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Along-trench structural variation and seismic coupling in the northern Japan subduction zone

机译：日本北部俯冲带的沿海构造变化和地震耦合

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Large destructive interplate earthquakes, such as the 2011 Mw 9.0 Tohoku-oki earthquake, have occurred repeatedly in the northern Japan subduction zone. The spatial distribution of large interplate earthquakes shows distinct along-trench variations, implying regional variations in interplate coupling. We conducted an extensive wide-angle seismic survey to elucidate the along-trench variation in the seismic structure of the forearc and to examine structural factors affecting the interplate coupling beneath the forearc mantle wedge. Seismic structure models derived from wide-angle traveltimes showed significant along-trench variation within the overlying plate. In a weakly coupled segment, (i) the sediment layer was thick and flat, (ii) the forearc upper crust was extremely thin, (iii) the forearc Moho was remarkably shallow (about 5 km), and (iv) the P-wave velocity within the forearc mantle wedge was low, whereas in the strongly coupled segments, opposite conditions were found. The good correlation between the seismic structure and the segmentation of the interplate coupling implies that variations in the forearc structure are closely related to those in the interplate coupling.
机译：在日本北部的俯冲带中，反复发生了大型破坏性板间地震，例如2011年Mw 9.0东北冲地震。板块间大地震的空间分布表现出明显的海槽间变化，暗示板间耦合区域性变化。我们进行了广泛的广角地震勘测，以阐明前臂地震结构的沿沟槽变化，并研究影响前臂地幔楔下方板间耦合的结构因素。由广角传播时间得出的地震结构模型表明，上覆板块沿沟槽的变化很大。在弱耦合段中，（i）沉积物层厚且平坦，（ii）前臂上地壳非常薄，（iii）前臂莫霍面非常浅（约5 km），以及（iv）P-前臂地幔楔内的波速很低，而在强耦合段中却发现了相反的条件。地震结构与板间耦合的分段之间的良好相关性意味着前臂结构的变化与板间耦合的变化密切相关。

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