Heterogeneous rheology controlled postseismic deformation of the 2011 Tohoku-Oki earthquake
Heterogeneous rheology controlled postseismic deformation of the 2011 Tohoku-Oki earthquake
复制标题
非均质流变控制 2011 年东北冲地震的震后变形
DOI：
10.1002/2016gl068113
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
and Y. Nakai
中科院分区：
文献类型：
--
作者：
Muto;J.;B. Shibazaki;T. Iinuma;Y. Ito;Y. Ohta;S. Miura;and Y. Nakai
利用二维有限元模型，再现了2011年东北冲地震的震后形变观测数据。我们的模型解释了岩石圈-软流圈边界和火山下方的薄弱地带，能够再现密集大地网观测到的震后变形中的小范围(<；20 公里)扰动，例如第四纪火山周围的局部下沉。反转后滑在俯冲板块界面主破裂区的下倾界面处有一个峰值，与物理预测一致。非均质流变学模型中的后滑和粘弹性松弛的组合很好地解释了观测结果，即使是在小范围内。
Using two‐dimensional finite element modeling, we reproduced the observed postseismic deformation of the 2011 Tohoku‐Oki earthquake. Our model, which accounts for the lithosphere‐asthenosphere boundary and weak zones beneath volcanoes, was able to reproduce small‐scale (<20 km) perturbations in postseismic deformation observed by the dense geodetic network, such as local subsidence around Quaternary volcanoes. The inverted afterslip has a peak at the downdip limit of the main rupture region on the subducting plate interface, consistent with physical predictions. The combination of afterslip and viscoelastic relaxation in a heterogeneous rheology model explains the observations well, even on small scales.