Earthquake hits Great Falls, no impact to Malmstrom, NorthWestern Energy, Calumet operations
Updated 10:20 p.m. Jan. 29 A 4.2 magnitude earthquake shook the Great Falls region around 12:41 p.m. Jan. 29. According to the U.S. Geological Survey, the epicenter was about eight kilometers northeast of Black Eagle at a depth of 22.5 kilometers. A 2.7 magnitude aftershock was recorded at 5:46 p.m. about five kilometers north-northwest of Malmstrom Air Force Base at
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