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Montana Earthquake History
Since May 16, 1909, the USGS has recorded 58 earthquakes of magnitude 4.5 or greater in Montana, 5 of them magnitude 6 or above. The strongest was M 7.2.
By decade
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Strongest in Montana
M 7.2 · The 1959 Hebgen Lake, Montana EarthquakeAugust 18, 1959M 6.6 · The 1925 Clarkston Valley, Montana EarthquakeJune 28, 1925M 6.4 · Clarkston Valley, Montana (Aftershock)June 28, 1925M 6.1 · 12 km N of Winston, MontanaOctober 19, 1935M 6.1 · 30 km SSW of Big Sky, MontanaNovember 23, 1947M 6.0 · 21 km E of West Yellowstone, MontanaAugust 19, 1959M 5.9 · 6 km E of Montana City, MontanaOctober 31, 1935M 5.9 · 2 km ENE of Helena, MontanaOctober 12, 1935M 5.8 · 11 km SE of Lincoln, MontanaJuly 6, 2017M 5.6 · 16 km N of Dillon, MontanaJuly 26, 2005
All recorded earthquakes
M 4.6 mwwApril 9, 2019
9 km NE of Lima, Montana · depth 14 km
M 5.0 mwwJuly 6, 2017
15 km S of Lincoln, Montana · depth 15 km
M 5.8 mwwJuly 6, 2017
11 km SE of Lincoln, Montana · depth 12 km
M 5.6 mwcJuly 26, 2005
16 km N of Dillon, Montana · depth 13 km
M 5.1 mbAugust 20, 1999
22 km NW of Lima, Montana · depth 16 km
M 4.8 mbApril 1, 1985
21 km ENE of Seeley Lake, Montana · depth 10 km
M 4.7 mbFebruary 6, 1983
37 km ESE of West Yellowstone, Montana · depth 5 km
M 4.6 mlOctober 26, 1982
44 km W of Hebgen Lake Estates, Montana · depth 5 km
M 4.5 mbFebruary 22, 1980
22 km NE of West Yellowstone, Montana · depth 1 km
M 4.6 mlMay 8, 1979
15 km W of Hebgen Lake Estates, Montana · depth 5 km
M 4.5 mbApril 23, 1978
12 km WSW of Ovando, Montana · depth 5 km
M 4.7 mlOctober 19, 1977
49 km W of Hebgen Lake Estates, Montana · depth 10 km
M 4.5 mbAugust 27, 1977
15 km NW of Three Forks, Montana · depth 10 km
M 5.2 mbMarch 11, 1977
26 km WNW of Hebgen Lake Estates, Montana · depth 5 km
M 4.6 mbMarch 11, 1977
6 km SSW of Toston, Montana · depth 5 km
M 5.3 mbOctober 19, 1976
24 km ENE of West Yellowstone, Montana · depth 4 km
M 4.6 mbFebruary 4, 1975
12 km E of Evergreen, Montana · depth 8 km
M 4.6 mbOctober 22, 1974
24 km ENE of West Yellowstone, Montana · depth 5 km
M 4.5 mbAugust 30, 1974
27 km E of West Yellowstone, Montana · depth 2 km
M 4.5 mbAugust 30, 1974
24 km E of West Yellowstone, Montana · depth 1 km
M 4.8 mbJuly 1, 1974
10 km S of West Yellowstone, Montana · depth 5 km
M 4.9 mlJune 9, 1974
11 km ENE of Hebgen Lake Estates, Montana · depth 5 km
M 5.1 mbMarch 31, 1973
51 km ESE of West Yellowstone, Montana · depth 10 km
M 4.6 mbMarch 30, 1973
68 km ESE of West Yellowstone, Montana · depth 11 km
M 4.5 mbMarch 28, 1973
64 km ESE of West Yellowstone, Montana · depth 10 km
M 5.0 mbMarch 28, 1973
62 km ESE of West Yellowstone, Montana · depth 8 km
M 4.5 mbApril 1, 1969
4 km NNE of Lake Mary Ronan, Montana · depth 15 km
M 4.7 mbApril 1, 1969
4 km NNW of Dayton, Montana · depth 10 km
M 4.8 mbMarch 7, 1966
2 km SE of Townsend, Montana · depth 13 km
M 4.9 mbOctober 8, 1965
8 km SW of Hebgen Lake Estates, Montana · depth 5 km
M 5.1 mbJanuary 6, 1965
19 km NW of Lima, Montana · depth 5 km
M 5.2 mwOctober 21, 1964
32 km WNW of Hebgen Lake Estates, Montana · depth 10 km
M 4.6 mbOctober 14, 1964
4 km NNW of Dayton, Montana · depth 33 km
M 4.6 mbOctober 9, 1964
2 km ESE of Lindisfarne, Montana · depth 33 km
M 4.7 mbSeptember 24, 1963
20 km NE of Hebgen Lake Estates, Montana · depth 33 km
M 4.5 mbFebruary 16, 1963
Western Montana · depth 33 km
M 5.0 ukAugust 20, 1959
39 km W of Hebgen Lake Estates, Montana · depth 5 km
M 4.7 ukAugust 19, 1959
32 km W of Hebgen Lake Estates, Montana · depth 5 km
M 5.0 ukAugust 19, 1959
15 km NE of West Yellowstone, Montana · depth 5 km
M 5.0 ukAugust 19, 1959
31 km W of Hebgen Lake Estates, Montana · depth 5 km
Source: U.S. Geological Survey, Earthquake Hazards Program. Older and smaller earthquakes are under-counted relative to recent decades as instrumentation improved. A record of past shaking is not a forecast. See About the Data.