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确定地震的发震要素,理解断裂带断层的活动性质及地震震源机制,对于潜在性的地震灾害分析预报工作具有重要意义.2016年1月21日门源地震发生后,众多学者对于该次地震的发震要素、震源机制为纯逆冲还是走滑兼逆冲等仍存在争议,因此本文利用两景Sentinel-1A影像,经D-In SAR技术处理得到2016年青海门源MW5.9地震的同震形变位移,通过两步法位错反演模型分析确定了门源地震的主要影响区域及断层的滑动分布,为其他广大科研人员的进一步深入研究提供参考.同震位移图显示此次地震造成了明显的地表形变,其中冷龙岭南侧距门源县城较远区域产生了LOS向最大同震抬升约为8 cm的近椭圆形变区域.反演结果显示门源地震发震断层为深度7.9 km、走向约130°、倾角约46°、滑动角约47°、断层最大滑动为约0.6 m的左旋逆冲断层.地震过程中,断层滑动分布标量地震矩约为1.02×10~(18)Nm,对应矩震级约为MW5.9.
Determining the seismogenic elements of the earthquake and understanding the active nature of the faults and the focal mechanism of the earthquakes are of great significance for the potential earthquake disaster prediction and prediction.After the Mengyuan earthquake on January 21, 2016, It is still controversial whether the source mechanism is pure thrusting or strike-slip and thrusting. Therefore, this paper uses the two-scene Sentinel-1A image to process the 2016 Menghai Menyuan MW5.9 earthquake by D-In SAR Coseismic deformation and displacement, the main influencing area of gate-source earthquake and the slip distribution of the fault are confirmed by the two-step dislocation inversion model, which provides reference for further research of other researchers. The coseismic displacement diagram shows that the earthquake Resulting in significant surface deformation, of which the southern Longling Ridge from the county source area far from the LOS uplift to the maximum coseismic uplift of about 8 cm near oval deformation area inversion results show that the source Seismic Seismic fault depth of 7.9 km to about 130 ° with a dip of about 46 ° and a sliding angle of about 47 ° with a maximum fault slip of about 0.6 m. During the earthquake, the scalar moment of fault slip distribution is about 1.02 × 10 ~ (18) Nm, the corresponding moment magnitude is about MW5.9.