A fault plane solution of the earthquake confirmed two nodal planes both striking north-south and dipping approximately 45 degrees to the east and to the west . This faulting suggests dip slip reverse motion , and to a horizontal east-west axis of confining stress . Although there are no confirmed faults in the immediate epicentral region , the motion indicated corresponds to that along the Wabash Valley Seismic Zone roughly east of the region , responsible for the 2008 Illinois earthquake . The rupture also occurred partially on the New Madrid Fault , responsible for the great New Madrid earthquakes in 1812 , consisting of the most powerful earthquakes to hit the contiguous United States
2008 Illinois earthquake
2008 Illinois earthquake
Southern Illinois