M2.3 earthquake 23 km SW of Mammoth, Wyoming

Magnitude

2.3 (ML, local (Richter)), micro

Magnitude from

University of Utah Seismograph Stations

Local time

Thu, Oct 4, 2018, 11:50 PM MDT

UTC

2018-10-05 05:50:51 UTC

Depth

7.1 km (4.4 mi), shallow

Epicenter

44.811° N, 110.879° W

Region

Montana

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.4 km horizontally, 0.8 km in depth

Magnitude uncertainty

±0.17

Depth from

From location

Station coverage gap

49°

Stations used

26

• West Yellowstone, MontanaPopulation 1,339. Forecast24 kmNE
• Bozeman, MontanaPopulation 43,405. Forecast97 kmS
• Billings, MontanaPopulation 117,116. Forecast215 kmWSW
• Calgary, CanadaPopulation 1,306,784. Forecast734 kmSSE

After

1. 1.746 km ENE of Warm River, IdahoSat, Oct 6, 6:31 AM MDT · 2920 days ago · 4 km deep · 65 km away
2. 1.531 km ESE of Island Park, IdahoSat, Oct 6, 10:44 PM MDT · 2920 days ago · 8 km deep · 51 km away
3. 1.545 km SSE of Mammoth, WyomingMon, Oct 8, 5:38 AM MDT · 2918 days ago · 2 km deep · 42 km away
4. 1.745 km ENE of Warm River, IdahoWed, Oct 10, 2:52 PM MDT · 2916 days ago · 6 km deep · 60 km away
5. 2.610 km NNE of West Yellowstone, MontanaSat, Oct 13, 7:52 AM MDT · 2913 days ago · 7 km deep · 14 km away
6. 1.53 km ESE of Big Sky, MontanaMon, Oct 15, 4:14 AM MDT · 2911 days ago · 13 km deep · 62 km away
7. 2.011 km NNE of West Yellowstone, MontanaMon, Oct 15, 1:45 PM MDT · 2911 days ago · 7 km deep · 14 km away
8. 2.212 km NNE of West Yellowstone, MontanaTue, Oct 16, 2:37 AM MDT · 2910 days ago · 9 km deep · 14 km away
9. 1.818 km NE of West Yellowstone, MontanaFri, Oct 19, 6:43 PM MDT · 2907 days ago · 9 km deep · 6 km away
10. 1.518 km NE of West Yellowstone, MontanaFri, Oct 19, 6:57 PM MDT · 2907 days ago · 9 km deep · 6 km away
11. 2.772 km ESE of West Yellowstone, MontanaSun, Oct 21, 3:07 PM MDT · 2905 days ago · 10 km deep · 69 km away · felt by 1
12. 2.123 km SW of Mammoth, WyomingMon, Oct 22, 4:20 PM MDT · 2904 days ago · 5 km deep · 0 km away
13. 1.646 km SE of West Yellowstone, MontanaWed, Oct 24, 4:56 PM MDT · 2902 days ago · 3 km deep · 51 km away
14. 2.026 km ESE of West Yellowstone, MontanaTue, Oct 30, 6:35 PM MDT · 2896 days ago · 9 km deep · 25 km away
15. 1.97 km ENE of Hebgen Lake Estates, MontanaSun, Nov 4, 8:54 AM MST · 2891 days ago · 12 km deep · 18 km away
16. 1.58 km ENE of Hebgen Lake Estates, MontanaSun, Nov 4, 9:07 AM MST · 2891 days ago · 10 km deep · 17 km away
17. 1.88 km ENE of Hebgen Lake Estates, MontanaSun, Nov 4, 9:13 AM MST · 2891 days ago · 9 km deep · 16 km away
18. 1.67 km ENE of Hebgen Lake Estates, MontanaSun, Nov 4, 9:14 AM MST · 2891 days ago · 9 km deep · 17 km away
19. 1.78 km ENE of Hebgen Lake Estates, MontanaSun, Nov 4, 9:46 AM MST · 2891 days ago · 10 km deep · 17 km away
20. 2.08 km ENE of Hebgen Lake Estates, MontanaSun, Nov 4, 9:46 AM MST · 2891 days ago · 10 km deep · 17 km away
21. 1.87 km ENE of Hebgen Lake Estates, MontanaSun, Nov 4, 9:58 AM MST · 2891 days ago · 11 km deep · 18 km away
22. 2.47 km ENE of Hebgen Lake Estates, MontanaSun, Nov 4, 10:11 AM MST · 2891 days ago · 11 km deep · 18 km away
23. 1.63 km ENE of Hebgen Lake Estates, MontanaThu, Nov 8, 2:47 AM MST · 2887 days ago · 11 km deep · 22 km away
24. 1.847 km SE of Mammoth, WyomingThu, Nov 8, 11:12 PM MST · 2887 days ago · 2 km deep · 45 km away
25. 1.611 km NNE of West Yellowstone, MontanaMon, Nov 12, 3:25 AM MST · 2883 days ago · 7 km deep · 13 km away
26. 1.83 km SSE of Hebgen Lake Estates, MontanaTue, Nov 20, 2:03 AM MST · 2875 days ago · 12 km deep · 24 km away
27. 1.622 km SSW of Mammoth, WyomingWed, Nov 21, 5:13 PM MST · 2874 days ago · 5 km deep · 7 km away
28. 2.124 km SSW of Mammoth, WyomingFri, Nov 23, 7:18 AM MST · 2872 days ago · 5 km deep · 8 km away
29. 2.325 km SSW of Mammoth, WyomingFri, Nov 23, 9:25 AM MST · 2872 days ago · 5 km deep · 9 km away
30. 1.924 km SSW of Mammoth, WyomingFri, Nov 23, 9:31 AM MST · 2872 days ago · 5 km deep · 9 km away
31. 1.623 km SSW of Mammoth, WyomingFri, Nov 23, 8:12 PM MST · 2872 days ago · 4 km deep · 8 km away
32. 1.648 km ESE of West Yellowstone, MontanaTue, Nov 27, 4:47 AM MST · 2868 days ago · 2 km deep · 45 km away

