I have no Fracking idea
http://www.scearthquakes.com/
http://www.dnr.sc.go.../earthquake.htm
In South Carolina, approximately 70 percent of the earthquakes occur in the Coastal Plain and most are clustered around three areas west and north of Charleston: Ravenel-Adams Run-Hollywood, Middleton Place-Summerville, and Bowman. These faults and other geologic structures related to the earthquakes are hidden by the thick sequence of sediments. Therefore, few clues to the causes of earthquakes in the Coastal Plain can be found at the surface. To unmask these hidden geologic structures, geologists are using geophysical techniques, recorded seismic activity (see Figure 9), or both. In the Piedmont, studies of surface geology are beginning to offer important clues to the causes of quakes in South Carolina.