*Kohei Yamashita^1,2, Jinichiro Maeda³, Masako Yoshikawa⁴, Tomoyuki Shibata⁴, Toru Yamasaki² (1.Department of Natural History Sciences, Graduate School of Science, Hokkaido University, 2.Research Institute of Geology and Geoinformation, Geological Survey of Japan, AIST, 3.Department of Natural History Sciences, Faculty of Science, Hokkaido University, 4.Beppu Geothermal Research Laboratory, Kyoto University)

*Fumitoshi Morisato¹, Tsuyoshi Iizuka¹, Hirochika Sumino², Tomoyuki Shibata³, Masako Yoshikawa³, Kazuhito Ozawa¹ (1.Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 2.Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3.Beppu Geothermal Research Laboratory, Kyoto University)