Geometry of plate boundary and seismic structure beneath the southern Ryukyu Trench subduction zone deduced from passive seismic observation

Yojiro Yamamoto1, Tsutomu Takahashi1, Yasushi Ishihara2, Yuka Kaiho1, Ryuta Arai2, Ayako Nakanishi1, Koichiro Obana1, Seiichi Miura1, Shuichi Kodaira3 and Yoshiyuki Kaneda4, (1)JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan, (2)JAMSTEC, Yokohama, Japan, (3)Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan, (4)Nagoya University, Nagoya, Japan