Relocating the 2011 Tohoku-oki earthquakes (M 6.0-9.0)
Relocating the 2011 Tohoku-oki earthquakes (M 6.0-9.0)
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重新定位 2011 年东北冲地震（震级 6.0 至 9.0）
DOI：
10.1016/j.tecto.2012.10.019
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发表时间：
2013-02-26
期刊：
影响因子：
2.9
通讯作者：
Zhao, Dapeng
中科院分区：
文献类型：
--
作者：
Huang, Zhouchuan;Zhao, Dapeng
2011 年 3 月 11 日发生的东北冲大地震（震级 9.0）在日本东北部前弧伴随着近 100 次大前震和余震（震级 >= 6.0）。在这项研究中，我们使用三种不同的速度模型重新定位了其中 77 个大型事件。更新的三维速度模型显着减少了地震重定位中的走时残差。我们发现，大逆冲地震一般发生在高速斑块内或周围，这表明大逆冲地震的产生是受逆冲带构造异质性控制的。高速斑块可能代表巨型逆冲断层带的凹凸不平，俯冲的太平洋板块和上覆的鄂霍次克板块可能强烈耦合。上覆鄂霍次克板块的地壳发生了多次非逆冲地震，表明东北冲主震改变了该地区的应力场。目前的结果可能会提高我们对日本东北弧的俯冲动力学和地震构造的理解。 (C) 2012 Elsevier B.V. 保留所有权利。
The great Tohoku-oki earthquake (Mw 9.0) on 11 March 2011 was accompanied by nearly 100 large foreshocks and aftershocks (M >= 6.0) in the Northeast Japan forearc. In this study we relocated 77 of these large events using three different velocity models. An updated three-dimensional velocity model significantly reduced the travel-time residuals in the earthquake relocation. We found that the large thrust earthquakes are generally located in or around high-velocity patches, suggesting that the generation of the large thrust earthquakes is controlled by structural heterogeneities in the megathrust zone. The high-velocity patches may represent asperities in the megathrust zone where the subducting Pacific plate and the overriding Okhotsk plate may be coupled strongly. Many non-thrust earthquakes occurred in the crust of the overriding Okhotsk plate, indicating that the stress field there has been changed by the Tohoku-oki mainshock. The present results may improve our understanding of the subduction dynamics and seismotectonics of the Northeast Japan arc. (C) 2012 Elsevier B.V. All rights reserved.