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Earthquake modeling and active faulting in the New Madrid seismic zone.


Body-wave propagation in the sediments overlying of the New Madrid Seismic Zone (NMSZ) was modeled, and a waveform modeling procedure to estimate earthquake source parameters was developed. The focal mechanisms and seismic moments of microearthquakes in the area were determined, using three-component PANDA data and the waveform modeling techniques. From analysis of a three-dimensional image of fault slip obtained by combining the focal mechanisms and JHD relocation, a seismotectonic model of the NMSZ was developed. The stress field of this area, the geometry and style of the active faulting, as well as the relationship to geologic features were inferred.