M1.6 earthquake 13 km NNW of Ennis, Montana

Magnitude

1.6 (ML, local (Richter)), micro

Magnitude from

Montana Bureau of Mines and Geology

Local time

Mon, May 24, 2021, 8:44 AM MDT

UTC

2021-05-24 14:44:02 UTC

Depth

5.0 km (3.1 mi), shallow

Epicenter

45.467° N, 111.765° W

Region

Montana

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.6 km horizontally, 31.6 km in depth

Magnitude uncertainty

±0.12

Depth from

Operator assigned

Station coverage gap

184°, poorly surrounded by stations

Stations used

6

• Ennis, MontanaPopulation 884. Forecast13 kmNNW
• Bozeman, MontanaPopulation 43,405. Forecast61 kmWSW
• Billings, MontanaPopulation 117,116. Forecast256 kmW
• Calgary, CanadaPopulation 1,306,784. Forecast644 kmSSE

After

1. 1.57 km WSW of Ennis, MontanaSun, May 30, 12:17 AM MDT · 1954 days ago · 12 km deep · 18 km away
2. 1.617 km W of Pony, MontanaMon, May 31, 4:06 PM MDT · 1953 days ago · 4 km deep · 36 km away
3. 2.317 km N of Dillon, MontanaWed, Jun 2, 2:23 PM MDT · 1951 days ago · 8 km deep · 65 km away
4. 1.58 km ENE of Toston, MontanaSat, Jun 5, 1:18 PM MDT · 1948 days ago · -3 km deep · 89 km away
5. 2.25 km WSW of Ponderosa Pines, MontanaWed, Jun 9, 11:53 AM MDT · 1944 days ago · 7 km deep · 66 km away
6. 1.65 km SW of Ponderosa Pines, MontanaWed, Jun 9, 6:11 PM MDT · 1944 days ago · 0 km deep · 65 km away
7. 1.538 km WNW of Hebgen Lake Estates, MontanaThu, Jun 10, 11:23 PM MDT · 1942 days ago · 11 km deep · 67 km away
8. 2.22 km SE of Three Forks, MontanaMon, Jun 21, 8:32 PM MDT · 1931 days ago · 2 km deep · 49 km away
9. 1.718 km NNE of Dillon, MontanaFri, Jun 25, 5:48 AM MDT · 1928 days ago · 7 km deep · 65 km away
10. 1.57 km NNE of Big Sky, MontanaSun, Jun 27, 1:29 PM MDT · 1926 days ago · 9 km deep · 36 km away
11. 1.69 km E of Hebgen Lake Estates, MontanaTue, Jun 29, 2:38 PM MDT · 1924 days ago · 11 km deep · 95 km away
12. 1.95 km ESE of Hebgen Lake Estates, MontanaWed, Jun 30, 3:21 PM MDT · 1923 days ago · 12 km deep · 94 km away
13. 1.614 km SSE of Elkhorn, MontanaSat, Jul 3, 1:14 PM MDT · 1920 days ago · 6 km deep · 76 km away
14. 1.82 km N of Pony, MontanaSun, Jul 4, 7:03 AM MDT · 1919 days ago · 3 km deep · 26 km away
15. 1.615 km ESE of Harrison, MontanaThu, Jul 8, 2:36 PM MDT · 1915 days ago · 5 km deep · 25 km away
16. 2.730 km W of Hebgen Lake Estates, MontanaSun, Jul 11, 6:26 AM MDT · 1912 days ago · 10 km deep · 75 km away
17. 2.316 km SSW of Radersburg, MontanaSun, Jul 11, 4:39 PM MDT · 1912 days ago · 4 km deep · 67 km away
18. 2.127 km W of Dillon, MontanaMon, Jul 12, 3:14 AM MDT · 1911 days ago · 3 km deep · 100 km away
19. 1.618 km NNE of Dillon, MontanaMon, Jul 12, 9:19 AM MDT · 1911 days ago · 7 km deep · 65 km away
20. 1.62 km SSE of Hebgen Lake Estates, MontanaTue, Jul 13, 8:21 PM MDT · 1909 days ago · 13 km deep · 92 km away
21. 2.212 km NNW of Ennis, MontanaWed, Jul 14, 8:38 PM MDT · 1908 days ago · 3 km deep · 1 km away
22. 2.523 km SE of Virginia City, MontanaSun, Jul 18, 5:16 PM MDT · 1905 days ago · 8 km deep · 38 km away · felt by 2
23. 1.821 km N of Hebgen Lake Estates, MontanaTue, Jul 20, 8:19 AM MDT · 1903 days ago · 3 km deep · 72 km away
24. 1.828 km SSE of Virginia City, MontanaWed, Jul 21, 7:27 PM MDT · 1902 days ago · 7 km deep · 46 km away
25. 1.628 km S of Ennis, MontanaWed, Jul 21, 9:55 PM MDT · 1901 days ago · 11 km deep · 42 km away

Before

1. 2.113 km NNW of Ennis, MontanaMon, May 24, 8:39 AM MDT · 1960 days ago · 1 km deep · 1 km away
2. 2.313 km NNW of Ennis, MontanaSun, May 23, 8:56 PM MDT · 1960 days ago · 4 km deep · 0 km away
3. 2.412 km NNW of Ennis, MontanaSun, May 23, 8:14 PM MDT · 1960 days ago · 1 km deep · 1 km away
4. 1.710 km SW of Twin Bridges, MontanaSun, May 16, 9:23 AM MDT · 1968 days ago · 7 km deep · 52 km away
5. 1.52 km NW of Alder, MontanaFri, May 7, 9:17 AM MDT · 1977 days ago · 11 km deep · 32 km away
6. 1.73 km NW of Alder, MontanaFri, May 7, 7:03 AM MDT · 1977 days ago · 9 km deep · 32 km away
7. 2.14 km NNW of Alder, MontanaFri, May 7, 6:54 AM MDT · 1977 days ago · 4 km deep · 31 km away
8. 2.23 km NW of Alder, MontanaFri, May 7, 6:54 AM MDT · 1977 days ago · 11 km deep · 32 km away
9. 2.523 km NE of West Yellowstone, MontanaTue, Apr 27, 3:07 AM MDT · 1987 days ago · 11 km deep · 100 km away
10. 2.341 km NW of Island Park, IdahoSun, Apr 25, 9:36 PM MDT · 1988 days ago · 15 km deep · 88 km away
11. 1.914 km SW of Radersburg, MontanaSun, Apr 25, 11:05 AM MDT · 1989 days ago · 5 km deep · 73 km away
12. 1.914 km SW of Radersburg, MontanaSun, Apr 25, 8:23 AM MDT · 1989 days ago · 7 km deep · 72 km away
13. 1.615 km SW of Radersburg, MontanaSun, Apr 25, 2:33 AM MDT · 1989 days ago · 6 km deep · 71 km away

From the USGS Earthquake Hazards Program and its partner networks, event mb80505374. Read Mon, Oct 5, 2026, 1:38 PM UTC.