Fault Geometry and Slip Distribution of the 2010 Yushu Earthquakes Inferred from InSAR Measurement

Fault Geometry and Slip Distribution of the 2010 Yushu Earthquakes Inferred from InSAR Measurement
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InSAR测量推断2010年玉树地震断层几何及滑移分布

DOI:
10.1785/0120100192
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发表时间:
2011-08
影响因子:
3
通讯作者:
Rongshan Fu
Rongshan Fu
中科院分区:
地球科学3区
文献类型:
--
作者:
Xianjie Zha;Zhiyang Dai;Linlin Ge;Kui Zhang;Xiaojing Li;Xiaofei Chen;Zhenhong Li;Rongshan Fu

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本文利用上升路径(路径487)的ALOS/PALSAR数据,构建了2010年4月玉树地震的同震变形干涉图。然后利用相干图像推断玉树断层的运动轨迹,建立了玉树断层的5个断层模型。为了确定最适合同震干涉图的断层几何参数,我们采用了弹性位错算法。我们优选的断层模型由两条向东北倾斜的断层组成。一个走向~ N60°W,倾角82°;另一个走向~ N67°W,倾角为86°。最后,利用视线位移反演反演了玉树地震的同震滑动分布。结果表明,3个高滑移集中分布在5 ~ 8 km深度,在(96.93 E, 33.03 N)处最大滑移量为1.32 m。玉树断裂是一条左旋走滑断裂,北上倾滑分量较小。
We construct a coseismic deformation interferogram for the April 2010 Yushu earthquakes using ALOS/PALSAR data from the ascending track (path 487). We then infer the trace of the Yushu fault using the coherence image, and we build five fault models for the Yushu fault. To determine the fault geometry parameters that give the best fit to the coseismic interferogram, we apply an elastic dislocation algorithm. Our preferred fault model consists of two faults dipping to the northeast. One strikes ∼N60°W with a dip of 82°; the other strikes ∼N67°W with a dip of 86°. Lastly, we infer the coseismic slip distributions of the Yushu earthquakes by the inversion of the displacement in the line of sight (LOS). The results show that three high-slip concentrations are located at a depth of 5∼8 km, with a peak slip of 1.32 m at (96.93 E, 33.03 N). The Yushu fault is a left-lateral strike-slip faulting with small north-side-up, dip-slip components.
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