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*Keisuke SUZUKI
Geological Survey of Japan, AIST, 1–1–1 Higashi, Tsukuba, Ibaraki 305–8567, Japan
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Toshiyuki Kurihara
Department of Geology, Faculty of Science, Niigata University, Niigata 950–2181, Japan
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Hidetoshi Hara
Geological Survey of Japan, AIST, 1–1–1 Higashi, Tsukuba, Ibaraki 305–8567, Japan
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Kenichi Ishikawa
Asahi Kohmatsu Co. Ltd, Ueno 110–0002, Japan
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Takeru Otsuki
East Japan Railway Company, 2–2–2 Yoyogi, Shibuya-ku, Tokyo, Japan
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Hayato Ueda
Department of Geology, Faculty of Science, Niigata University, Niigata 950–2181, Japan