M1.8 earthquake 1 km NE of Boulder, Montana

Magnitude

1.8 (ML, local (Richter)), micro

Magnitude from

Montana Bureau of Mines and Geology

Local time

Fri, Aug 31, 2018, 11:12 PM MDT

UTC

2018-09-01 05:12:23 UTC

Depth

7.3 km (4.5 mi), shallow

Epicenter

46.248° N, 112.109° W

Region

Montana

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.3 km horizontally, 0.9 km in depth

Magnitude uncertainty

±0.17

Depth from

From location

Station coverage gap

57°

Stations used

25

• Boulder, MontanaPopulation 1,207. Forecast2 kmNE
• Helena, MontanaPopulation 32,091. Forecast39 kmS
• Billings, MontanaPopulation 117,116. Forecast283 kmWNW
• Calgary, CanadaPopulation 1,306,784. Forecast553 kmSSE

After

1. 1.510 km ESE of Lincoln, MontanaSat, Sep 1, 6:20 AM MDT · 2954 days ago · 12 km deep · 81 km away
2. 2.37 km W of Willow Creek, MontanaSat, Sep 1, 4:08 PM MDT · 2954 days ago · 5 km deep · 54 km away
3. 2.26 km W of Willow Creek, MontanaSun, Sep 2, 5:09 PM MDT · 2953 days ago · 3 km deep · 55 km away
4. 2.213 km SE of Lincoln, MontanaTue, Sep 4, 9:56 AM MDT · 2951 days ago · 10 km deep · 78 km away
5. 1.717 km S of Whitehall, MontanaWed, Sep 5, 12:20 AM MDT · 2951 days ago · 6 km deep · 59 km away
6. 1.933 km WNW of Twin Bridges, MontanaSat, Sep 8, 7:21 AM MDT · 2947 days ago · 1 km deep · 86 km away
7. 1.814 km SE of Lincoln, MontanaSun, Sep 9, 8:49 AM MDT · 2946 days ago · 15 km deep · 76 km away
8. 2.214 km ESE of Lincoln, MontanaMon, Sep 10, 6:41 AM MDT · 2945 days ago · 16 km deep · 77 km away
9. 1.814 km SE of Lincoln, MontanaFri, Sep 14, 1:54 AM MDT · 2942 days ago · 15 km deep · 76 km away
10. 1.714 km SE of Lincoln, MontanaWed, Sep 19, 1:59 AM MDT · 2937 days ago · 13 km deep · 77 km away
11. 1.714 km ESE of Lincoln, MontanaThu, Sep 20, 11:08 AM MDT · 2935 days ago · 16 km deep · 78 km away
12. 1.74 km WSW of Three Forks, MontanaFri, Sep 21, 9:17 AM MDT · 2934 days ago · 3 km deep · 56 km away
13. 2.012 km ESE of Lincoln, MontanaSat, Sep 22, 7:42 PM MDT · 2933 days ago · 13 km deep · 79 km away
14. 2.716 km ESE of Lincoln, MontanaSun, Sep 23, 9:50 PM MDT · 2932 days ago · 11 km deep · 77 km away · felt by 1
15. 1.516 km E of Lincoln, MontanaTue, Sep 25, 6:34 AM MDT · 2930 days ago · 9 km deep · 83 km away
16. 1.714 km SE of Lincoln, MontanaTue, Sep 25, 7:18 PM MDT · 2930 days ago · 13 km deep · 77 km away
17. 1.913 km ESE of Lincoln, MontanaThu, Sep 27, 2:13 AM MDT · 2929 days ago · 12 km deep · 79 km away
18. 2.09 km WNW of Lincoln, MontanaThu, Sep 27, 11:35 AM MDT · 2928 days ago · 15 km deep · 97 km away
19. 2.01 km W of Manhattan, MontanaSun, Sep 30, 6:06 AM MDT · 2926 days ago · 5 km deep · 73 km away
20. 1.514 km ESE of Lincoln, MontanaFri, Oct 5, 10:32 AM MDT · 2920 days ago · 12 km deep · 78 km away · felt by 1
21. 2.016 km S of Whitehall, MontanaMon, Oct 8, 3:21 PM MDT · 2917 days ago · 3 km deep · 59 km away
22. 2.83 km WNW of Manhattan, MontanaWed, Oct 10, 5:53 AM MDT · 2916 days ago · 5 km deep · 71 km away · felt by 14
23. 1.92 km W of Manhattan, MontanaWed, Oct 10, 6:31 AM MDT · 2915 days ago · 4 km deep · 72 km away · felt by 1
24. 1.51 km WNW of Manhattan, MontanaThu, Oct 11, 6:34 AM MDT · 2914 days ago · 2 km deep · 72 km away
25. 1.614 km SE of Lincoln, MontanaFri, Oct 12, 9:33 AM MDT · 2913 days ago · 12 km deep · 76 km away
26. 2.22 km WNW of Manhattan, MontanaSat, Oct 13, 11:52 AM MDT · 2912 days ago · 5 km deep · 72 km away
27. 1.52 km WNW of Manhattan, MontanaSat, Oct 13, 2:42 PM MDT · 2912 days ago · 4 km deep · 72 km away
28. 2.311 km S of Craig, MontanaMon, Oct 15, 2:50 PM MDT · 2910 days ago · 3 km deep · 81 km away
29. 1.811 km S of Craig, MontanaMon, Oct 15, 5:33 PM MDT · 2910 days ago · 1 km deep · 81 km away
30. 2.20 km E of Manhattan, MontanaTue, Oct 16, 6:49 AM MDT · 2909 days ago · 5 km deep · 74 km away · felt by 1
31. 3.33 km WSW of Manhattan, MontanaTue, Oct 16, 10:46 AM MDT · 2909 days ago · 5 km deep · 72 km away · felt by 18
32. 2.54 km NW of Manhattan, MontanaTue, Oct 16, 7:03 PM MDT · 2909 days ago · 5 km deep · 70 km away · felt by 1
33. 1.713 km ESE of Lincoln, MontanaWed, Oct 17, 10:37 PM MDT · 2908 days ago · 15 km deep · 79 km away
34. 1.814 km SE of Lincoln, MontanaThu, Oct 18, 9:54 PM MDT · 2907 days ago · 13 km deep · 77 km away
35. 2.416 km SE of Lincoln, MontanaSat, Oct 20, 3:01 AM MDT · 2906 days ago · 12 km deep · 74 km away
36. 1.62 km WNW of Manhattan, MontanaTue, Oct 23, 6:06 PM MDT · 2902 days ago · 4 km deep · 72 km away
37. 2.85 km SSE of Logan, MontanaThu, Oct 25, 7:10 PM MDT · 2900 days ago · 8 km deep · 71 km away · felt by 3
38. 1.52 km WNW of Manhattan, MontanaThu, Oct 25, 10:16 PM MDT · 2900 days ago · 4 km deep · 72 km away
39. 1.51 km WNW of Manhattan, MontanaFri, Oct 26, 12:30 AM MDT · 2900 days ago · 6 km deep · 73 km away
40. 1.6Western MontanaFri, Oct 26, 10:25 AM MDT · 2899 days ago · 4 km deep · 73 km away
41. 1.610 km NW of Helena Valley Northwest, MontanaFri, Oct 26, 10:53 PM MDT · 2899 days ago · 2 km deep · 61 km away
42. 2.31 km NW of Manhattan, MontanaSat, Oct 27, 7:53 AM MDT · 2898 days ago · 5 km deep · 73 km away
43. 1.72 km WNW of Manhattan, MontanaMon, Oct 29, 2:59 AM MDT · 2897 days ago · 0 km deep · 72 km away
44. 1.82 km WNW of Manhattan, MontanaMon, Oct 29, 6:22 AM MDT · 2896 days ago · 4 km deep · 72 km away
45. 1.61 km W of Manhattan, MontanaMon, Oct 29, 9:11 AM MDT · 2896 days ago · 8 km deep · 73 km away

