Earthquake Risk in Montana
Montana has moderate seismic activity, particularly in the western part of the state. The Intermountain Seismic Belt passes through the region, and the 1959 Hebgen Lake earthquake (M7.3) was one of the largest in the northern Rocky Mountains.
Notable Earthquakes
50
Recorded in or near Montana (since 2004)
Largest Earthquake
M6.5
Stanley, Idaho (Mar 2020)
Most Recent
M3.9
Feb 29, 2020
Notable Earthquakes
Significant earthquakes recorded in or near this state.
| Magnitude | Location | Depth | Date |
|---|---|---|---|
| M6.5 | Stanley, Idaho | 12.1 km | Mar 31, 2020 |
| M5.8 | 11 km SE of Lincoln, Montana | 12.2 km | Jul 6, 2017 |
| M5.6 | 16 km N of Dillon, Montana | 12.9 km | Jul 26, 2005 |
| M5.0 | 15 km S of Lincoln, Montana | 14.7 km | Jul 6, 2017 |
| M5.0 | 9 km E of Challis, Idaho | 8.5 km | Jan 3, 2015 |
| M4.8 | 22 km S of Mammoth, Wyoming | 5.6 km | Mar 30, 2014 |
| M4.8 | 15 km NNW of Challis, Idaho | 3.5 km | Apr 13, 2014 |
| M4.6 | 9 km NE of Lima, Montana | 14.4 km | Apr 9, 2019 |
| M4.5 | 21 km N of Leadore, Idaho | 5.0 km | Oct 31, 2005 |
| M4.4 | 44 km NE of Spencer, Idaho | 14.0 km | Feb 5, 2006 |
| M4.4 | 39 km NNW of Stanley, Idaho | 10.0 km | Sep 8, 2020 |
| M4.4 | 31 km NW of Stanley, Idaho | 12.8 km | May 14, 2020 |
| M4.4 | 14 km SE of Lincoln, Montana | 9.7 km | Jul 6, 2017 |
| M4.4 | 8 km NNW of Alder, Montana | 13.5 km | May 8, 2007 |
| M4.4 | 28 km NNE of Spencer, Idaho | 12.1 km | Apr 5, 2011 |
| M4.4 | 13 km NW of Challis, Idaho | 7.4 km | Apr 14, 2014 |
| M4.4 | 12 km E of Hebgen Lake Estates, Montana | 9.3 km | Jun 16, 2017 |
| M4.3 | 45 km W of Hebgen Lake Estates, Montana | 9.9 km | Jun 13, 2016 |
| M4.3 | 19 km E of Lincoln, Montana | 1.6 km | Jan 30, 2016 |
| M4.3 | 8 km SSW of Rexford, Montana | 8.2 km | Mar 22, 2006 |
| M4.2 | 36 km S of Silver Gate, Montana | 13.9 km | May 11, 2022 |
| M4.2 | 9 km N of Black Eagle, Montana | 23.5 km | Jan 29, 2026 |
| M4.2 | 26 km NW of Clayton, Idaho | 9.2 km | Jan 27, 2025 |
| M4.2 | 3 km S of Lima, Montana | 11.6 km | Jul 14, 2023 |
| M4.2 | 4 km NW of Manhattan, Montana | 2.4 km | Aug 16, 2019 |
| M4.2 | 15 km E of Alzada, Montana | 4.5 km | Sep 25, 2009 |
| M4.2 | 35 km S of Silver Gate, Montana | 3.9 km | Mar 25, 2008 |
| M4.1 | 11 km E of Dillon, Montana | 17.0 km | Oct 7, 2024 |
| M4.1 | 12 km SSW of Grass Range, Montana | 1.8 km | Nov 26, 2007 |
| M4.1 | 6 km S of Pony, Montana | 11.5 km | Jun 18, 2006 |
| M4.1 | 29 km NW of Stanley, Idaho | 10.0 km | Apr 21, 2020 |
| M4.1 | 3 km NW of Manhattan, Montana | 5.0 km | Aug 6, 2019 |
| M4.1 | 21 km SE of Stites, Idaho | 12.9 km | Nov 20, 2018 |
| M4.0 | 16 km S of Whitehall, Montana | 8.0 km | Sep 3, 2016 |
| M4.0 | 20 km SSE of Birney, Montana | 13.9 km | Aug 22, 2009 |
| M4.0 | 18 km N of Dillon, Montana | 5.0 km | Jul 27, 2005 |
| M4.0 | 18 km NNE of Dillon, Montana | 8.7 km | Jan 18, 2006 |
| M4.0 | 39 km NNW of Stanley, Idaho | 10.0 km | Sep 8, 2020 |
| M4.0 | 11 km NNE of Manhattan, Montana | 6.3 km | Jul 14, 2019 |
| M4.0 | 12 km ESE of Lincoln, Montana | 12.6 km | Jul 17, 2017 |
| M4.0 | 14 km SSE of Lincoln, Montana | 9.1 km | Jul 6, 2017 |
| M4.0 | 11 km NW of Challis, Idaho | 7.2 km | Apr 10, 2014 |
| M4.0 | 18 km S of Whitehall, Montana | 11.7 km | Mar 6, 2009 |
| M4.0 | 45 km W of Hebgen Lake Estates, Montana | 9.7 km | Jun 14, 2016 |
| M3.9 | 22 km SSW of Mammoth, Wyoming | 10.8 km | Sep 18, 2022 |
| M3.9 | 21 km N of Spencer, Idaho | 11.5 km | Sep 8, 2025 |
| M3.9 | 5 km SSW of Pony, Montana | 11.0 km | Jun 21, 2006 |
| M3.9 | 15 km SE of Challis, Idaho | 5.0 km | Nov 21, 2004 |
| M3.9 | 35 km NNW of Stanley, Idaho | 10.0 km | Apr 12, 2020 |
| M3.9 | 28 km W of Hebgen Lake Estates, Montana | 11.9 km | Feb 29, 2020 |
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