There are 40 earthquake incidents in South Dakota on record since 1931. The state averages less than 1 earthquake per year. The largest earthquake on record for South Dakota occurred on 03/04/1983, with a depth of 5.0 miles and a magnitude of 4.4 on the Richter scale in Hyde County, SD.
Yearly Average Number of Earthquakes in South Dakota
Total Number of Earthquakes in South Dakota since 1931