Before

1. 2.46 km W of Willow Creek, MontanaThu, Aug 30, 11:14 PM MDT · 2956 days ago · 3 km deep · 55 km away
2. 1.611 km ESE of Lincoln, MontanaThu, Aug 30, 12:48 AM MDT · 2957 days ago · 13 km deep · 81 km away
3. 1.811 km ESE of Lincoln, MontanaThu, Aug 30, 12:43 AM MDT · 2957 days ago · 13 km deep · 81 km away
4. 2.410 km ESE of Lincoln, MontanaMon, Aug 27, 5:38 PM MDT · 2959 days ago · 12 km deep · 81 km away
5. 1.610 km ESE of Lincoln, MontanaMon, Aug 27, 5:11 AM MDT · 2960 days ago · 13 km deep · 81 km away
6. 1.611 km ESE of Lincoln, MontanaMon, Aug 27, 2:11 AM MDT · 2960 days ago · 12 km deep · 80 km away
7. 1.510 km ESE of Lincoln, MontanaSun, Aug 26, 10:10 PM MDT · 2960 days ago · 13 km deep · 81 km away
8. 2.126 km ENE of Wisdom, MontanaSat, Aug 25, 11:50 PM MDT · 2961 days ago · 3 km deep · 99 km away
9. 1.915 km SE of Lincoln, MontanaSat, Aug 25, 5:11 PM MDT · 2961 days ago · 13 km deep · 76 km away
10. 1.715 km SE of Lincoln, MontanaTue, Aug 21, 2:35 PM MDT · 2965 days ago · 13 km deep · 76 km away
11. 1.713 km ESE of Lincoln, MontanaMon, Aug 20, 8:06 PM MDT · 2966 days ago · 15 km deep · 79 km away
12. 1.513 km ESE of Lincoln, MontanaMon, Aug 20, 6:22 AM MDT · 2966 days ago · 14 km deep · 79 km away
13. 2.013 km ESE of Lincoln, MontanaThu, Aug 16, 8:43 PM MDT · 2970 days ago · 14 km deep · 79 km away
14. 2.415 km SE of Lincoln, MontanaThu, Aug 16, 2:58 PM MDT · 2970 days ago · 12 km deep · 76 km away
15. 1.715 km SE of Lincoln, MontanaMon, Aug 13, 10:54 PM MDT · 2973 days ago · 14 km deep · 76 km away
16. 2.616 km SE of Lincoln, MontanaSat, Aug 11, 10:53 PM MDT · 2975 days ago · 15 km deep · 75 km away · felt by 1
17. 1.96 km NE of Logan, MontanaFri, Aug 10, 3:05 PM MDT · 2976 days ago · 3 km deep · 67 km away
18. 2.47 km NNE of Drummond, MontanaFri, Aug 10, 8:21 AM MDT · 2976 days ago · 8 km deep · 93 km away
19. 1.614 km SSE of Craig, MontanaThu, Aug 9, 1:21 AM MDT · 2978 days ago · 9 km deep · 80 km away
20. 1.54 km SSE of Lincoln, MontanaThu, Aug 2, 2:28 PM MDT · 2984 days ago · 19 km deep · 86 km away

From the USGS Earthquake Hazards Program and its partner networks, event mb80308149. Read Sat, Oct 3, 2026, 11:37 PM UTC.