程冬, 张永志, 王晓航, 韩鸣. 2019: 基于Sentinel-1A数据的2017年伊拉克哈莱卜杰MW7.3地震同震形变场分析及断层滑动分布反演. 地震学报, 41(4): 484-493. DOI: 10.11939/jass.20180113
引用本文: 程冬, 张永志, 王晓航, 韩鸣. 2019: 基于Sentinel-1A数据的2017年伊拉克哈莱卜杰MW7.3地震同震形变场分析及断层滑动分布反演. 地震学报, 41(4): 484-493. DOI: 10.11939/jass.20180113
Cheng Dong, Zhang Yongzhi, Wang Xiaohang, Han Ming. 2019: Coseismic deformation and fault slip inversion of the 2017 MW7.3 Halabjah, Iraq, earthquake based on Sentinel-1A data. Acta Seismologica Sinica, 41(4): 484-493. DOI: 10.11939/jass.20180113
Citation: Cheng Dong, Zhang Yongzhi, Wang Xiaohang, Han Ming. 2019: Coseismic deformation and fault slip inversion of the 2017 MW7.3 Halabjah, Iraq, earthquake based on Sentinel-1A data. Acta Seismologica Sinica, 41(4): 484-493. DOI: 10.11939/jass.20180113

基于Sentinel-1A数据的2017年伊拉克哈莱卜杰MW7.3地震同震形变场分析及断层滑动分布反演

Coseismic deformation and fault slip inversion of the 2017 MW7.3 Halabjah, Iraq, earthquake based on Sentinel-1A data

  • 摘要: 本文首先利用二轨法对欧洲空间局Sentinel-1A雷达卫星影像进行差分干涉处理,获取了覆盖2017年伊拉克哈莱卜杰(Halabjah)MW7.3地震震区的同震形变场,结果表明:哈莱卜杰地震造成的地表形变影响范围约为60 km×70 km,形变场基本沿扎格罗斯主前缘断层展布;形变场的西南盘呈现隆升趋势,最大视线向形变值为88 cm,东北盘呈现下降趋势,最大视线向形变值为37 cm;隆升形变值远大于沉降值,反映出发震断层以逆冲运动为主的特征。然后基于弹性半平面空间矩形位错模型,分别采用多峰值粒子群算法和最速下降法确定了发震断层的几何参数和滑动分布结果。反演结果显示发震断层以逆冲运动为主,兼少量右旋走滑运动,最大滑动量为3.34 m,释放的地震矩为1.68×1020 N·m (MW7.4),与地震学的研究结果一致。

     

    Abstract: In this study, firstly, based on Sentinel-1A radar satellite images of Europe Space Agency, the coseismic deformation field covering the whole 2017 MW7.3 Halabjah, Iraq, earthquake region was obtained by using two-pass interferometry technique. The result shows that the main deformation region caused by the Halabjah earthquake is about 60 km×70 km, which distributes along the Zagros main front fault. Uplift occurred in the southwestern part with 88 cm at most along the line of sight, while in the northeastern subsidence occurred with 37 cm at most along the line of sight, the displacement indicates that the seismogenic fault is characterized by thrusting movement. Then nonlinear multi-peak particle swarm optimization algorithm and linear steepest descent method with rectangular dislocation model in elastic half-space are used to estimate the fault geometric parameters and coseismic slip distribution. The inversion results suggest that the seismogenic fault is dominated by thrust movement with a little right-lateral strike-slip component, and the maximum slip is about 3.34 m. The seismic moment from inversion is 1.68×1020 N·m (MW7.4), which is consistent with the result of seismology.

     

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