Big Arm, MT has a very high earthquake risk, with a total of 230 earthquakes since 1931. The USGS database shows that there is a 82.17% chance of a major earthquake within 50km of Big Arm, MT within the next 50 years. The largest earthquake within 30 miles of Big Arm, MT was a 4.6 Magnitude in 1975.
View the probability of a major earthquake within the next 50 years in Big Arm, MT.
View the number of earthquake incidents in Big Arm, MT by year that are more than 2.5 Magnitude.
Total Number of Earthquakes in Big Arm, MT within 30 miles. All distances and depths in the table are measured in miles.