利用欧空局提供的Sentinel-1A卫星差分干涉数据为约束,对2015-12-07塔吉克斯坦Ms7.4地震的震源机制进行反演.首先运用两轨法对卫星雷达影像进行差分干涉处理,获取覆盖塔吉克斯坦地震震区的同震形变场,然后运用分布式滑动模型反演获取较精细的断层滑动分布.结果显示,分布式滑动模型与观测结果有很高的拟合度.反演结果表明,发震断层以左旋走滑运动为主,此次地震断层的最大滑移量为4.42 m,同震的地震矩为73.71×1018 Nm,矩震级为Mw7.19,与震后USGS、GCMT、IPGP等机构给出的震源机制解结果一致,是在具有左旋走滑运动特征的显著构造背景下的一次正常、必然的破裂事件.%In this paper,we use InSAR data from the Sentinel-1A satellite to invert the focal mechanism solutions of the Ms7.4 earthquake,which occurred in Tajikistan on 7 December 2015.First,twopass interferometry technique is utilized to obtain the coseismic deformation of the region,covering the whole epicenter of the Tajikistan earthquake.Second,we utilize the distributed slip model inversion method to obtain a more precise distribution of fault slip by means of down-sampling the original observation data.The results indicates that inversion results are consistent with the observation data.In addition,the inversion results show that the seismogenic fault is dominated by sinistral strike-slip movement.The maximum slip of the earthquake fault is 4.42 m,and the coseismic seismic moment is about 73.71 × 1018 Nm (Mw7.19),which is consistent with the seismic research results available from USGS,GCMT,IPGP after this event.It also shows that this earthquake is a normal and inevitable rupture event in the significant tectonic setting with left-lateral strike-slip motion.
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