12/02/26 15:16:53.94
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URLﾘﾝｸ(www.sciencemag.org)
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 (MW) 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.