*Tomomi Kani¹, Keiji Misawa², Noritoshi Morikawa³, Kohei Kazahaya³, Fumitake Kusuhara⁴, Yasutaka Terakado⁵ (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.Graduate School of Human Development and Environment, Kobe University )

*Tomomi Kani¹, Yukio Isozaki², Keiji Misawa³, Akira Ishikawa⁴, Shigekazu Yoneda⁵ (1.Department of Earth and Environmental Sciences, Kumamoto University, 2.The University of Tokyo, 3.National Institute of Polar Research, 4.Tokyo Institute of Technology, 5.National Museum of Nature and Science )