Shin'ichi Sakai

TL;DR: Tsunami waveform inversion for the 11 March, 2011, off the Pacific coast of Tohoku Earthquake (M 9.0) indicates that the source of the largest tsunami was located near the axis of the Japan trench as discussed by the authors.

TL;DR: In this article, a unified source model was constructed through joint inversion of teleseismic, strong motion, and geodetic datasets, which indicates that the 2011 Tohoku earthquake consists of three main ruptures.

TL;DR: In this paper, two cabled ocean-bottom tsunami sensors installed off Kamaishi successfully recorded the tsunami waveform just above the source rupture area, and the records indicated a characteristic two-stage tsunami development sequence: a smoothly increasing tsunami amplitude from 0 to 2 m during the first 800 s from the earthquake origin time, and a short-period impulsive tsunami with a peak of more than 5 m in the following 200 s.

TL;DR: In this article, a quadruple joint inversion of all these data to determine a source model most suitable for explaining all the datasets was performed, and the obtained source model, the maximum coseismic slip was approximately 35m and the total seismic moment was calculated to be 4.2 × 1022 nm, which yielded Mw = 9.0.

TL;DR: In this article, fine-scale variations of seismic velocities and converted teleseismic waves reveal the presence of zones of high-pressure fluids released by progressive metamorphic dehydration reactions in the subducting Philippine Sea plate in Tokai district, Japan.