M1.6 earthquake 25 km SSE of Mammoth, Wyoming

Magnitude

1.6 (ML, local (Richter)), micro

Magnitude from

University of Utah Seismograph Stations

Local time

Tue, Oct 5, 2021, 8:24 AM MDT

UTC

2021-10-05 14:24:56 UTC

Depth

5.3 km (3.3 mi), shallow

Epicenter

44.755° N, 110.638° W

Region

Montana

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.8 km horizontally, 1.2 km in depth

Magnitude uncertainty

±0.09

Depth from

From location

Station coverage gap

189°, poorly surrounded by stations

Stations used

10

• Gardiner, MontanaPopulation 875. Forecast31 kmS
• Bozeman, MontanaPopulation 43,405. Forecast108 kmSSE
• Billings, MontanaPopulation 117,116. Forecast203 kmWSW
• Calgary, CanadaPopulation 1,306,784. Forecast745 kmSSE

After

1. 1.523 km SSE of Mammoth, WyomingTue, Oct 5, 8:34 AM MDT · 1826 days ago · 4 km deep · 2 km away
2. 1.760 km SE of West Yellowstone, MontanaSat, Oct 9, 4:42 PM MDT · 1821 days ago · 4 km deep · 48 km away
3. 1.528 km E of West Yellowstone, MontanaSun, Oct 10, 5:10 AM MDT · 1821 days ago · 8 km deep · 14 km away
4. 1.528 km E of West Yellowstone, MontanaSun, Oct 10, 5:13 AM MDT · 1821 days ago · 8 km deep · 14 km away
5. 1.665 km ESE of West Yellowstone, MontanaThu, Oct 14, 1:42 AM MDT · 1817 days ago · 7 km deep · 44 km away
6. 1.666 km ESE of West Yellowstone, MontanaThu, Oct 14, 2:03 AM MDT · 1817 days ago · 7 km deep · 43 km away
7. 1.647 km W of Cody, WyomingSun, Oct 17, 2:17 AM MDT · 1814 days ago · 9 km deep · 81 km away
8. 1.647 km ESE of West Yellowstone, MontanaMon, Oct 18, 9:57 AM MDT · 1813 days ago · 5 km deep · 29 km away
9. 1.938 km WNW of Hebgen Lake Estates, MontanaTue, Oct 19, 9:32 PM MDT · 1811 days ago · 10 km deep · 81 km away
10. 1.751 km SE of West Yellowstone, MontanaWed, Oct 20, 8:47 AM MDT · 1811 days ago · 4 km deep · 46 km away
11. 1.922 km S of Mammoth, WyomingSun, Oct 24, 6:52 AM MDT · 1807 days ago · 4 km deep · 6 km away
12. 1.632 km ESE of West Yellowstone, MontanaSun, Oct 24, 7:05 AM MDT · 1807 days ago · 6 km deep · 21 km away
13. 1.631 km ESE of West Yellowstone, MontanaSun, Oct 24, 7:05 AM MDT · 1807 days ago · 7 km deep · 21 km away
14. 1.629 km S of Mammoth, WyomingSun, Oct 24, 8:08 PM MDT · 1806 days ago · 5 km deep · 6 km away
15. 1.829 km S of Mammoth, WyomingSun, Oct 24, 8:24 PM MDT · 1806 days ago · 5 km deep · 5 km away
16. 1.7WyomingSun, Oct 24, 8:32 PM MDT · 1806 days ago · 4 km deep · 6 km away
17. 2.128 km S of Mammoth, WyomingSun, Oct 24, 9:29 PM MDT · 1806 days ago · 5 km deep · 5 km away
18. 1.946 km NE of Alta, WyomingTue, Oct 26, 2:17 PM MDT · 1804 days ago · 10 km deep · 75 km away
19. 1.937 km S of Silver Gate, MontanaWed, Oct 27, 9:19 PM MDT · 1803 days ago · 13 km deep · 49 km away
20. 1.637 km S of Silver Gate, MontanaWed, Oct 27, 9:47 PM MDT · 1803 days ago · 14 km deep · 48 km away
21. 2.336 km S of Silver Gate, MontanaWed, Oct 27, 10:46 PM MDT · 1803 days ago · 13 km deep · 49 km away
22. 2.028 km S of Mammoth, WyomingMon, Nov 1, 12:38 AM MDT · 1799 days ago · 5 km deep · 5 km away
23. 1.727 km S of Mammoth, WyomingMon, Nov 1, 12:39 AM MDT · 1799 days ago · 5 km deep · 4 km away
24. 1.728 km S of Mammoth, WyomingMon, Nov 1, 12:57 AM MDT · 1799 days ago · 4 km deep · 5 km away
25. 1.544 km SE of West Yellowstone, MontanaMon, Nov 1, 11:51 PM MDT · 1798 days ago · 4 km deep · 40 km away
26. 1.927 km S of Mammoth, WyomingSat, Nov 6, 10:38 AM MDT · 1794 days ago · 4 km deep · 4 km away
27. 2.321 km ENE of Hebgen Lake Estates, MontanaMon, Nov 8, 9:23 PM MST · 1791 days ago · 8 km deep · 27 km away
28. 1.526 km W of Hebgen Lake Estates, MontanaTue, Nov 9, 9:06 AM MST · 1791 days ago · 13 km deep · 70 km away
29. 1.621 km ENE of Hebgen Lake Estates, MontanaTue, Nov 9, 11:51 AM MST · 1790 days ago · 7 km deep · 27 km away
30. 2.546 km NE of Alta, WyomingWed, Nov 10, 5:56 AM MST · 1790 days ago · 10 km deep · 75 km away · felt by 1
31. 2.246 km NE of Alta, WyomingWed, Nov 10, 6:15 AM MST · 1790 days ago · 7 km deep · 75 km away
32. 1.540 km SSE of West Yellowstone, MontanaWed, Nov 10, 9:07 PM MST · 1789 days ago · 2 km deep · 48 km away
33. 1.6WyomingWed, Nov 10, 9:09 PM MST · 1789 days ago · 9 km deep · 48 km away
34. 1.727 km S of Mammoth, WyomingFri, Nov 12, 6:45 AM MST · 1788 days ago · 4 km deep · 4 km away
35. 1.846 km NE of Alta, WyomingSat, Nov 13, 12:03 AM MST · 1787 days ago · 10 km deep · 75 km away
36. 1.950 km SSE of Mammoth, WyomingTue, Nov 16, 5:31 AM MST · 1784 days ago · 2 km deep · 27 km away
37. 1.928 km S of Mammoth, WyomingSun, Nov 21, 1:23 AM MST · 1779 days ago · 4 km deep · 5 km away
38. 1.829 km S of Mammoth, WyomingMon, Nov 22, 10:06 AM MST · 1778 days ago · 5 km deep · 6 km away
39. 1.830 km ESE of West Yellowstone, MontanaFri, Nov 26, 8:00 AM MST · 1774 days ago · 8 km deep · 19 km away
40. 1.939 km ESE of West Yellowstone, MontanaSat, Nov 27, 2:00 AM MST · 1773 days ago · 7 km deep · 21 km away
41. 2.419 km NE of West Yellowstone, MontanaSun, Nov 28, 5:00 PM MST · 1771 days ago · 8 km deep · 24 km away
42. 1.946 km ESE of West Yellowstone, MontanaMon, Nov 29, 4:13 PM MST · 1770 days ago · 7 km deep · 25 km away
43. 1.922 km SSW of Mammoth, WyomingWed, Dec 1, 5:15 AM MST · 1769 days ago · 4 km deep · 13 km away

