*Yusuke SUGANUMA¹, Makoto OKADA¹, Osamu KAZAOKA², Koji KAMEO³, Martin J. Head⁴, Naohisa NISHIDA⁵, Takeshi YOSHIDA⁶, Itaru OGITSU⁶, Shun KAMEYAMA⁶, Hiroomi NAKAZATO⁷, Kentaro IZUMI⁸, Yoshimi KUBOTA⁹, Manami SUGAYA², Hisashi NIREI⁶, Hisao KUMAI¹⁰ (1.National Institute of Polar Research, 2.Ibaraki Univeristy, 3.Chiba University, 4.Brock University, 5.Geological survery of Japan, AIST, 6.Research Institute of Environmental Geology, 7.National Institute for Rural Engineering, 8.National Institute for Environmental Studies, 9.National Museum of Nature and Science, 10.Osaka City University)

*Osamu KAZAOKA¹, Naohisa NISHIDA², Makoto OKADA³, Yusuke SUGANUMA⁴, Shun KAMEYAMA⁵, Takeshi YOSHIDA¹, Masaaki MORISAKI¹, Atsushi KAGAWA¹, Itaru OGITSU¹, Kentaro IZUMI⁶, Hiroomi NAKAZATO⁷, Hisao KUMAI⁸, Hisashi NIREI⁹ (1.Research Institute of Environmental Geology, Chiba, 2.Geological Survey of Japan, AIST, 3.Ibaraki University, 4.National Institute of Polar Research, 5.Environmental Protection division of Chiba Prefectural Government, 6.University of Tokyo, 7.National Institute for Rural Engineering, 8.Osaka City University, 9.Japan Branch of Geoscience for Environmental Management, IUGS)

*Kentaro IZUMI¹, Naohisa NISHIDA², Osamu KAZAOKA³, Yusuke SUGANUMA⁴, Makoto OKADA⁵, Takeshi YOSHIDA³, Itaru OGITSU³, Hiroomi NAKAZATO⁶, Shun KAMEYAMA³, Atsushi KAGAWA³, Masaaki MORISAKI³, Masayuki HYODO⁷, Hisashi NIREI⁸ (1.Center for Environmental Biology and Ecosystem Studies, NIES, 2.Institute of Geology and Geoinformation, Geological Survey of Japan, AIST, 3.Research Institute of Environmental Geology, Chiba, 4.National Institute of Polar Research, 5.Department of Earth Sciences, Faculty of Science, Ibaraki University, 6.National Institute for Rural Engineering, 7.Research Center for Inland Seas, Kobe University, 8.International Union of Geological Science for Environmental Management)

*Takeshi YOSHIDA¹, Itaru OGITSU¹, Osamu KAZAOKA¹, Makoto OKADA², Yusuke SUGANUMA³, Koji KAMEO⁴, Hisashi NIREI⁵, Nobuyuki AIDA⁶, Hisao KUMAI⁷, Naohisa NISHIDA⁸, Kentaro IZUMI⁹ (1.Reserch Institute of Environmental Geology, Chiba, 2.Ibaraki University, 3.National Institute of Polar Research, 4.Chiba University, 5.Japan Branch of Geoscience for Environmental Management, 6.Shumei University, 7.Osaka City University, 8.GSJ-AIST, 9.University of Tokyo)

*Takeshi YOSHIDA¹, Itaru OGITSU¹, Osamu KAZAOKA¹, Makoto OKADA², Yusuke SUGANUMA³, Koji KAMEO⁴, Hisashi NIREI⁵, Nobuyuki AIDA⁶, Hisao KUMAI⁷, Naohisa NISHIDA⁸, Kentaro IZUMI⁹ (1.Reserch Institute of Environmental Geology, Chiba, 2.Ibaraki University, 3.National Institute of Polar Research, 4.Chiba University, 5.Japan Branch of Geoscience for Environmental Management, 6.Shumei University, 7.Osaka City University, 8.GSJ-AIST, 9.University of Tokyo)