Yoshiaki Suzuki, AIST - National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan, Ryuji Tada, Chiba Institute of Technology, Chiba, Japan, Kana Nagashima, JAMSTEC, Yokosuka, Japan, Takeshi Nakagawa, University of Newcastle, Callaghan, Australia, Tsuyoshi Haraguchi, Osaka City Univ, Osaka, Japan, Katsuya Gotanda, Chiba University of Commerce, Chiba, Japan and SG12/06 Project members