The legacy of the 1811-1812 New Madrid, Central United States, earthquakes is one of tremendous enigma. We are left with just enough contemporary information to provide a measure of constraint on the isoseismal contours and therefore magnitudes of the three principal events (Nuttli, 1973; Street, 1982; Johnston, 1996; Hough et al., 2000), yet given the sparse population density and limited documentation of effects, our interpretations will always be plagued by a significant degree of uncertainty. Although the magnitudes of the three principal New Madrid main shocks will likely never be established with precision, all contemporary...

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