(Pierre, SD) — People in Pierre are saying they felt the ground shake yesterday. According to the U.S. Geological Survey website, a 4.0 magnitude earthquake hit shortly after 2:30 in the afternoon just over 24 miles northwest of the state capital. Officials say that the quake was around six-and-a-half miles deep. So far, nearly 20 residents reported feeling the effects. The last earthquake reported in South Dakota happened near Wakonda in December of last year, measuring at 3.0.