M1.8 earthquake 41 km SSE of Mammoth, Wyoming

Magnitude

1.8 (ML, local (Richter)), micro

Magnitude from

University of Utah Seismograph Stations

Local time

Sat, Sep 4, 2021, 3:23 PM MDT

UTC

2021-09-04 21:23:56 UTC

Depth

4.4 km (2.7 mi), shallow

Epicenter

44.653° N, 110.433° W

Region

Montana

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.4 km horizontally, 0.7 km in depth

Magnitude uncertainty

±0.24

Depth from

From location

Station coverage gap

133°

Stations used

15

• Gardiner, MontanaPopulation 875. Forecast47 kmSSE
• Bozeman, MontanaPopulation 43,405. Forecast124 kmSSE
• Billings, MontanaPopulation 117,116. Forecast197 kmSW
• Calgary, CanadaPopulation 1,306,784. Forecast762 kmSSE

After

1. 1.641 km SSE of Mammoth, WyomingSat, Sep 4, 5:23 PM MDT · 1856 days ago · 8 km deep · 2 km away
2. 1.545 km ENE of Warm River, IdahoWed, Sep 8, 10:50 AM MDT · 1852 days ago · 15 km deep · 52 km away
3. 3.244 km ENE of Warm River, IdahoWed, Sep 8, 11:01 AM MDT · 1852 days ago · 5 km deep · 54 km away
4. 2.141 km ENE of Warm River, IdahoWed, Sep 8, 11:05 AM MDT · 1852 days ago · 6 km deep · 56 km away
5. 1.642 km ENE of Warm River, IdahoWed, Sep 8, 11:07 AM MDT · 1852 days ago · 5 km deep · 55 km away
6. 1.643 km ENE of Warm River, IdahoWed, Sep 8, 11:12 AM MDT · 1852 days ago · 7 km deep · 54 km away
7. 1.943 km ENE of Warm River, IdahoWed, Sep 8, 11:17 AM MDT · 1852 days ago · 7 km deep · 54 km away
8. 2.343 km ENE of Warm River, IdahoWed, Sep 8, 11:18 AM MDT · 1852 days ago · 5 km deep · 54 km away · felt by 1
9. 1.6WyomingWed, Sep 8, 11:39 AM MDT · 1852 days ago · 6 km deep · 55 km away
10. 3.044 km ENE of Warm River, IdahoWed, Sep 8, 12:00 PM MDT · 1852 days ago · 11 km deep · 54 km away · felt by 1
11. 2.08 km ESE of Hebgen Lake Estates, MontanaSat, Sep 11, 9:51 AM MDT · 1849 days ago · 12 km deep · 53 km away
12. 1.724 km SE of Mammoth, WyomingTue, Sep 14, 10:32 PM MDT · 1846 days ago · 12 km deep · 20 km away
13. 1.729 km ESE of West Yellowstone, MontanaThu, Sep 16, 3:05 AM MDT · 1844 days ago · 7 km deep · 26 km away
14. 1.629 km E of West Yellowstone, MontanaSun, Sep 19, 12:00 AM MDT · 1842 days ago · 7 km deep · 24 km away
15. 1.729 km E of West Yellowstone, MontanaSun, Sep 19, 12:19 AM MDT · 1842 days ago · 7 km deep · 24 km away
16. 2.215 km ENE of Hebgen Lake Estates, MontanaMon, Sep 20, 5:18 PM MDT · 1840 days ago · 8 km deep · 48 km away
17. 1.629 km E of West Yellowstone, MontanaWed, Sep 22, 8:00 AM MDT · 1838 days ago · 9 km deep · 24 km away
18. 1.529 km E of West Yellowstone, MontanaWed, Sep 22, 9:09 AM MDT · 1838 days ago · 6 km deep · 24 km away
19. 1.720 km NE of West Yellowstone, MontanaWed, Sep 22, 3:49 PM MDT · 1838 days ago · 7 km deep · 42 km away
20. 1.829 km E of West Yellowstone, MontanaWed, Sep 22, 6:53 PM MDT · 1838 days ago · 7 km deep · 24 km away
21. 2.016 km ENE of Hebgen Lake Estates, MontanaFri, Sep 24, 12:37 PM MDT · 1836 days ago · 8 km deep · 47 km away
22. 1.731 km E of West Yellowstone, MontanaSun, Sep 26, 9:11 PM MDT · 1834 days ago · 6 km deep · 23 km away
23. 1.631 km ESE of West Yellowstone, MontanaSun, Sep 26, 10:12 PM MDT · 1834 days ago · 5 km deep · 23 km away
24. 1.631 km ESE of West Yellowstone, MontanaSun, Sep 26, 10:13 PM MDT · 1834 days ago · 3 km deep · 24 km away
25. 1.731 km E of West Yellowstone, MontanaSun, Sep 26, 10:17 PM MDT · 1834 days ago · 8 km deep · 22 km away
26. 1.728 km S of Mammoth, WyomingMon, Sep 27, 4:19 AM MDT · 1833 days ago · 4 km deep · 21 km away
