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Title:: InSAR Coseismic Deformation Mechanism of Yunnan Mojiang M_S5.9 Earthquake in 2018

Author(s):: SUN He; LIU Chuanjjin; (The Second Monitoring and Application Center,China Earthquake Administration,Xi'an 710054,Shaanxi,China)

Keywords:: InSAR; Mojiang M_S5.9 earthquake; SDM; coseismic deformation; slip distribution

摘要:: 采用D-InSAR技术得到2018年云南墨江M_S5.9地震的同震形变场,以此为约束,利用SDM程序反演同震形变场和发震断层面的滑动分布,并讨论了此次地震的发震构造。结果表明:墨江地震造成地表LOS向最大形变量约为6 cm,同震形变场呈对称分布。发震断层以右旋走滑运动为主,符合区域构造的运动性质。断层面的最大滑动量为0.19 m,大约分布在沿断层走向10～13 km、且沿倾向向下3～6 km处。断层在近地表处滑动量较小,同震错动未破裂至地表。

Abstract:: Taking the coseismic deformation of Yunnan Mojiang M_S5.9 earthquake in 2018 obtained from D-InSAR technology as a constraint,we inversed the slip distribution of the fault plane along the region tectonic by the steepest descent method(SDM)and discussed the seismogenic structure of the earthquake. The results indicate that the maximum deformation in LOS-trending caused by the Mojiang earthquake is about 6 cm,and the distribution of co-seismic deformation field is symmetrical. The seismic fault is dominated by right-lateral slip,which is consistent with the dextral tectonic movement background of the regional tectonic. The largest slip achieves 0.19 m,which is distributed about 10～13 km along the fault strike and 3～6 km down along the dip direction. The slip of fault near surface is small,and the coseismic displacement does not break to the surface.