M1.6 earthquake 27 km SE of Challis, Idaho

Magnitude

1.6 (ML, local (Richter)), micro

Magnitude from

Montana Bureau of Mines and Geology

Local time

Fri, Dec 18, 2015, 4:32 PM MST

UTC

2015-12-18 23:32:11 UTC

Depth

1.1 km (0.7 mi), shallow

Epicenter

44.346° N, 113.969° W

Region

Idaho

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.5 km horizontally, 1.3 km in depth

Magnitude uncertainty

±0.17

Depth from

From location

Station coverage gap

111°

Stations used

7

• Challis, IdahoPopulation 1,043. Forecast27 kmSE
• Blackfoot, IdahoPopulation 11,740. Forecast183 kmNW
• Boise, IdahoPopulation 235,684. Forecast196 kmENE
• Calgary, CanadaPopulation 1,306,784. Forecast745 kmS

After

1. 1.625 km SE of Challis, IdahoSat, Dec 19, 4:03 AM MST · 3940 days ago · 5 km deep · 2 km away
2. 2.025 km SE of Challis, IdahoSun, Dec 20, 4:54 PM MST · 3938 days ago · 5 km deep · 2 km away
3. 1.512 km SE of Challis, IdahoFri, Dec 25, 4:11 PM MST · 3933 days ago · 5 km deep · 15 km away
4. 2.16 km NNW of Challis, IdahoSat, Dec 26, 4:45 PM MST · 3932 days ago · 7 km deep · 33 km away
5. 2.46 km NNW of Challis, IdahoSat, Dec 26, 5:13 PM MST · 3932 days ago · 6 km deep · 33 km away
6. 2.16 km NNW of Challis, IdahoSat, Dec 26, 6:01 PM MST · 3932 days ago · 10 km deep · 34 km away
7. 1.95 km NNW of Challis, IdahoSat, Dec 26, 6:06 PM MST · 3932 days ago · 8 km deep · 33 km away
8. 1.86 km NNW of Challis, IdahoSat, Dec 26, 6:42 PM MST · 3932 days ago · 10 km deep · 33 km away
9. 1.818 km ENE of Hailey, IdahoSat, Dec 26, 10:34 PM MST · 3932 days ago · 3 km deep · 83 km away
10. 1.613 km SE of Challis, IdahoSun, Dec 27, 11:28 AM MST · 3931 days ago · 11 km deep · 14 km away
11. 2.36 km SE of Salmon, IdahoTue, Dec 29, 3:43 PM MST · 3929 days ago · 13 km deep · 89 km away
12. 1.65 km NW of Challis, IdahoThu, Dec 31, 1:41 PM MST · 3927 days ago · 0 km deep · 32 km away
13. 1.55 km NNW of Challis, IdahoThu, Dec 31, 2:18 PM MST · 3927 days ago · 8 km deep · 33 km away
14. 1.64 km NNW of Challis, IdahoSat, Jan 2, 12:32 AM MST · 3926 days ago · 5 km deep · 31 km away
15. 1.86 km NNW of Challis, IdahoSat, Jan 2, 2:17 AM MST · 3926 days ago · 7 km deep · 33 km away
16. 1.64 km NNW of Challis, IdahoTue, Jan 12, 12:54 AM MST · 3916 days ago · 5 km deep · 32 km away
17. 2.430 km E of Leadore, IdahoWed, Jan 13, 11:33 AM MST · 3914 days ago · 4 km deep · 88 km away
18. 1.629 km WNW of Lima, MontanaThu, Jan 14, 8:53 AM MST · 3914 days ago · 4 km deep · 89 km away
19. 2.313 km SE of Challis, IdahoMon, Jan 18, 7:28 PM MST · 3909 days ago · 7 km deep · 14 km away
20. 3.810 km SE of Challis, IdahoMon, Jan 18, 11:29 PM MST · 3909 days ago · 8 km deep · 17 km away · felt by 8
21. 1.614 km W of Challis, IdahoThu, Jan 21, 12:11 AM MST · 3907 days ago · 9 km deep · 40 km away
22. 1.5Idaho-Montana border regionFri, Jan 22, 4:23 PM MST · 3905 days ago · 10 km deep · 98 km away
23. 1.923 km WNW of Challis, IdahoFri, Jan 22, 4:32 PM MST · 3905 days ago · 1 km deep · 49 km away
24. 2.123 km WNW of Challis, IdahoFri, Jan 22, 4:37 PM MST · 3905 days ago · 4 km deep · 49 km away
25. 2.2southern IdahoFri, Jan 22, 6:57 PM MST · 3905 days ago · 6 km deep · 49 km away
