title: Large fault slip peaking at trench in the 2011 Tohoku-oki earthquake.
abstract: During the 2011 magnitude 9 Tohoku-oki earthquake, very large slip occurred on the shallowest part of the subduction megathrust. Quantitative information on the shallow slip is of critical importance to distinguishing between different rupture mechanics and understanding the generation of the ensuing devastating tsunami. However, the magnitude and distribution of the shallow slip are essentially unknown due primarily to the lack of near-trench constraints, as demonstrated by a compilation of 45 rupture models derived from a large range of data sets. To quantify the shallow slip, here we model high-resolution bathymetry differences before and after the earthquake across the trench axis. The slip is determined to be about 62 m over the most near-trench 40 km of the fault with a gentle increase towards the trench. This slip distribution indicates that dramatic net weakening or strengthening of the shallow fault did not occur during the Tohoku-oki earthquake.
authors.affiliation: School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia, Canada V8P 5C2.
authors.forename: Tianhaozhe
authors.initials: T
authors.lastname: Sun
authors.affiliation: School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia, Canada V8P 5C2.|Pacific Geoscience Centre, Geological Survey of Canada, Natural Resources Canada, 9860 West Saanich Road, Sidney, British Columbia, Canada V8L 4B2.
authors.forename: Kelin
authors.identifier: 0000-0001-7599-7798
authors.initials: K
authors.lastname: Wang
authors.affiliation: R&D Center for Earthquake and Tsunami (CEAT), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Natsushima-cho 2-15, Yokosuka 237-0061, Japan.
authors.forename: Toshiya
authors.initials: T
authors.lastname: Fujiwara
authors.affiliation: R&D CEAT, JAMSTEC, Showa-machi 3173-25, Kanazawa-ku, Yokohama 236-0001, Japan.
authors.forename: Shuichi
authors.initials: S
authors.lastname: Kodaira
authors.affiliation: Pacific Geoscience Centre, Geological Survey of Canada, Natural Resources Canada, 9860 West Saanich Road, Sidney, British Columbia, Canada V8L 4B2.
authors.forename: Jiangheng
authors.initials: J
authors.lastname: He