Wabash Valley seismic zone

The Wabash Valley seismic zone (also known as the Wabash Valley fault system or fault zone) is a tectonic region located in the Midwestern United States, centered on the valley of the lower Wabash River, along the state line between southeastern Illinois and southwestern Indiana. == Geology == The Wabash Valley seismic zone consists largely of vertically oriented ("normal") faults deeply buried under layers of sediment.

Source: Wikipedia — Wabash Valley seismic zone (CC BY-SA 4.0)