*Takashi Chiba¹, Masatsugu Kodate¹, Osamu Kiguchi¹, Makoto Inoue¹, Hirokazu Madokoro², Takeshi Nagayosi¹ (1.Faculty of Bioresource Sciences, Akita Prefectural University, 2.Faculty of Systems Science and Technology, Akita Prefectural University)

*Yuichi Nishimura¹, Tetsuya Shinozaki², Takashi Chiba³, Purna Sulastya Putra⁴ (1.Graduate School of Science, Hokkaido University, 2.Center for Research in Isotopes and Environmental Dynamics (CRiED) University of Tsukuba, 3.Faculty of Bioresource Sciences, Akita Prefectural University, 4.Research Center for Geotechnology, Indonesian Institute of Sciences (LIPI))

*Erick Velasco R.¹, Kazuhisa Goto², Daisuke Sugawara³, Yuichi Nishimura⁴, Takahiro Shinohara¹, Takashi Chiba⁵ (1.Earth Science Department, Graduate Faculty of Science, Tohoku University, 2.Department of Earth and Planetary Science, Graduate School of Science, the University of Tokyo, 3.Museum of Natural and Environmental History, Shizuoka, 4.Institute of Seismology and Volcanology, Graduate School of Science, Hokkaido University, 5.Faculty of Bioresource Sciences, Akita Prefecture University.)

*Takashi Chiba¹, Yuichi Nishimura² (1.Faculty of Bioresource Sciences, Akita Prefectural University, 2.Institute of Seismology and Volcanology, Faculty of Science, Hokkaido University)

*Yuichi Nishimura¹, Purna Sulastya Putra², Septriono Hari Nugroho², Eko Yulianto², Takashi Chiba³ (1.Graduate School of Science, Hokkaido University, 2.Research Center for Geotechnology, Indonesian Institute of Sciences (LIPI), 3.Faculty of Bioresource Sciences, Akita Prefectural University)