Montana earthquakes

M2.2 earthquake 3 km NW of Alder, Montana

A magnitude 2.2 earthquake struck 3 km NW of Alder, Montana on Fri, May 7, 2021, 6:54 AM MDT (12:54 UTC), 11 km (7 mi) below the surface.

A larger quake followed: M2.4 12 km NNW of Ennis, 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
2.2 (ML, local (Richter)), micro
Magnitude from
Montana Bureau of Mines and Geology
Local time
UTC
2021-05-07 12:54:13 UTC
Depth
10.9 km (6.8 mi), shallow
Epicenter
45.346° N, 112.137° 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, 0.5 km in depth
Magnitude uncertainty
±0.20
Depth from
From location
Station coverage gap
49°
Stations used
36

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 19 in the 60 days after this one and 6 in the 30 days before it.

After

  1. 2.14 km NNW of Alder, Montana · 1977 days ago · 4 km deep · 2 km away
  2. 1.73 km NW of Alder, Montana · 1977 days ago · 9 km deep · 0 km away
  3. 1.52 km NW of Alder, Montana · 1977 days ago · 11 km deep · 1 km away
  4. 1.710 km SW of Twin Bridges, Montana · 1968 days ago · 7 km deep · 28 km away
  5. 2.412 km NNW of Ennis, Montana · 1960 days ago · 1 km deep · 31 km away
  6. 2.313 km NNW of Ennis, Montana · 1960 days ago · 4 km deep · 32 km away
  7. 2.113 km NNW of Ennis, Montana · 1960 days ago · 1 km deep · 31 km away
  8. 1.613 km NNW of Ennis, Montana · 1960 days ago · 5 km deep · 32 km away
  9. 1.57 km WSW of Ennis, Montana · 1954 days ago · 12 km deep · 26 km away
  10. 1.617 km W of Pony, Montana · 1952 days ago · 4 km deep · 37 km away
  11. 2.317 km N of Dillon, Montana · 1950 days ago · 8 km deep · 36 km away
  12. 2.25 km WSW of Ponderosa Pines, Montana · 1944 days ago · 7 km deep · 92 km away
  13. 1.65 km SW of Ponderosa Pines, Montana · 1943 days ago · 0 km deep · 91 km away
  14. 1.538 km WNW of Hebgen Lake Estates, Montana · 1942 days ago · 11 km deep · 65 km away
  15. 2.22 km SE of Three Forks, Montana · 1931 days ago · 2 km deep · 76 km away
  16. 1.718 km NNE of Dillon, Montana · 1928 days ago · 7 km deep · 35 km away
  17. 1.57 km NNE of Big Sky, Montana · 1926 days ago · 9 km deep · 63 km away
  18. 1.614 km SSE of Elkhorn, Montana · 1920 days ago · 6 km deep · 91 km away
  19. 1.82 km N of Pony, Montana · 1919 days ago · 3 km deep · 41 km away

Before

  1. 2.341 km NW of Island Park, Idaho · 1988 days ago · 15 km deep · 80 km away
  2. 1.914 km SW of Radersburg, Montana · 1989 days ago · 5 km deep · 91 km away
  3. 1.914 km SW of Radersburg, Montana · 1989 days ago · 7 km deep · 90 km away
  4. 1.615 km SW of Radersburg, Montana · 1989 days ago · 6 km deep · 89 km away
  5. 2.036 km NNE of Spencer, Idaho · 1998 days ago · 3 km deep · 77 km away
  6. 1.815 km NE of Dillon, Montana · 2003 days ago · 6 km deep · 28 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb80501054. Read Mon, Oct 5, 2026, 7:40 AM UTC.