昆仑山口西M_S8.1地震INSAR斜距向同震位错分解  

INSAR Slant-Range Co-seismic Dislocation Decomposing of the M_S8.1 Earthquake in the West of Kunlun Mt. Pass

作　　者：马超[1] 单新建[1] 

机构地区：[1]中国地震局地质研究所地震动力学国家重点实验室

出　　处：《地震研究》2005年第3期244-247,共4页Journal of Seismological Research

基　　金：地震科学联合基金(102096);科技部社会公益研究专项(2002DIA10001)联合资助.

摘　　要：通过INSAR获得的地震同震形变场是地面像元相对卫星雷达波照射方向的视线向(或斜距向)变化量,INSAR视线向变化量分解为水平分量及垂直分量是多解的。为解决INSAR斜距向分解为水平位错及垂直位移的不唯一性,利用GPS定点的现场实测位移观测值,在昆仑山口西8.1级地震破裂带主断面上,建立起一种理论与实测相结合的INSAR斜距向位移分解方程,获得唯一解析解。该方法既保持了现场观测的真实性与精度优势,又利用了INSAR实时获取连续形变场的技术特点,通过一系列近似计算最终获得主破裂带上连续变化的水平及垂直同震形变曲线。The INSAR deformation field is a slant-range changing amount from microwave transmitter to ground pixels, and it needs to be decomposed into the horizontal and vertical displacement components. However, the decomposed results have multiple solutions. In order to solve this problem, we set up an equation for decomposing INSAR slant-range co-seismic dislocation by means of least square fitting based on the firsthand data observed at the GPS stations on the main rupture plane of the M_S8.1 earthquake in the west of Kunlun Mt. pass, and got the only solution. This method not only keeps the authenticity and precision of fieldwork but also makes good use of the INSAR technology. Through approaching the truth step by step, we got the co-seismic horizontal and vertical component curves continuously changing along the main rupture zone.

关 键 词：野外实测 INSAR 同震位错 最小二乘拟合 昆仑山口西MS8.1地震 

分 类 号：P315.725[天文地球—地震学]