Before

1. 2.713 km NE of West Yellowstone, MontanaThu, Oct 4, 2:47 AM MDT · 2922 days ago · 10 km deep · 11 km away
2. 1.734 km S of Silver Gate, MontanaSat, Sep 29, 12:47 PM MDT · 2927 days ago · 17 km deep · 71 km away
3. 1.910 km ESE of Bozeman, MontanaThu, Sep 27, 1:20 PM MDT · 2929 days ago · 4 km deep · 93 km away
4. 1.647 km ENE of Warm River, IdahoTue, Sep 25, 11:26 AM MDT · 2931 days ago · 11 km deep · 63 km away
5. 1.754 km SE of West Yellowstone, MontanaWed, Sep 19, 8:44 AM MDT · 2937 days ago · 6 km deep · 56 km away
6. 1.714 km S of West Yellowstone, MontanaSun, Sep 16, 1:51 PM MDT · 2940 days ago · 13 km deep · 35 km away
7. 2.035 km ESE of Island Park, IdahoThu, Sep 13, 7:59 AM MDT · 2943 days ago · 4 km deep · 51 km away
8. 2.925 km ESE of Mammoth, WyomingTue, Sep 11, 7:30 AM MDT · 2945 days ago · 11 km deep · 36 km away
9. 1.944 km W of Hebgen Lake Estates, MontanaMon, Sep 10, 3:08 AM MDT · 2946 days ago · 10 km deep · 69 km away
10. 1.640 km S of Silver Gate, MontanaFri, Sep 7, 2:43 PM MDT · 2949 days ago · 10 km deep · 68 km away
11. 1.639 km S of Silver Gate, MontanaFri, Sep 7, 6:50 AM MDT · 2949 days ago · 13 km deep · 70 km away

From the USGS Earthquake Hazards Program and its partner networks, event uu60299842. Read Sun, Oct 4, 2026, 7:54 PM UTC.