27. 1.659 km ESE of West Yellowstone, MontanaWed, Sep 29, 5:52 AM MDT · 1831 days ago · 7 km deep · 23 km away
28. 1.659 km ESE of West Yellowstone, MontanaWed, Sep 29, 6:28 AM MDT · 1831 days ago · 8 km deep · 23 km away
29. 1.960 km ESE of West Yellowstone, MontanaThu, Sep 30, 12:05 AM MDT · 1831 days ago · 8 km deep · 23 km away
30. 1.829 km E of West Yellowstone, MontanaThu, Sep 30, 8:40 PM MDT · 1830 days ago · 8 km deep · 24 km away
31. 1.913 km E of Hebgen Lake Estates, MontanaFri, Oct 1, 11:44 AM MDT · 1829 days ago · 8 km deep · 49 km away
32. 2.017 km ENE of West Yellowstone, MontanaSat, Oct 2, 12:06 AM MDT · 1829 days ago · 10 km deep · 40 km away
33. 1.821 km W of Hebgen Lake Estates, MontanaSat, Oct 2, 12:22 PM MDT · 1828 days ago · 11 km deep · 83 km away
34. 1.836 km S of Silver Gate, MontanaSat, Oct 2, 8:08 PM MDT · 1828 days ago · 3 km deep · 30 km away
35. 1.824 km SSE of Mammoth, WyomingMon, Oct 4, 3:33 PM MDT · 1826 days ago · 5 km deep · 20 km away
36. 2.5WyomingMon, Oct 4, 4:37 PM MDT · 1826 days ago · 4 km deep · 19 km away
37. 1.624 km SSE of Mammoth, WyomingMon, Oct 4, 4:39 PM MDT · 1826 days ago · 3 km deep · 20 km away
38. 2.425 km SSE of Mammoth, WyomingMon, Oct 4, 4:39 PM MDT · 1826 days ago · 5 km deep · 19 km away
39. 2.024 km SSE of Mammoth, WyomingMon, Oct 4, 4:41 PM MDT · 1826 days ago · 3 km deep · 20 km away
40. 2.224 km SSE of Mammoth, WyomingMon, Oct 4, 4:41 PM MDT · 1826 days ago · 3 km deep · 20 km away
41. 2.325 km SSE of Mammoth, WyomingMon, Oct 4, 5:38 PM MDT · 1826 days ago · 4 km deep · 19 km away
42. 1.625 km SSE of Mammoth, WyomingMon, Oct 4, 5:50 PM MDT · 1826 days ago · 5 km deep · 19 km away
43. 1.625 km SSE of Mammoth, WyomingMon, Oct 4, 5:54 PM MDT · 1826 days ago · 4 km deep · 20 km away
44. 1.623 km SSE of Mammoth, WyomingMon, Oct 4, 5:57 PM MDT · 1826 days ago · 2 km deep · 20 km away
45. 2.625 km SSE of Mammoth, WyomingMon, Oct 4, 6:30 PM MDT · 1826 days ago · 5 km deep · 19 km away
46. 1.524 km SSE of Mammoth, WyomingTue, Oct 5, 7:53 AM MDT · 1825 days ago · 2 km deep · 20 km away
47. 1.524 km SSE of Mammoth, WyomingTue, Oct 5, 8:15 AM MDT · 1825 days ago · 5 km deep · 20 km away
48. 1.625 km SSE of Mammoth, WyomingTue, Oct 5, 8:24 AM MDT · 1825 days ago · 5 km deep · 20 km away
49. 1.523 km SSE of Mammoth, WyomingTue, Oct 5, 8:34 AM MDT · 1825 days ago · 4 km deep · 20 km away
50. 1.760 km SE of West Yellowstone, MontanaSat, Oct 9, 4:42 PM MDT · 1821 days ago · 4 km deep · 35 km away
51. 1.528 km E of West Yellowstone, MontanaSun, Oct 10, 5:10 AM MDT · 1820 days ago · 8 km deep · 25 km away
52. 1.528 km E of West Yellowstone, MontanaSun, Oct 10, 5:13 AM MDT · 1820 days ago · 8 km deep · 25 km away
53. 1.665 km ESE of West Yellowstone, MontanaThu, Oct 14, 1:42 AM MDT · 1816 days ago · 7 km deep · 26 km away
54. 1.666 km ESE of West Yellowstone, MontanaThu, Oct 14, 2:03 AM MDT · 1816 days ago · 7 km deep · 26 km away
55. 1.647 km W of Cody, WyomingSun, Oct 17, 2:17 AM MDT · 1813 days ago · 9 km deep · 62 km away
56. 1.647 km ESE of West Yellowstone, MontanaMon, Oct 18, 9:57 AM MDT · 1812 days ago · 5 km deep · 19 km away
57. 1.938 km WNW of Hebgen Lake Estates, MontanaTue, Oct 19, 9:32 PM MDT · 1811 days ago · 10 km deep · 99 km away
58. 1.751 km SE of West Yellowstone, MontanaWed, Oct 20, 8:47 AM MDT · 1810 days ago · 4 km deep · 39 km away
59. 1.922 km S of Mammoth, WyomingSun, Oct 24, 6:52 AM MDT · 1806 days ago · 4 km deep · 26 km away
60. 1.632 km ESE of West Yellowstone, MontanaSun, Oct 24, 7:05 AM MDT · 1806 days ago · 6 km deep · 24 km away

