Development of an analysis and observation method of active seismic surveys for understanding entities of large-earthquake asperities

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The fault plane of repeating large subduction earthquakes is located where the mechanical coupling between the subducting and overriding plates is strong along the plate interface at depths more than 10 km deep beneath the seafloor. I developed a method to analyze waveform records obtained in marine active-source seismic surveys to understand factors that control the mechanical coupling along the plate interface. I successfully improve temporal resolution of the waveforms, and clearly identified arrivals of refracted waves and plate-interface reflected waves.