title: The 2011 Tohoku-Oki earthquake: displacement reaching the trench axis.
abstract: We detected and measured coseismic displacement caused by the 11 March 2011 Tohoku-Oki earthquake [moment magnitude (M(W)) 9.0] by using multibeam bathymetric surveys. The difference between bathymetric data acquired before and after the earthquake revealed that the displacement extended out to the axis of the Japan Trench, suggesting that the fault rupture reached the trench axis. The sea floor on the outermost landward area moved about 50 meters horizontally east-southeast and ~10 meters upward. The large horizontal displacement lifted the sea floor by up to 16 meters on the landward slope in addition to the vertical displacement.
authors.affiliation: Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan. toshi@jamstec.go.jp
authors.forename: Toshiya
authors.initials: T
authors.lastname: Fujiwara
authors.forename: Shuichi
authors.initials: S
authors.lastname: Kodaira
authors.forename: Tetsuo
authors.initials: T
authors.lastname: No
authors.forename: Yuka
authors.initials: Y
authors.lastname: Kaiho
authors.forename: Narumi
authors.initials: N
authors.lastname: Takahashi
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Kaneda