Before

1. 1.524 km SSE of Mammoth, WyomingTue, Oct 5, 8:15 AM MDT · 1826 days ago · 5 km deep · 1 km away
2. 1.524 km SSE of Mammoth, WyomingTue, Oct 5, 7:53 AM MDT · 1826 days ago · 2 km deep · 1 km away
3. 2.625 km SSE of Mammoth, WyomingMon, Oct 4, 6:30 PM MDT · 1826 days ago · 5 km deep · 1 km away
4. 1.623 km SSE of Mammoth, WyomingMon, Oct 4, 5:57 PM MDT · 1826 days ago · 2 km deep · 1 km away
5. 1.625 km SSE of Mammoth, WyomingMon, Oct 4, 5:54 PM MDT · 1826 days ago · 4 km deep · 0 km away
6. 1.625 km SSE of Mammoth, WyomingMon, Oct 4, 5:50 PM MDT · 1826 days ago · 5 km deep · 1 km away
7. 2.325 km SSE of Mammoth, WyomingMon, Oct 4, 5:38 PM MDT · 1826 days ago · 4 km deep · 1 km away
8. 2.224 km SSE of Mammoth, WyomingMon, Oct 4, 4:41 PM MDT · 1826 days ago · 3 km deep · 1 km away
9. 2.024 km SSE of Mammoth, WyomingMon, Oct 4, 4:41 PM MDT · 1826 days ago · 3 km deep · 1 km away
10. 2.425 km SSE of Mammoth, WyomingMon, Oct 4, 4:39 PM MDT · 1826 days ago · 5 km deep · 1 km away
11. 1.624 km SSE of Mammoth, WyomingMon, Oct 4, 4:39 PM MDT · 1826 days ago · 3 km deep · 1 km away
12. 2.5WyomingMon, Oct 4, 4:37 PM MDT · 1826 days ago · 4 km deep · 1 km away
13. 1.824 km SSE of Mammoth, WyomingMon, Oct 4, 3:33 PM MDT · 1826 days ago · 5 km deep · 1 km away
14. 1.836 km S of Silver Gate, MontanaSat, Oct 2, 8:08 PM MDT · 1828 days ago · 3 km deep · 47 km away
15. 1.821 km W of Hebgen Lake Estates, MontanaSat, Oct 2, 12:22 PM MDT · 1828 days ago · 11 km deep · 65 km away
16. 2.017 km ENE of West Yellowstone, MontanaSat, Oct 2, 12:06 AM MDT · 1829 days ago · 10 km deep · 22 km away
17. 1.913 km E of Hebgen Lake Estates, MontanaFri, Oct 1, 11:44 AM MDT · 1829 days ago · 8 km deep · 30 km away
18. 1.829 km E of West Yellowstone, MontanaThu, Sep 30, 8:40 PM MDT · 1830 days ago · 8 km deep · 17 km away
19. 1.960 km ESE of West Yellowstone, MontanaThu, Sep 30, 12:05 AM MDT · 1831 days ago · 8 km deep · 39 km away
20. 1.659 km ESE of West Yellowstone, MontanaWed, Sep 29, 6:28 AM MDT · 1832 days ago · 8 km deep · 39 km away

From the USGS Earthquake Hazards Program and its partner networks, event uu60461642. Read Mon, Oct 5, 2026, 4:40 AM UTC.