A slump in the trench: Tracking the impact of the 2011 Tohoku-Oki earthquake
A slump in the trench: Tracking the impact of the 2011 Tohoku-Oki earthquake
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DOI：
10.1130/g34477.1
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发表时间：
2013-04
期刊：
影响因子：
5.8
通讯作者：
M. Strasser;M. Kölling;C. S. Ferreira;H. Fink;T. Fujiwara;S. Henkel;K. Ikehara;T. Kanamatsu;K. Kawamura;S. Kodaira;M. Römer;G. Wefer;Jamstec Cruise Mr E scientists
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文献类型：
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作者：
M. Strasser;M. Kölling;C. S. Ferreira;H. Fink;T. Fujiwara;S. Henkel;K. Ikehara;T. Kanamatsu;K. Kawamura;S. Kodaira;M. Römer;G. Wefer;Jamstec Cruise Mr E scientists
我们提供了日本海沟的差分测深和沉积岩芯数据，这些数据是在 2011 年东北冲（日本近海）地震后采样的，以记录沿海沟轴线的显着测深和结构变化与海沟中的大塌陷（约 27.7 km 2 ）有关。滑落沉积物中的瞬态地球化学信号以及受扰动的 SO 4 2- 剖面随时间的扩散重新平衡分析限制了滑落对 2011 年地震的触发。我们提出了地震滑移至海沟与俯冲地垒结构上方旋转滑落之间的因果关系。我们得出的结论是，地震引发的塌陷是海沟沉积物堆积到弧前的主要因素，并假设在单次大逆冲地震期间，可能会偶发性地发生棱柱体向前生长和变形锋面向海推进超过 2 公里的情况。
We present differential bathymetry and sediment core data from the Japan Trench, sampled after the 2011 Tohoku-Oki (offshore Japan) earthquake to document that prominent bathymetric and structural changes along the trench axis relate to a large (∼27.7 km 2 ) slump in the trench. Transient geochemical signals in the slump deposit and analysis of diffusive re-equilibration of disturbed SO 4 2– profiles over time constrain the triggering of the slump to the 2011 earthquake. We propose a causal link between earthquake slip to the trench and rotational slumping above a subducting horst structure. We conclude that the earthquake-triggered slump is a leading agent for accretion of trench sediments into the forearc and hypothesize that forward growth of the prism and seaward advance of the deformation front by more than 2 km can occur, episodically, during a single-event, large mega-thrust earthquake.