*Akihiro Nagaya¹, Gou Fujie², Shuichi Kodaira², Satoru Tanaka², Yojiro Yamamoto², Hiroko Sugioka^3,1, Hiroki Miyamachi⁴, Tetsuo Matsuno³, Hironori Otsuka³, Keita Suzuki⁵, Nobukazu Seama^1,3 (1.Department of Planetology, Graduate School of Science, Kobe University, 2.Japan Agency for Marine-Earth Science and Technology, 3.Kobe Ocean-Bottom Exploration Center, Kobe University, 4.Graduate School of Science and Engineering, Kagoshima University, 5.Nippon Marine Enterprises, Ltd)

Naori Morimoto¹, *Kazuo Nakahigashi¹, Seishiro Furuyama¹, Yusuke Yamashita², Yukihiro Nakatani³, Shuichiro Hirano³, Hiroshi Yakiwara³, Hiroki Miyamachi³, Takeshi Matsushima⁴, Tomoaki Yamada⁵, Masanao Shinohara⁵ (1.Tokyo University of Marine Science and Technology, 2.Disaster Prevention Research Institute, Kyoto University, 3.Kagoshima University, 4.Institute of Seismology and Volcanology, Faculty of Science, Kyushu University, 5.Earthquake Research Institute, University of Tokyo)