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Atsushi Matsuoka
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Satoshi Yamakita
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Masayuki Sakakibara
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Kenichiro Hisada
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Author's Organization:Department of Geology,Faculty of Science ,Niigata University Department of Earth Sciences,Faculty of Education,Miyazaki University Department of Earth Sciences,Faculty of Science,Ehime University Institute of Geoscience,University of Tsukuba