Coupled afterslip and transient mantle flow after the 2011 Tohoku earthquake
Coupled afterslip and transient mantle flow after the 2011 Tohoku earthquake
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DOI：
10.1126/sciadv.aaw1164
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发表时间：
2019-09
期刊：
影响因子：
13.6
通讯作者：
J. Muto;J. D. Moore;S. Barbot;T. Iinuma;Y. Ohta;H. Iwamori
中科院分区：
文献类型：
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作者：
J. Muto;J. D. Moore;S. Barbot;T. Iinuma;Y. Ohta;H. Iwamori
2011年东北地震后的地壳形变揭示了瞬变地幔流和后滑之间复杂的相互作用。大地震后的震后形变模拟揭示了地幔的粘性结构和断层界面的摩擦性质。然而，对于巨型逆冲断层事件，粘弹性流和后滑在震后期间相互作用。我们探讨的作用后滑和粘弹性松弛和他们的相互作用后，2011年东北部的Mw（矩震级）9.0地震的震后变形与横向变化的详细模型分析的基础上，实验约束，岩石流变。粘弹性松弛和后滑移之间的机械耦合显着修改后滑移分布和表面变形。因此，我们强调的重要性，解决机械耦合的长期研究震后松弛，特别是在整个地震周期的日本海沟的地球动力学的背景下。
Crustal deformation after the 2011 Tohoku earthquake illuminates the complex interplay between transient mantle flow and afterslip. Modeling of postseismic deformation following great earthquakes has revealed the viscous structure of the mantle and the frictional properties of the fault interface. However, for giant megathrust events, viscoelastic flow and afterslip mechanically interplay with each other during the postseismic period. We explore the role of afterslip and viscoelastic relaxation and their interaction in the aftermath of the 2011 Mw (moment magnitude) 9.0 Tohoku earthquake based on a detailed model analysis of the postseismic deformation with laterally varying, experimentally constrained, rock rheology. Mechanical coupling between viscoelastic relaxation and afterslip notably modifies both the afterslip distribution and surface deformation. Thus, we highlight the importance of addressing mechanical coupling for long-term studies of postseismic relaxation, especially in the context of the geodynamics of the Japan trench across the seismic cycle.