M1.6 earthquake 33 km W of Challis, Idaho

Magnitude

1.6 (ML, local (Richter)), micro

Magnitude from

Montana Bureau of Mines and Geology

Local time

Thu, Oct 18, 2018, 5:12 AM MDT

UTC

2018-10-18 11:12:46 UTC

Depth

2.4 km (1.5 mi), shallow

Epicenter

44.558° N, 114.644° W

Region

Idaho

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.7 km horizontally, 3.2 km in depth

Magnitude uncertainty

±0.21

Depth from

From location

Station coverage gap

120°

Stations used

7

• Challis, IdahoPopulation 1,043. Forecast33 kmW
• Boise, IdahoPopulation 235,684. Forecast163 kmNE
• Calgary, CanadaPopulation 1,306,784. Forecast723 kmS

After

1. 1.634 km NW of Mackay, IdahoSun, Oct 21, 10:41 AM MDT · 2905 days ago · 1 km deep · 74 km away
2. 2.320 km WNW of Mackay, IdahoFri, Oct 26, 11:41 AM MDT · 2900 days ago · 6 km deep · 90 km away · felt by 1
3. 1.65 km N of Stanley, IdahoThu, Nov 1, 7:46 AM MDT · 2894 days ago · 3 km deep · 40 km away
4. 1.76 km N of Stanley, IdahoThu, Nov 1, 7:50 AM MDT · 2894 days ago · 0 km deep · 40 km away
5. 2.19 km NNW of Stanley, IdahoSat, Nov 3, 2:19 AM MDT · 2892 days ago · 4 km deep · 38 km away
6. 2.26 km N of Stanley, IdahoSat, Nov 3, 6:38 AM MDT · 2892 days ago · 3 km deep · 40 km away
7. 1.72 km N of Challis, IdahoWed, Nov 14, 8:43 PM MST · 2880 days ago · 1 km deep · 33 km away
8. 2.125 km SSW of Clayton, IdahoSun, Nov 18, 8:53 AM MST · 2877 days ago · 5 km deep · 59 km away
9. 1.69 km NNW of Stanley, IdahoMon, Nov 19, 4:33 PM MST · 2876 days ago · 4 km deep · 38 km away
10. 3.115 km NNW of Stanley, IdahoTue, Nov 20, 12:11 AM MST · 2875 days ago · 5 km deep · 35 km away · felt by 1
11. 1.69 km NNW of Stanley, IdahoTue, Nov 20, 12:31 AM MST · 2875 days ago · 4 km deep · 38 km away
12. 2.88 km ESE of Challis, IdahoSun, Nov 25, 11:57 PM MST · 2869 days ago · 5 km deep · 42 km away · felt by 3
13. 1.625 km N of Lowman, IdahoSat, Dec 1, 2:02 AM MST · 2864 days ago · 7 km deep · 80 km away
14. 2.321 km SSE of Yellow Pine, IdahoSat, Dec 1, 9:07 PM MST · 2863 days ago · 16 km deep · 66 km away
15. 1.924 km N of Lowman, IdahoMon, Dec 3, 2:52 AM MST · 2862 days ago · 7 km deep · 80 km away
16. 2.59 km SSE of Clayton, IdahoWed, Dec 5, 5:08 AM MST · 2860 days ago · 5 km deep · 48 km away · felt by 1
17. 1.619 km NW of Clayton, IdahoSat, Dec 8, 3:48 AM MST · 2857 days ago · 3 km deep · 20 km away
18. 2.111 km NW of Challis, IdahoSun, Dec 9, 3:12 PM MST · 2856 days ago · 6 km deep · 25 km away
19. 1.624 km E of Clayton, IdahoTue, Dec 11, 9:05 AM MST · 2854 days ago · 6 km deep · 56 km away
20. 2.420 km SE of Challis, IdahoSat, Dec 15, 1:29 AM MST · 2850 days ago · 5 km deep · 51 km away

Before

1. 2.49 km N of Stanley, IdahoTue, Oct 9, 7:25 AM MDT · 2917 days ago · 3 km deep · 37 km away
2. 1.68 km N of Stanley, IdahoTue, Oct 9, 5:19 AM MDT · 2917 days ago · 6 km deep · 39 km away
3. 1.616 km SE of Challis, IdahoSat, Oct 6, 10:22 AM MDT · 2920 days ago · 4 km deep · 48 km away
4. 1.69 km N of Stanley, IdahoSat, Oct 6, 5:12 AM MDT · 2920 days ago · 4 km deep · 38 km away
5. 1.67 km NNW of Stanley, IdahoFri, Oct 5, 7:59 AM MDT · 2921 days ago · 4 km deep · 41 km away
6. 1.67 km NNW of Stanley, IdahoFri, Oct 5, 7:49 AM MDT · 2921 days ago · 5 km deep · 40 km away
7. 2.512 km NNE of Stanley, IdahoFri, Oct 5, 5:34 AM MDT · 2921 days ago · 5 km deep · 33 km away · felt by 1
8. 1.6southern IdahoFri, Oct 5, 5:31 AM MDT · 2921 days ago · 6 km deep · 40 km away
9. 1.89 km N of Stanley, IdahoFri, Oct 5, 5:24 AM MDT · 2921 days ago · 6 km deep · 38 km away
10. 2.43 km NW of Stanley, IdahoFri, Oct 5, 5:16 AM MDT · 2921 days ago · 5 km deep · 44 km away
11. 2.18 km N of Stanley, IdahoFri, Oct 5, 5:16 AM MDT · 2921 days ago · 4 km deep · 39 km away
12. 1.610 km SE of Challis, IdahoThu, Sep 27, 8:06 AM MDT · 2929 days ago · 7 km deep · 42 km away
13. 1.634 km SE of Stanley, IdahoSat, Sep 22, 3:14 AM MDT · 2934 days ago · 14 km deep · 66 km away

From the USGS Earthquake Hazards Program and its partner networks, event mb80314709. Read Sun, Oct 4, 2026, 12:30 PM UTC.