Joint inversion of strong motion, teleseismic, geodetic, and tsunami datasets for the rupture process of the 2011 Tohoku earthquake
Joint inversion of strong motion, teleseismic, geodetic, and tsunami datasets for the rupture process of the 2011 Tohoku earthquake
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DOI：
10.1029/2011gl050098
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发表时间：
2011-04
影响因子：
5.2
通讯作者：
Y. Yokota;K. Koketsu;Y. Fujii;K. Satake;S. Sakai;M. Shinohara;T. Kanazawa
中科院分区：
文献类型：
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作者：
Y. Yokota;K. Koketsu;Y. Fujii;K. Satake;S. Sakai;M. Shinohara;T. Kanazawa
2011年的东北地震是由密集的强震、远震、大地测量和海啸网络观测到的。我们首先分别反演了由地震台网获得的每个数据集，用于地震的破裂过程。然后，我们执行棋盘分辨率测试，以评估这些数据集的分辨率。为了克服单独反演的有限分辨率和结果的差异，我们对所有这些数据进行了四次联合反演，以确定最适合解释所有数据集的源模型。在得到的震源模型中，最大同震滑动量约为35 m，计算总地震矩为4.2 × 1022 Nm，得到Mw = 9.0。主破裂不仅在走向方向上传播，而且在倾斜方向上传播，包括被称为宫城县的深层区域和靠近日本海沟的致密浅层区域。
The 2011 Tohoku earthquake was observed by dense strong motion, teleseismic, geodetic, and tsunami networks. We first inverted each of the datasets obtained by the networks separately, for the rupture process of the earthquake. We then performed checkerboard resolution tests for assessing the resolving power of these datasets. In order to overcome the limited resolutions of the separate inversions and differences in their results, we performed a quadruple joint inversion of all these data to determine a source model most suitable for explaining all the datasets. In the obtained source model, the maximum coseismic slip was approximately 35 m, and the total seismic moment was calculated to be 4.2 × 1022 Nm, which yielded Mw = 9.0. The main rupture propagated not only in the strike direction but also in the dip direction and included both the deep area called the Miyagi‐oki region and the compact shallow area near the Japan Trench.