Deformation processes at the toe of the Japan Trench off Tohoku

对地震和测深数据的先进处理和分析将阐明与2011年东北大地震相关的同震滑动记录。这种改进的构造成像将增加对变形过程的理解，包括日本俯冲带趾部附近的大作用行为，包括东北地震的海啸震源区。综合海洋钻探项目在断层处发现了沉降的下降，本研究将评估该构造的沿走向范围。除了解决与最近地震相关的变形问题外，研究结果还将在前所未有的细节层面上解决楔形增生动力学问题，特别关注沉积物侵蚀与底板侵蚀是否正在发生。

Advanced processing and analysis of seismic and bathymetric data will illuminate the record of co-seismic slip associated with the great Tohoku earthquake of 2011. This improved structural imaging should increase understanding of deformation processes, including megasplay behavior, near the toe of the Japan subduction zone including the tsunami source region(s) for the Tohoku event. A step-down in the decollment was recognized at an Integrated Ocean Drilling Program site at the fault and this study will assess the along-strike extent of that structure. In addition to addressing deformation associated with the recent earthquake, results will also address accretionary wedge dynamics at a level of detail not achieved previously, with particular focus on whether sediment erosion versus underplating is occurring.