*Tomomi Kani1, Keiji Misawa2, Noritoshi Morikawa3, Kohei Kazahaya3, Fumitake Kusuhara4, Shigekazu Yoneda5, Yasutaka Terakado6
(1.Department of Earth and Environmental Sciences, Kumamoto University, 2.National Institute of Polar Research , 3.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST) , 4.Central Research Institute of Electric Power Industry , 5.National Museum of Nature and Science, Tsukuba, Japan., 6.Graduate School of Human Development and Environment, Kobe University)