The New Madrid seismic zone (NMSZ) in the central United States is one of the most active regions of intraplate seismicity in North America and site of the devastating 1811–1812 earthquake sequence (Nuttli, 1973; Johnston and Schweig, 1996). The NMSZ lies within the NE–SW trending Reelfoot rift (Fig. 1), which represents a failed rift arm that developed during the Late Proterozoic and Early Cambrian opening of the Iapetus Ocean on the southeast margin of early North America (Ervin and McGinnis, 1975). Fault offsets inferred from seismic reflection and trench data suggest that current...

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