Montana earthquakes

M1.9 earthquake 12 km NNW of Ennis, Montana

A magnitude 1.9 earthquake struck 12 km NNW of Ennis, Montana on Wed, Jul 28, 2021, 3:42 PM MDT (21:42 UTC), 1 km (1 mi) below the surface.

A larger quake followed: M3.0 19 km NE of West Yellowstone, Montana. This one was a foreshock.

Ennis 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
1.9 (ML, local (Richter)), micro
Magnitude from
Montana Bureau of Mines and Geology
Local time
UTC
2021-07-28 21:42:42 UTC
Depth
1.2 km (0.7 mi), shallow
Epicenter
45.459° N, 111.776° 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, 1.9 km in depth
Magnitude uncertainty
±0.20
Depth from
From location
Station coverage gap
45°
Stations used
22

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 16 in the 60 days after this one and 16 in the 30 days before it.

After

  1. 1.519 km N of Dillon, Montana · 1894 days ago · 9 km deep · 68 km away
  2. 2.03 km W of Pony, Montana · 1893 days ago · 0 km deep · 25 km away
  3. 2.05 km NNE of Willow Creek, Montana · 1878 days ago · 1 km deep · 47 km away
  4. 3.019 km NE of West Yellowstone, Montana · 1872 days ago · 9 km deep · 100 km away
  5. 1.719 km NE of West Yellowstone, Montana · 1872 days ago · 7 km deep · 100 km away
  6. 1.743 km W of Hebgen Lake Estates, Montana · 1869 days ago · 8 km deep · 78 km away
  7. 2.128 km SSE of Virginia City, Montana · 1860 days ago · 11 km deep · 46 km away
  8. 1.69 km NNE of Three Forks, Montana · 1858 days ago · 10 km deep · 61 km away
  9. 2.235 km NNE of Spencer, Idaho · 1857 days ago · 10 km deep · 93 km away
  10. 1.538 km SSW of Virginia City, Montana · 1856 days ago · 5 km deep · 61 km away
  11. 2.08 km ESE of Hebgen Lake Estates, Montana · 1850 days ago · 12 km deep · 96 km away
  12. 1.63 km WNW of Ponderosa Pines, Montana · 1841 days ago · 8 km deep · 70 km away
  13. 2.215 km ENE of Hebgen Lake Estates, Montana · 1840 days ago · 8 km deep · 95 km away
  14. 1.720 km NE of West Yellowstone, Montana · 1838 days ago · 7 km deep · 100 km away
  15. 2.016 km ENE of Hebgen Lake Estates, Montana · 1837 days ago · 8 km deep · 95 km away
  16. 1.64 km S of Elkhorn, Montana · 1835 days ago · 6 km deep · 87 km away

Before

  1. 1.828 km SSE of Virginia City, Montana · 1899 days ago · 7 km deep · 45 km away
  2. 1.628 km S of Ennis, Montana · 1901 days ago · 11 km deep · 41 km away
  3. 1.828 km SSE of Virginia City, Montana · 1901 days ago · 7 km deep · 45 km away
  4. 1.821 km N of Hebgen Lake Estates, Montana · 1903 days ago · 3 km deep · 72 km away
  5. 2.523 km SE of Virginia City, Montana · 1904 days ago · 8 km deep · 37 km away · felt by 2
  6. 2.212 km NNW of Ennis, Montana · 1908 days ago · 3 km deep · 0 km away
  7. 1.62 km SSE of Hebgen Lake Estates, Montana · 1909 days ago · 13 km deep · 92 km away
  8. 1.618 km NNE of Dillon, Montana · 1911 days ago · 7 km deep · 64 km away
  9. 2.127 km W of Dillon, Montana · 1911 days ago · 3 km deep · 99 km away
  10. 2.316 km SSW of Radersburg, Montana · 1911 days ago · 4 km deep · 68 km away
  11. 2.730 km W of Hebgen Lake Estates, Montana · 1912 days ago · 10 km deep · 74 km away
  12. 1.615 km ESE of Harrison, Montana · 1915 days ago · 5 km deep · 26 km away
  13. 1.82 km N of Pony, Montana · 1919 days ago · 3 km deep · 26 km away
  14. 1.614 km SSE of Elkhorn, Montana · 1920 days ago · 6 km deep · 77 km away
  15. 1.95 km ESE of Hebgen Lake Estates, Montana · 1922 days ago · 12 km deep · 94 km away
  16. 1.69 km E of Hebgen Lake Estates, Montana · 1924 days ago · 11 km deep · 95 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event mb80517384. Read Mon, Oct 5, 2026, 8:37 AM UTC.