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*Satoshi Tonai
Department of Ocean Floor Geoscience, Ocean Research Institute, the University of Tokyo
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Shoichi Kiyokawa
Department of Earth and Planetary Sciences, Graduate School of Sciences, Kyushu University
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Hisashi Oiwane
Department of Ocean Floor Geoscience, Ocean Research Institute, the University of Tokyo
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Juichiro Ashi
Department of Ocean Floor Geoscience, Ocean Research Institute, the University of Tokyo