW of Alder, Montana · 1977 days ago · 9 km deep · 28 km away
  6. 1.52 km NW of Alder, Montana · 1977 days ago · 11 km deep · 29 km away
  7. 1.710 km SW of Twin Bridges, Montana · 1968 days ago · 7 km deep · 20 km away
  8. 2.521 km SW of Lima, Montana · 1968 days ago · 8 km deep · 94 km away · felt by 1
  9. 2.412 km NNW of Ennis, Montana · 1960 days ago · 1 km deep · 59 km away
  10. 2.313 km NNW of Ennis, Montana · 1960 days ago · 4 km deep · 59 km away
  11. 2.113 km NNW of Ennis, Montana · 1960 days ago · 1 km deep · 59 km away
  12. 1.613 km NNW of Ennis, Montana · 1960 days ago · 5 km deep · 60 km away
  13. 1.57 km WSW of Ennis, Montana · 1954 days ago · 12 km deep · 54 km away
  14. 1.617 km W of Pony, Montana · 1953 days ago · 4 km deep · 49 km away
  15. 2.317 km N of Dillon, Montana · 1951 days ago · 8 km deep · 10 km away

Before

  1. 2.029 km SSE of Virginia City, Montana · 2007 days ago · 3 km deep · 63 km away
  2. 1.87 km W of Sheridan, Montana · 2009 days ago · 10 km deep · 23 km away
  3. 1.63 km ENE of Lima, Montana · 2016 days ago · 6 km deep · 75 km away
  4. 2.427 km WNW of Hebgen Lake Estates, Montana · 2030 days ago · 13 km deep · 94 km away
  5. 1.628 km WNW of Hebgen Lake Estates, Montana · 2031 days ago · 13 km deep · 93 km away
  6. 1.627 km WNW of Hebgen Lake Estates, Montana · 2032 days ago · 12 km deep · 94 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb80495999. Read Mon, Oct 5, 2026, 12:02 PM UTC.