*Osamu Kazaoka1, Itaru Ogitsu1, Hisashi Yabusaki1, Eri Honda1, Takeshi Yoshida1, Syun Kameyama2, Atsushi Kagawa1, Masaaki Morisaki1, Yoshihiro Takeshita3, Yasuhumi Satoguchi4, Yasuomi Nakazato5, Naohisa Nishida6, Makoto Okada7, Yusuke Suganuma8, Kentaro Izumi9, Hisao Kumai10, Hisashi Nirei11
(1.Research Institute of Environmental Geology, Chiba, 2.Environmental Protection division of Chiba Prefectural Government, 3.Institute of Education, Shinshu University, 4.Lake Biwa Museum, 5.National Institute for Rural Engineering, 6.Geological Survey of Japan, AIST, 7.Ibaraki University, 8.National Institute of Polar Research, 9.National Institute for Environmental Studies, 10.Osaka City University, 11.Japan Branch of GEM-IUGS)