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Wyoming Earthquake History
Since August 18, 1959, the USGS has recorded 38 earthquakes of magnitude 4.5 or greater in Wyoming, 1 of them magnitude 6 or above. The strongest was M 6.3.
By decade
'50
'70
'80
'90
'00
'10
'20
Strongest in Wyoming
M 6.3 · 22 km SW of Mammoth, WyomingAugust 18, 1959M 5.9 · 26 km SSE of Mammoth, WyomingJune 30, 1975M 5.8 · 4 km SSE of Auburn, WyomingFebruary 3, 1994M 5.7 · 13 km SSW of Mammoth, WyomingAugust 18, 1959M 5.5 · 25 km SSW of Mammoth, WyomingDecember 8, 1976M 5.3 · 29 km W of Esterbrook, WyomingOctober 18, 1984M 5.3 · 20 km S of Mammoth, WyomingOctober 19, 1976M 5.1 · 23 km S of Mammoth, WyomingJune 30, 1975M 5.0 · 37 km W of Gillette, WyomingMay 29, 1984M 5.0 · 10 km W of Atlantic City, WyomingNovember 3, 1984
All recorded earthquakes
M 4.7 mlJanuary 22, 2026
40 km S of Evanston, Wyoming · depth 15 km
M 4.8 mwrAugust 27, 2016
4 km ENE of Bondurant, Wyoming · depth 12 km
M 4.8 mwMarch 30, 2014
22 km S of Mammoth, Wyoming · depth 6 km
M 4.8 mwrSeptember 21, 2013
20 km W of Fort Washakie, Wyoming · depth 76 km
M 4.8 mwrAugust 5, 2010
19 km E of Kelly, Wyoming · depth 5 km
M 5.0 mwcJanuary 7, 2004
20 km ESE of Kelly, Wyoming · depth 3 km
M 4.8 mbFebruary 11, 1994
3 km SSE of Auburn, Wyoming · depth 5 km
M 4.5 mbFebruary 7, 1994
4 km SW of Fairview, Wyoming · depth 5 km
M 4.7 mbFebruary 4, 1994
4 km WNW of Fairview, Wyoming · depth 5 km
M 5.8 mwFebruary 3, 1994
4 km SSE of Auburn, Wyoming · depth 8 km
M 4.7 mbDecember 28, 1993
38 km NE of Bondurant, Wyoming · depth 8 km
M 4.6 mbSeptember 7, 1985
14 km SSE of Hoback, Wyoming · depth 5 km
M 4.8 mbAugust 21, 1985
12 km S of Hoback, Wyoming · depth 5 km
M 5.0 mbNovember 3, 1984
10 km W of Atlantic City, Wyoming · depth 5 km
M 4.5 mbOctober 18, 1984
36 km W of Esterbrook, Wyoming · depth 33 km
M 5.3 mwOctober 18, 1984
29 km W of Esterbrook, Wyoming · depth 33 km
M 4.9 mwSeptember 8, 1984
41 km W of Gillette, Wyoming · depth 20 km
M 5.0 mbMay 29, 1984
37 km W of Gillette, Wyoming · depth 18 km
M 4.5 mbDecember 20, 1983
1 km NE of Hoback, Wyoming · depth 5 km
M 4.9 mbDecember 19, 1976
24 km SSW of Mammoth, Wyoming · depth 5 km
M 4.5 mbDecember 9, 1976
24 km SSW of Mammoth, Wyoming · depth 5 km
M 4.9 mbDecember 9, 1976
23 km SSW of Mammoth, Wyoming · depth 6 km
M 5.5 mbDecember 8, 1976
25 km SSW of Mammoth, Wyoming · depth 5 km
M 5.3 mbOctober 19, 1976
20 km S of Mammoth, Wyoming · depth 5 km
M 4.8 mbSeptember 3, 1976
53 km NE of Kaycee, Wyoming · depth 10 km
M 4.5 mbJuly 5, 1975
29 km SSE of Mammoth, Wyoming · depth 5 km
M 4.5 mbJuly 3, 1975
31 km SE of Mammoth, Wyoming · depth 5 km
M 4.6 mbJuly 2, 1975
21 km SSW of Mammoth, Wyoming · depth 5 km
M 4.8 mbJuly 1, 1975
14 km SE of Mammoth, Wyoming · depth 5 km
M 4.9 mbJune 30, 1975
32 km SSE of Mammoth, Wyoming · depth 5 km
M 4.7 mbJune 30, 1975
32 km SSE of Mammoth, Wyoming · depth 5 km
M 5.1 mbJune 30, 1975
23 km S of Mammoth, Wyoming · depth 5 km
M 5.9 msJune 30, 1975
26 km SSE of Mammoth, Wyoming · depth 7 km
M 4.6 mbJune 30, 1975
23 km SSE of Mammoth, Wyoming · depth 5 km
M 4.8 mbMarch 25, 1975
29 km NW of Jeffrey City, Wyoming · depth 10 km
M 4.8 mbApril 22, 1973
15 km N of Jeffrey City, Wyoming · depth 33 km
M 6.3 mwAugust 18, 1959
22 km SW of Mammoth, Wyoming · depth 10 km
M 5.7 mwAugust 18, 1959
13 km SSW of Mammoth, Wyoming · depth 15 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.