利用Sentinel-1A数据反演2016年青海门源M_W5.9地震的同震形变场及断层参数

发布时间：2018-05-15 10:13

本文选题：同震形变 + Sentinel-A　；参考：《地震》2017年03期

【摘要】：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。
[Abstract]:Based on the complex image of Sentinel-1A IW mode and the precise orbit data provided by ESA, the differential interferogram of ascending and descending orbit is obtained by removing the topographic phase of ASTER GDEM V2 data with 30m grid spacing. The minimum cost flow algorithm with mask is used to unwrap the differential interferogram to invert the deformation field of the falling orbit coseismic occurred in the M_W5.9 earthquake in Mengyuan, Qinghai on January 21, 2016, and the fault slip distribution of the earthquake is retrieved based on the elastic half-space rectangular dislocation model. The results show that the coseismic deformation field caused by the earthquake is about 30km long and 14km wide, and the epicenter is uplifted, which is the maximum deformation region. The maximum deformation of the radar line of sight is about 5 cm, and the maximum deformation in the direction of the descent radar is about 7 cm. The slip of the seismic fault is left-lateral strike-slip with a strike of 133.6 掳and a dip angle of 46.7 掳. The main slip is concentrated in the depth of 1~7km. The maximum slip is about 2.4 m, which is located at the depth of 4km, and the seismic moment obtained by inversion is 1.19 脳 1018 Nm, and the magnitude is MW 6.0.
【作者单位】：信息工程大学地理空间信息学院;中国地震局地震预测研究所;
【基金】：国家自然科学基金(41071296,41474010,41304002)
【分类号】：P315.7

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