The vast majority of earthquakes in the United States occur along the west margin where North America impinges on the Pacific and Juan de Fuca plates. The major exceptions to this pattern occur in the central United States, the New Madrid and Wabash Valley (NMWV) seismic zones (Fig. 1a). These two seismic zones appear to be linked (Mueller et al., 2004; Li et al., 2005) and are herein called the NMWV seismic zone. Because the NMWV region has a large population and is identified on U.S. Geological Survey (USGS) seismic hazard maps as having...

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