title: Displacement above the hypocenter of the 2011 Tohoku-Oki earthquake.
abstract: The moment magnitude (M(w)) = 9.0 2011 Tohoku-Oki mega-thrust earthquake occurred off the coast of northeastern Japan. Combining Global Positioning System (GPS) and acoustic data, we detected very large sea-floor movements associated with this event directly above the focal region. An area with more than 20 meters of horizontal displacement, that is, four times larger than those detected on land, stretches several tens of kilometers long along the trench; the largest amount reaches about 24 meters toward east-southeast just above the hypocenter. Furthermore, nearly 3 meters of vertical uplift occurred, contrary to observed terrestrial subsidence.
authors: Hydrographic and Oceanographic Department, Japan Coast Guard, 5-3-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan. eisei@jodc.go.jp
authors: Mariko
authors: M
authors: Sato
authors: Tadashi
authors: T
authors: Ishikawa
authors: Naoto
authors: N
authors: Ujihara
authors: Shigeru
authors: S
authors: Yoshida
authors: Masayuki
authors: M
authors: Fujita
authors: Masashi
authors: M
authors: Mochizuki
authors: Akira
authors: A
authors: Asada