Montana earthquakes

M1.7 earthquake 5 km ENE of Logan, Montana

A magnitude 1.7 earthquake struck 5 km ENE of Logan, Montana on Tue, Mar 23, 2021, 11:16 PM MDT (05:16 UTC), 4 km (3 mi) below the surface.

A larger quake followed: M2.2 3 km NW of Alder, 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
1.7 (ML, local (Richter)), micro
Magnitude from
Montana Bureau of Mines and Geology
Local time
UTC
2021-03-24 05:16:58 UTC
Depth
4.5 km (2.8 mi), shallow
Epicenter
45.909° N, 111.366° 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, 10.5 km in depth
Magnitude uncertainty
±0.15
Depth from
Operator assigned
Station coverage gap
87°
Stations used
14

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 6 in the 30 days before it.

After

  1. 1.62 km E of Logan, Montana · 2017 days ago · 12 km deep · 4 km away
  2. 1.87 km W of Sheridan, Montana · 2009 days ago · 10 km deep · 87 km away
  3. 1.51 km ENE of Toston, Montana · 2003 days ago · 1 km deep · 30 km away
  4. 2.210 km NE of Toston, Montana · 1999 days ago · 1 km deep · 37 km away
  5. 1.615 km SW of Radersburg, Montana · 1989 days ago · 6 km deep · 39 km away
  6. 1.914 km SW of Radersburg, Montana · 1989 days ago · 7 km deep · 40 km away
  7. 1.914 km SW of Radersburg, Montana · 1989 days ago · 5 km deep · 40 km away
  8. 2.23 km NW of Alder, Montana · 1977 days ago · 11 km deep · 87 km away
  9. 2.14 km NNW of Alder, Montana · 1977 days ago · 4 km deep · 85 km away
  10. 1.73 km NW of Alder, Montana · 1977 days ago · 9 km deep · 87 km away
  11. 1.52 km NW of Alder, Montana · 1977 days ago · 11 km deep · 87 km away
  12. 1.710 km SW of Twin Bridges, Montana · 1968 days ago · 7 km deep · 95 km away

Before

  1. 1.617 km NNW of Ennis, Montana · 2034 days ago · 9 km deep · 59 km away
  2. 2.119 km W of Pony, Montana · 2036 days ago · 5 km deep · 65 km away
  3. 1.632 km S of Ennis, Montana · 2036 days ago · 8 km deep · 97 km away
  4. 1.87 km WSW of Willow Creek, Montana · 2037 days ago · 2 km deep · 31 km away
  5. 1.9Western Montana · 2040 days ago · 6 km deep · 14 km away
  6. 1.69 km SW of Radersburg, Montana · 2046 days ago · 4 km deep · 36 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb80492774. Read Mon, Oct 5, 2026, 12:01 PM UTC.