26. 1.723 km WNW of Challis, IdahoFri, Jan 22, 11:32 PM MST · 3905 days ago · 1 km deep · 49 km away
27. 2.823 km WNW of Challis, IdahoSat, Jan 23, 12:56 AM MST · 3905 days ago · 6 km deep · 49 km away
28. 1.822 km WNW of Challis, IdahoSat, Jan 23, 7:04 AM MST · 3905 days ago · 6 km deep · 48 km away
29. 1.523 km SE of Challis, IdahoSat, Jan 23, 10:24 PM MST · 3904 days ago · 1 km deep · 5 km away
30. 2.122 km WNW of Challis, IdahoSun, Jan 24, 2:25 AM MST · 3904 days ago · 6 km deep · 49 km away
31. 1.723 km WNW of Challis, IdahoSun, Jan 24, 11:17 AM MST · 3903 days ago · 5 km deep · 49 km away
32. 1.822 km WNW of Challis, IdahoTue, Jan 26, 9:59 AM MST · 3902 days ago · 7 km deep · 49 km away
33. 1.619 km W of Challis, IdahoTue, Jan 26, 8:07 PM MST · 3901 days ago · 7 km deep · 45 km away
34. 1.820 km W of Challis, IdahoTue, Jan 26, 8:07 PM MST · 3901 days ago · 6 km deep · 46 km away
35. 1.79 km ESE of Challis, IdahoWed, Jan 27, 12:19 AM MST · 3901 days ago · 5 km deep · 17 km away
36. 1.711 km NE of Challis, IdahoThu, Jan 28, 11:27 PM MST · 3899 days ago · 5 km deep · 28 km away
37. 1.611 km ENE of Challis, IdahoFri, Jan 29, 1:06 AM MST · 3899 days ago · 5 km deep · 26 km away
38. 1.612 km NE of Challis, IdahoFri, Jan 29, 2:58 AM MST · 3899 days ago · 3 km deep · 29 km away
39. 2.013 km NE of Challis, IdahoFri, Jan 29, 10:27 PM MST · 3898 days ago · 5 km deep · 30 km away
40. 1.614 km SE of Challis, IdahoSat, Jan 30, 1:06 PM MST · 3897 days ago · 5 km deep · 12 km away
41. 1.822 km SE of Challis, IdahoSat, Jan 30, 6:18 PM MST · 3897 days ago · 1 km deep · 7 km away
42. 1.7southern IdahoSun, Jan 31, 3:49 AM MST · 3897 days ago · 1 km deep · 6 km away
43. 1.64 km NNW of Challis, IdahoSun, Jan 31, 11:43 AM MST · 3896 days ago · 5 km deep · 31 km away
44. 3.136 km SW of Lima, MontanaSun, Jan 31, 1:00 PM MST · 3896 days ago · 5 km deep · 84 km away
45. 1.6Idaho-Montana border regionSun, Jan 31, 2:12 PM MST · 3896 days ago · 8 km deep · 83 km away
46. 2.32 km NNW of Challis, IdahoSun, Jan 31, 6:38 PM MST · 3896 days ago · 8 km deep · 30 km away
47. 1.819 km SE of Challis, IdahoTue, Feb 2, 12:17 PM MST · 3894 days ago · 2 km deep · 8 km away
48. 1.622 km WNW of Challis, IdahoTue, Feb 2, 2:27 PM MST · 3894 days ago · 5 km deep · 49 km away
49. 1.822 km WNW of Challis, IdahoTue, Feb 2, 2:30 PM MST · 3894 days ago · 6 km deep · 49 km away
50. 2.315 km W of Clayton, IdahoMon, Feb 8, 4:23 AM MST · 3889 days ago · 8 km deep · 51 km away
51. 1.813 km SE of Challis, IdahoMon, Feb 8, 6:41 PM MST · 3888 days ago · 7 km deep · 14 km away
52. 2.212 km SE of Challis, IdahoTue, Feb 9, 11:46 AM MST · 3887 days ago · 8 km deep · 15 km away
53. 1.512 km SE of Challis, IdahoFri, Feb 12, 9:30 PM MST · 3884 days ago · 6 km deep · 15 km away
54. 1.920 km SE of Challis, IdahoSun, Feb 14, 3:31 AM MST · 3883 days ago · 3 km deep · 8 km away
55. 1.810 km NW of Challis, IdahoSun, Feb 14, 10:13 AM MST · 3883 days ago · -1 km deep · 38 km away
56. 1.512 km SE of Challis, IdahoSun, Feb 14, 11:08 PM MST · 3882 days ago · 6 km deep · 15 km away
57. 1.914 km SE of Challis, IdahoTue, Feb 16, 12:45 PM MST · 3880 days ago · 7 km deep · 13 km away

