GPS数据约束的昆仑Ms8．1地震断层的分段模型

A SECTIONALIZED FAULT MODEL OF KUNLUN Ms8.1 EARTHQUAKE IN CONSTRAINT OF GPS DATA

利用InSAR结果反演得到的多破裂断层模型,用GPS数据为约束,根据点位错理论,运用向前模拟的方法,通过修正部分震源参数,得到了新的昆仑Ms8.1断层模型。由该模型模拟得到的理论同震水平位移无论是在方向还是大小上,较之由以前的多破裂断层模型模拟得到的理论同震水平位移更符合GPS观测结果,整体上也与野外考察结果更接近。在此基础上,还给出了昆仑Ms8.1地震的同震垂直位移及重力变化。

It is founded that there are significant differences in the hypocentral parameters of the Kunlun Ms 8.1 earthquake in some present corresponding studies. This work is based on the multi-rupture segment superposition model obtained by the conversion from the InSar data. According to the point dislocation theory, some focal parameters have been reasonably modified by means of the inversion technique of forward simulation in constraint of the GPS measurements,thus a new model of the Kunlun Mountain MsS. 1 earthquake is obtained. As a result, the co -seismic horizontal deformation field, which is in better agreement with the GPS measurements and the field investigation results, has been deduced. Meanwhile, the co-seismic vertical deformation and gravity changes are given.