Montana earthquakes

M1.5 earthquake 1 km ENE of Toston, Montana

A magnitude 1.5 earthquake struck 1 km ENE of Toston, Montana on Sun, Apr 11, 2021, 3:46 AM MDT (09:46 UTC), 1 km (0 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
1.5 (Md, duration), micro
Magnitude from
Montana Bureau of Mines and Geology
Local time
UTC
2021-04-11 09:46:02 UTC
Depth
0.6 km (0.4 mi), shallow
Epicenter
46.175° N, 111.425° 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, 1.5 km in depth
Magnitude uncertainty
±0.23
Depth from
From location
Station coverage gap
125°
Stations used
18

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 14 in the 60 days after this one and 5 in the 30 days before it.

After

  1. 2.210 km NE of Toston, Montana · 1999 days ago · 1 km deep · 9 km away
  2. 1.615 km SW of Radersburg, Montana · 1989 days ago · 6 km deep · 29 km away
  3. 1.914 km SW of Radersburg, Montana · 1989 days ago · 7 km deep · 28 km away
  4. 1.914 km SW of Radersburg, Montana · 1989 days ago · 5 km deep · 28 km away
  5. 2.412 km NNW of Ennis, Montana · 1960 days ago · 1 km deep · 84 km away
  6. 2.313 km NNW of Ennis, Montana · 1960 days ago · 4 km deep · 83 km away
  7. 2.113 km NNW of Ennis, Montana · 1960 days ago · 1 km deep · 84 km away
  8. 1.613 km NNW of Ennis, Montana · 1960 days ago · 5 km deep · 83 km away
  9. 2.36 km ENE of Avon, Montana · 1960 days ago · 2 km deep · 97 km away
  10. 2.32 km WNW of East Helena, Montana · 1955 days ago · 6 km deep · 62 km away · felt by 2
  11. 1.617 km W of Pony, Montana · 1952 days ago · 4 km deep · 77 km away
  12. 1.58 km ENE of Toston, Montana · 1947 days ago · -3 km deep · 8 km away
  13. 2.25 km WSW of Ponderosa Pines, Montana · 1944 days ago · 7 km deep · 19 km away
  14. 1.65 km SW of Ponderosa Pines, Montana · 1943 days ago · 0 km deep · 20 km away

Before

  1. 2.0Western Montana · 2005 days ago · 0 km deep · 77 km away
  2. 1.62 km E of Logan, Montana · 2017 days ago · 12 km deep · 33 km away
  3. 1.75 km ENE of Logan, Montana · 2021 days ago · 4 km deep · 30 km away
  4. 2.25 km SW of Elliston, Montana · 2023 days ago · 17 km deep · 90 km away
  5. 2.55 km SW of Elliston, Montana · 2025 days ago · 20 km deep · 91 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb80496009. Read Mon, Oct 5, 2026, 5:38 AM UTC.