InSAR数据约束的2022年1月8日青海门源MS6.9地震发震构造研究

利用Sentinel-1A卫星升降轨道数据和D-InSAR技术获得青海门源2022年1月8日M_S6.9地震的同震形变场，并基于弹性半空间位错模型反演其震源参数，利用分布滑动模型确定断层面上的滑动分布。结果表明，2022年1月8日青海门源地震的同震形变场沿NWW-SEE方向分布；断裂带南缘升轨影像和降轨影像最大视距分别为61 cm和62 cm,断裂带北缘升轨影像和降轨影像最大视距地表形变量分别为43 cm和56 cm。InSAR同震形变场断裂尺度模型断层长30 km,宽18 km,最大滑移量3.5 m;断层滑动分布模型表明该地震为左旋走滑地震。结合冷龙岭断裂的运动特征和几何特征，初步确定此次M_S6.9地震的发震断裂为冷龙岭断裂

Seismogenic structure of Menyuan, Qinghai MS6.9 earthquake on January 8, 2022 constrained by InSAR Data

This paper studied the deformation field and seismogenic structure of the Menyuan M_S6.9 earthquake in Qinghai Province on January 8, 2022, by using the ascending and descending Sentinel-1A data and the differential interferometric synthetic radar (D-InSAR) technique. The source parameters were then inverted to determine the fault geometry parameters and the non-uniform fault slip distribution with a dislocation model in an elastic half-space. The results showed that the coseismic deformation field of Menyuan earthquake is distributed along the NWW-SEE direction. The maximum surface deformation of the ascending and descending images on the southern edge of the fault zone are 61 cm and 62 cm, respectively; the maximum surface deformation of the ascending and descending images on the northern edge of the fault zone are 43 cm and 56 cm, respectively. The fault scale model of InSAR coseismic deformation field is 30 km long and 18 km wide, with the maximum slip of 3.5 m. Combined with the movement characteristics and geometric characteristics of Lenglongling fault, it is determined to be the seismogenic fault of Menyuan M_S6.9 earthquake.