Custer County, SD has a low earthquake risk, with a total of 2 earthquakes since 1931. The USGS database shows that there is a 1.26% chance of a major earthquake within 50km of Custer County, SD within the next 50 years. The largest earthquake within 30 miles of Custer County, SD was a 3.7 Magnitude in 1996.
View the probability of a major earthquake within the next 50 years in Custer County, SD.
View the number of earthquake incidents in Custer County, SD by year that are more than 2.5 Magnitude.
Total Number of Earthquakes in Custer County, SD within 30 miles. All distances and depths in the table are measured in miles.