The first 60 of 73.

Before

1. 3.041 km SSE of Mammoth, WyomingFri, Sep 3, 11:51 PM MDT · 1857 days ago · 6 km deep · 1 km away · felt by 9
2. 2.641 km SSE of Mammoth, WyomingFri, Sep 3, 11:51 PM MDT · 1857 days ago · 5 km deep · 0 km away
3. 1.834 km SSE of Mammoth, WyomingSat, Aug 21, 3:24 PM MDT · 1870 days ago · 4 km deep · 12 km away
4. 1.525 km SE of Mammoth, WyomingSat, Aug 21, 9:41 AM MDT · 1870 days ago · 7 km deep · 19 km away
5. 1.719 km NE of West Yellowstone, MontanaFri, Aug 20, 11:23 AM MDT · 1871 days ago · 7 km deep · 42 km away
6. 3.019 km NE of West Yellowstone, MontanaFri, Aug 20, 11:00 AM MDT · 1871 days ago · 9 km deep · 42 km away
7. 1.733 km SE of West Yellowstone, MontanaSat, Aug 14, 11:03 AM MDT · 1877 days ago · 4 km deep · 34 km away
8. 1.639 km SSE of Mammoth, WyomingFri, Aug 6, 5:25 PM MDT · 1885 days ago · 6 km deep · 4 km away
9. 2.027 km S of Mammoth, WyomingThu, Aug 5, 11:41 PM MDT · 1886 days ago · 4 km deep · 22 km away

From the USGS Earthquake Hazards Program and its partner networks, event uu60456562. Read Sun, Oct 4, 2026, 6:50 PM UTC.