Earthquake Recorded Friday Near Edgemont Posted by John Axtell Date: March 28, 2021 812 Views The US Geological Survey has confirmed a 3.4 magnitude earthquake took place near Edgemont at 8:52 MT Friday morning. The USGS says the epicenter was a little more than 3-miles underground and about 6 miles east-northeast of Edgemont. Residents reported feeling the shaking, but no damage or injuries have been reported from the tremblor. In the past six months, South Dakota has seen two other earthquakes. Both were less than 3.5 on the Richter Scale. The largest earthquake recorded in South Dakota was in 1911, a magnitude 4.5 quake south of Huron.