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利用Sentinel-1A卫星IW模式的升、降轨雷达复数影像,结合ESA提供的精密轨道数据进行干涉处理,根据30m格网间距ASTER GDEM V2数据去除地形相位获得升轨和降轨差分干涉图,采用带有掩膜的最小费用流算法解缠差分干涉图来反演2016年1月21日发生在青海门源M_W5.9地震的降轨同震形变场,并基于弹性半空间矩形位错模型反演该地震的断层滑动分布。结果表明:地震造成的同震形变场长约30km,宽约14km,震中呈现抬升,为形变极大值区,升轨雷达视线向最大形变量约为5cm,降轨雷达视线向最大形变量约为7cm;该地震断层滑动为左旋走滑,为走向133.6°、倾角46.7°的东北倾断层,主要滑动量集中在1~7km深度,最大滑动量约2.4m,位于4km的深度;反演得出的地震矩为1.19×1018 Nm,震级为M_W6.0。
Based on the Sentinel-1A satellite IW mode complex imaging of rising and falling radar, combined with the precision orbit data provided by ESA, the interference processing was performed. According to the ASTER GDEM V2 data of 30m grid spacing, the ascending and descending orbital differential interferograms were obtained. The mask-based least-cost-flow method is used to inverse the differential interference interferogram to retrieve the orbital coseismic deformation field occurred on January 21, 2016 in the M5.5 M5.0 Wenchuan earthquake in Qinghai Province. Based on the rectangular half-space rectangular dislocation model Show the fault slip distribution of the earthquake. The results show that the coseismic deformation caused by the earthquake is about 30km in length and 14km in width with the uplift of the epicenter. In the maximum deformation zone, the maximum deformation of the rising radar is about 5cm. The maximum deformation of the falling radar is about Is 7cm. The faulting slip is left-lateral strike-slip, which is a northeastern dip strike of 133.6 ° and an inclination of 46.7 °. The main slip is concentrated at a depth of 1 to 7 km with a maximum slip of about 2.4 m at a depth of 4 km. The seismic moment is 1.19 × 1018 Nm and the magnitude is M_W6.0.