Second Earthquake Recorded In South Dakota This Month Posted by Jeremy Anderson Date: June 17, 2021 10:50 am Leave a comment 515 Views Seismograph for earthquake detection or lie detector is drawing chart. 3D rendered illustration. Another earthquake has been recorded in South Dakota, the fifth since December. According to the United States Geological Survey, a 2.6 magnitude quake was recorded about 6:30 a.m. Wednesday with the epicenter about 60 miles east of Rapid City. It’s the second measurable earthquake this month. A 3.7 magnitude earthquake was recorded on June 4 on the border between South Dakota and Nebraska. The largest earthquake recorded in South Dakota was a magnitude 4.5 quake south of Huron in 1911.