Joint inversion of teleseismic and InSAR datasets for the rupture process of the 2010 Yushu, China, earthquake
Joint inversion of teleseismic and InSAR datasets for the rupture process of the 2010 Yushu, China, earthquake
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DOI：
10.5047/eps.2012.04.008
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
Y. Yokota;Y. Kawazoe;S. Yun;S. Oki;Y. Aoki;K. Koketsu
中科院分区：
文献类型：
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作者：
Y. Yokota;Y. Kawazoe;S. Yun;S. Oki;Y. Aoki;K. Koketsu
我们研究了2010年中国玉树地震的破裂过程，该地震发生在青藏高原东部。基于质心定位网格搜索、余震分布和干涉合成孔径雷达观测结果，我们首先建立了一个左旋走滑弯曲断层模型。然后，我们进行了联合反演的地震波形数据和干涉合成孔径雷达数据使用不同的破裂前缘速度。得到了地震矩为2.3 × 1019Nm（Mw ≥ 6.8）的最佳震源模型，其破裂速度略快于该地区地壳的剪切波速度。这种超剪切破裂速度导致玉树县城及其周边地区的严重破坏，该地区位于震源模型的破裂方向。该次地震的特征，如破裂传播浅、速度快等，可能代表了青藏高原东部构造活动的一种地震特征。
We have examined the rupture process of the 2010 Yushu, China, earthquake, which occurred in the eastern Tibetan plateau. Based on the results of centroid location grid searches, the aftershock distribution, and InSAR observations, we first constructed a left-lateral strike-slip bending fault model. We then carried out joint inversions of the teleseismic waveform data and InSAR data using various rupture front velocities. We obtained the optimum source model with a seismic moment of 2.3 × 1019 N m (Mw ∼ 6.8), where the rupture velocity was found to be slightly faster than the shear wave velocity of the crust in this region. This supershear rupture velocity resulted in severe damage in and around the county seat of Yushu, which is located in the forward rupture direction of the source model. The features of this event, such as the shallow and fast rupture propagation may represent a seismic feature of the tectonic activity in the eastern Tibetan plateau.