基于2014年康定6.3级地震震后形变分析区域介质特征  

Regional Medium Characteristics Based on Post-Earthquake Deformation Analysis of Kangding Ms6.3 Earthquake in 2014

作　　者：刘艳慧 朱良玉[1] 季灵运[1] 徐晶[1] 张文婷 徐晓雪 LIU Yanhui;ZHU Liangyu;JI Lingyun;XU Jing;ZHANG Wenting;XU Xiaoxue(The Second Monitoring and Application Center,Xi’an 710054,China)

机构地区：[1]中国地震局第二监测中心,西安市710054

出　　处：《大地测量与地球动力学》2022年第6期559-564,共6页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震科技星火计划(XH20083);中国地震局第二监测中心科学技术基金(KJ202110107)。

摘　　要：以2014年康定6.3级地震震后InSAR形变资料为约束,采用三层粘弹性地震周期模型及遗传算法反演鲜水河断裂南东段的康定地震震区深部介质粘弹性层厚度及粘滞系数。最优拟合结果表明:1)该区域下地壳粘弹性层厚度为5 km,粘滞系数为9.9×10^(17)Pa·s,且断层两侧下地壳流变存在显著的横向不均一性。2)将断层两侧分别反演,显示断层南西盘下地壳粘滞系数(8.7×10^(17)Pa·s)略小于断层北东盘下地壳粘滞系数(1.2×10^(18)Pa·s)。We use InSAR deformation data after the 2014 Kangding Ms6.3 earthquake as constraints,and use the three-layer viscoelastic seismic period model and genetic algorithm to invert the viscoelastic layer thickness and viscosity coefficient of deep medium in the focal region of Kangding earthquake in the southeast section of Xianshuihe fault.The results show that:1)The thickness of the viscoelastic layer in the lower crust of Kangding area is 5 km,and the viscosity coefficient is 9.9×10^(17)Pa·s.The rheological properties of lower crust and lower mantle media on both sides of the fault have significant lateral heterogeneity.2)By inversion on both sides of the fault,the viscous coefficient of the lower crust of the southwest fault(8.7×10^(17)Pa·s)is slightly smaller than that of the northeast fault(1.2×10^(18)Pa·s).

关 键 词：康定地震 INSAR 震后形变 流变结构 下地壳流 

分 类 号：P315[天文地球—地震学]