The expected recurrence of the 1811-1812 New Madrid sequence about every 500 years (Tuttle et al., 2002) dominates the U.S. Geological Survey (USGS) estimates of seismic hazard over much of the central United States (CUS) (Harmsen et al., 1999; Frankel et al.,2000, 2002). While earthquakes in the New Madrid seismic zone (NMSZ) apparently dominated CUS seismicity in the first two decades of the 19th century, more moment magnitude M 5.0 and larger earthquakes have occurred in the Illinois basin in southern Illinois and Indiana in the past 150 years than in the NMSZ...

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