Thrust fault characteristics inferred from 3D seismic reflection data from the Nankai Trough subduction zone, southwest Japan
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The study of fault properties within the Nankai Trough subduction zone is of interest due to the periodic occurrence of highly destructive earthquakes and tsunamis in this region. Therefore, for better understanding of the seismogenic and tsunamigenic potential of faults within the accretionary prism, my research focuses on characterizing fault geometry and seismic reflectivity in the major splay fault system based on observations from 3D seismic reflection data. My observations suggest that faulting within the splay fault system is evolving in the landward direction and that fluid migration may be occurring along some of the most recently active faults in the splay system. In addition, modeling results indicate that a strong negative-polarity fault-plane reflection in the splay fault system is caused by a thin layer of low acoustic impedance material, which could be representative of a major fluid conduit.