M1.8 earthquake 10 km SSE of Harrison, Montana

Magnitude

1.8 (ML, local (Richter)), micro

Magnitude from

Montana Bureau of Mines and Geology

Local time

Mon, Nov 20, 2017, 8:41 PM MST

UTC

2017-11-21 03:41:57 UTC

Depth

2.9 km (1.8 mi), shallow

Epicenter

45.605° N, 111.755° W

Region

Montana

Tsunami flag

No

Status

Reviewed by a seismologist

Location uncertainty

About 0.3 km horizontally, 0.8 km in depth

Magnitude uncertainty

±0.12

Depth from

From location

Station coverage gap

62°

Stations used

24

• Ennis, MontanaPopulation 884. Forecast29 kmN
• Bozeman, MontanaPopulation 43,405. Forecast56 kmW
• Billings, MontanaPopulation 117,116. Forecast253 kmW
• Calgary, CanadaPopulation 1,306,784. Forecast629 kmSSE

After

1. 2.019 km W of Hebgen Lake Estates, MontanaSun, Nov 26, 1:32 PM MST · 3232 days ago · 14 km deep · 96 km away
2. 2.614 km S of Whitehall, MontanaWed, Dec 6, 9:22 AM MST · 3223 days ago · 12 km deep · 32 km away
3. 1.612 km NNE of Toston, MontanaThu, Dec 7, 7:58 AM MST · 3222 days ago · 5 km deep · 80 km away
4. 2.27 km NNW of Toston, MontanaSat, Dec 9, 9:33 PM MST · 3219 days ago · 6 km deep · 72 km away
5. 1.716 km S of Whitehall, MontanaWed, Dec 13, 10:25 AM MST · 3216 days ago · 4 km deep · 32 km away
6. 2.117 km S of Whitehall, MontanaWed, Dec 13, 2:21 PM MST · 3215 days ago · 2 km deep · 31 km away
7. 1.717 km WNW of Twin Bridges, MontanaFri, Dec 15, 8:33 PM MST · 3213 days ago · 5 km deep · 61 km away
8. 1.911 km WSW of Townsend, MTSat, Dec 16, 10:43 PM MST · 3212 days ago · 6 km deep · 87 km away
9. 2.918 km SSW of Whitehall, MontanaMon, Dec 18, 7:52 AM MST · 3211 days ago · 5 km deep · 35 km away
10. 2.417 km SSW of Whitehall, MontanaSun, Dec 24, 6:52 PM MST · 3204 days ago · 5 km deep · 36 km away
11. 2.316 km S of Whitehall, MontanaFri, Dec 29, 4:54 AM MST · 3200 days ago · 4 km deep · 32 km away · felt by 1
12. 2.018 km N of Dillon, MontanaMon, Jan 1, 5:26 PM MST · 3196 days ago · 6 km deep · 70 km away
13. 1.58 km NW of Ennis, MontanaTue, Jan 2, 7:15 AM MST · 3196 days ago · 3 km deep · 23 km away
14. 2.237 km SSE of Virginia City, MontanaSat, Jan 13, 5:17 AM MST · 3185 days ago · 5 km deep · 69 km away
15. 1.834 km SSE of Virginia City, MontanaSat, Jan 13, 7:01 AM MST · 3185 days ago · 7 km deep · 67 km away

Before

1. 2.82 km W of Gallatin Gateway, MontanaMon, Nov 6, 2:13 AM MST · 3253 days ago · 9 km deep · 41 km away · felt by 13
2. 2.113 km N of Dillon, MontanaThu, Nov 2, 9:29 AM MDT · 3257 days ago · 3 km deep · 73 km away
3. 1.913 km N of Dillon, MontanaThu, Nov 2, 7:47 AM MDT · 3257 days ago · 4 km deep · 73 km away
4. 1.77 km NW of Twin Bridges, MontanaTue, Oct 24, 8:55 PM MDT · 3265 days ago · 5 km deep · 51 km away
5. 1.78 km NNW of Twin Bridges, MontanaSun, Oct 22, 5:50 AM MDT · 3268 days ago · 2 km deep · 49 km away

From the USGS Earthquake Hazards Program and its partner networks, event mb80270559. Read Sat, Oct 3, 2026, 5:48 AM UTC.