Before

1. 1.816 km SE of Challis, IdahoFri, Dec 18, 11:43 AM MST · 3940 days ago · 5 km deep · 11 km away
2. 1.525 km SE of Challis, IdahoThu, Dec 17, 1:55 PM MST · 3941 days ago · 5 km deep · 2 km away
3. 2.328 km SE of Challis, IdahoThu, Dec 17, 8:25 AM MST · 3942 days ago · 12 km deep · 1 km away
4. 1.725 km SE of Challis, IdahoThu, Dec 17, 5:15 AM MST · 3942 days ago · 5 km deep · 2 km away
5. 2.110 km SE of Challis, IdahoMon, Dec 14, 5:10 PM MST · 3944 days ago · 5 km deep · 17 km away
6. 1.78 km NNW of Challis, IdahoSun, Dec 13, 10:18 AM MST · 3946 days ago · 5 km deep · 35 km away
7. 1.68 km SE of Challis, IdahoSun, Dec 13, 7:17 AM MST · 3946 days ago · 0 km deep · 19 km away
8. 2.06 km NNW of Challis, IdahoSat, Dec 12, 6:47 AM MST · 3947 days ago · 9 km deep · 33 km away
9. 1.75 km NNW of Challis, IdahoFri, Dec 11, 9:53 PM MST · 3947 days ago · 5 km deep · 32 km away
10. 1.58 km NW of Challis, IdahoFri, Dec 11, 7:52 PM MST · 3947 days ago · 4 km deep · 36 km away
11. 1.85 km NNW of Challis, IdahoFri, Dec 11, 3:40 PM MST · 3947 days ago · 9 km deep · 32 km away
12. 1.75 km NNW of Challis, IdahoFri, Dec 11, 9:15 AM MST · 3948 days ago · 9 km deep · 32 km away
13. 2.25 km NNW of Challis, IdahoFri, Dec 11, 7:12 AM MST · 3948 days ago · 8 km deep · 33 km away
14. 2.46 km NNW of Challis, IdahoFri, Dec 11, 3:53 AM MST · 3948 days ago · 8 km deep · 33 km away
15. 2.66 km NNW of Challis, IdahoFri, Dec 11, 1:15 AM MST · 3948 days ago · 8 km deep · 33 km away
16. 1.65 km NW of Challis, IdahoFri, Dec 11, 12:03 AM MST · 3948 days ago · 6 km deep · 33 km away
17. 2.0southern IdahoThu, Dec 10, 11:31 PM MST · 3948 days ago · 7 km deep · 33 km away
18. 1.74 km NNW of Challis, IdahoThu, Dec 10, 11:13 PM MST · 3948 days ago · 5 km deep · 31 km away
19. 2.25 km NNW of Challis, IdahoThu, Dec 10, 10:35 PM MST · 3948 days ago · 7 km deep · 32 km away
20. 2.28 km NNW of Challis, IdahoThu, Dec 10, 6:55 PM MST · 3948 days ago · 4 km deep · 35 km away

From the USGS Earthquake Hazards Program and its partner networks, event mb80116009. Read Fri, Oct 2, 2026, 5:21 AM UTC.