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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Seismic images of structural variations along the deformation front of the Andaman-Sumatra subduction zone: Implications for rupture propagation and tsunamigenesis
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Seismic images of structural variations along the deformation front of the Andaman-Sumatra subduction zone: Implications for rupture propagation and tsunamigenesis

机译：沿安达曼-苏门答腊俯冲带形变带前的构造变化的地震图像：对破裂传播和海啸成因的影响

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摘要

Seven deep seismic reflection profiles cover the 3000 km-long subduction system from Andaman to Southern Sumatra, including zones that ruptured in 2004, 2007, and 2010. We find that (1) the frontal zone is characterized by a series of thrusts bounding folded blocks of sediments with preserved layering, showing a northward transition from dominantly seaward vergence of the frontal thrusts to dominantly landward vergence of the frontal thrusts, (2) the accretionary wedge is characterized by poor reflection of the seismic energy likely to be due to a high degree of faulting and compaction of the sediments, and (3) the oceanic crust is highly disturbed by faults and topographic reliefs along most of the margin. Landward vergence at the deformation front is associated with a thick incoming sediment section. The segment of the subduction zone where landward vergence is observed corresponds to an area with high near-trench slip during the December 2004 earthquake, the main tsunami source, and lies just west of the hypocenters of several intraplate events (Mw > 7) in the years following the 2004 event.
机译：七个深地震反射剖面覆盖了从安达曼到苏门答腊南部的3000公里长的俯冲系统，包括在2004年，2007年和2010年破裂的区域。我们发现（1）正面区域的特征是一系列以逆冲作用为界的折叠块保留层状沉积物，显示从前冲的主要向海向北向前冲的主要向北向北过渡（2）增生楔的特征是地震能量的反射较差，这可能是由于高度（3）大部分边缘的断层和地形起伏极大地扰动了海洋地壳。形变前缘的陆上聚散与较厚的进入沉积物部分有关。俯冲带的向内观测到的部分对应于2004年12月地震的主要海啸源，即海沟附近高滑移的区域，位于该区域几次板内事件震源（Mw> 7）的西部。 2004年赛事之后的几年。

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