Earthquake LogM7.2 earthquake, Montana Earthquake, 1959-08-18
MagnitudeM7.2mw
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Depth12 km
Time (UTC)1959-08-18 06:37
Rank in 19594 / 106among M6+
Rank since 1900900 / 14,458
Energy vs an M6×63approx.
The 1959 Hebgen Lake, Montana Earthquake · 44.79, -111.20
M6.5+ within 300 km (largest first)
M7.2
M6.9
M6.6
M6.5
Earlier M6+ within 300 km
| Event | Time (UTC) | Depth | Place |
|---|---|---|---|
| M6.1 1947-11-23 | 1947-11-23 09:46 | 15 km | 30 km SSW of Big Sky, Montana |
| M6.1 1944-07-12 | 1944-07-12 19:30 | 10 km | 37 km N of Stanley, Idaho |
| M6.1 1935-10-19 | 1935-10-19 04:48 | 15 km | The 1935 Helena, Montana Earthquakes (Mainshock) |
| M6.4 1925-06-28 | 1925-06-28 02:05 | – | Clarkston Valley, Montana (Aftershock) |
| M6.6 1925-06-28 | 1925-06-28 01:21 | – | The 1925 Clarkston Valley, Montana Earthquake |
Energy ratio uses the rule that one magnitude unit is about 32 times the energy. Magnitudes and locations are USGS values and can differ from national agencies. Older records are less complete and less precise.