*Katsuhiko Suzuki¹, Asako Takamasa^2,1, Yusuke Fukami^3,1, Tsuyoshi Iizuka⁴, Yuji Orihashi⁵, Ryuichi Shinjo⁶, Takeshi Hanyu⁷ (1.Submarine Resources Research Center, JAMSTEC, 2.JAPAN NUS CO., Ltd, 3.Department of Chemistry, Gakushuin University, 4.Department of Earth and Planetary Science, The University of Tokyo, 5.Department of Earth and Environmental Sciences, Hirosaki University, 6.Department of Physics and Earth Sciences, University of the Ryukyus , 7.Volcanoes and Earth’s Interior Research Center, JAMSTEC)

*Masataka Aizawa¹, Ryuichi Shinjo², Satoshi Okamura^3,4 (1.Graduate School of Engineering and Sience, University of the Ryukyus, 2.Faculty of Science, University of the Ryukyus, 3.Hokkaido Education University, 4.Hokkaido Soil-Research Co-op.)

*Ryuichi Shinjo¹, Tomoki Amuro¹, Kohei Oura¹, Kazuya Oshiro¹, Shiro Tahara¹, Harutaka Sakai² (1.Department of Physics and Earth Sciences, University of the Ryukyus, 2.Department of Geology and Mineralogy, Kyoto University)

*Kazuma Oikawa¹, Hideko Takayanagi¹, Ryuichi Shinjo², Kazuyoshi Endo³, Masa-aki Yoshida⁴, Yasufumi Iryu¹ (1.Institute of Geology and Paleontology Graduate School of Science Tohoku University, 2.Department of Physics and Earth Sciences, University of the Ryukyus, 3.Department of Earth and Planetary Science, Tokyo University, 4.Shimane University Faculty of Life and Environmental Science)

*Ryuji Asami¹, Rikuto Hondoh², Ryu Uemura³, Ryuichi Shinjo⁴, Chuan-Chou Shen⁵, Akihiro Kano⁶, Masaki Fujita⁷, Shinji Yamasaki⁸, Hideko Takayanagi¹, Yasufumi Iryu¹ (1.Graduate School of Science, Tohoku University, 2.Faculty of Science, Tohoku University, 3.Graduate School of Environmental Studies, Nagoya University, 4.Faculty of Science, University of the Ryukyus, 5.National Taiwan University, 6.School of Science, the University of Tokyo, 7.National Museum of Nature and Science, 8.Okinawa Prefectural Museum and Art Museum)

*Ryuichi Shinjo¹ (1.Department of Physics and Earth Sciences, University of the Ryukyus)