The Wabash Valley seismic zone in southern Illinois and Indiana is a northeastern extension of the New Madrid seismic zone (Figure 1). Like New Madrid, the Wabash zone is underlain by a failed Precambrian rift, which plays a role in controlling the recent faulting (Braile et al. 1986; Sexton et al. 1986; Bear et al. 1997). Paleoliquefaction deposits indicate the past occurrence of large earthquakes in the Wabash zone (Obermeier 1998) that may have been comparable to those that occurred in the New Madrid zone in 1811–1812 (Hough et al. 2000...

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