Map of the seismicity of Montana from 1982 to 2000, with M>2.5 shocks in yellow, and M>5.5 shocks as orange stars. Source: Montana Bureau of Mines and Geology

Map of the seismicity of Montana from 1982 to 2000, with M>2.5 shocks in yellow, and M>5.5 shocks as orange stars. Source: Montana Bureau of Mines and Geology

Map of the seismicity of Montana from 1982 to 2000, with M>2.5 shocks in yellow, and M>5.5 shocks as orange stars. Source: Montana Bureau of Mines and Geology