*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)

*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)