Historic Earthquakes

Hebgen Lake, Montana
1959 08 18 06:37:15 UTC (local 08/17)
Magnitude 7.3
Intensity X

Largest Earthquake in Montana

Isoseismal Map

Isoseismals are based on intensity estimates from data.

Isoseismal Map

Abridged from Seismicity of the United States, 1568-1989 (Revised), by Carl W. Stover and Jerry L. Coffman, U.S. Geological Survey Professional Paper 1527, United States Government Printing Office, Washington: 1993.