基于形变场与地震波的芦山地震震源特征及发震机制研究

从目前芦山地震野外地质考察没有发现真正意义上的地震地表破裂带，以及地震震源机制研究结果差别较大、对发震机制认识不统一等科学问题入手。本项目拟采 用InSAR技术，获取芦山地震同震形变场，分析形变场空间分布特征，确定发震断层空间位置；利用形变观测资料（InSAR、GPS等）与远场地震波数据，开 展芦山地震震源破裂过程的联合反演研究，揭示芦山地震震源破裂过程、认识具有挤压性质的活动构造变形特征、震源过程，揭示发震断层的几何学和运 动学特征。在此基础上，结合余震重新定位、地质考察资料，开展库仑应力、模拟计算，分析芦山地震的孕震构造环境，分析周边断层应力相互作用，探讨芦山地震的发生机制；分析芦山地震与汶川地震的关系，以及芦山地震对周边断层的影响；依据这些研究，为未来地震危险性判定提供基础依据。

Currently there are some problems to solve, such as that the genuine surface rupture zone has not been found from current geological investigations, the research results of source mechanism of earthquakes have large difference from each other, the comprehension of earthquake-triggering mechanism is not unified. In order to solve these problems, the project intends to adopt InSAR technique to obtain the Lushan earthquake coseismic deformation，to analyse the spatial distribution characteristics of the deformation field，and to determine the spatial location of causative fault; we use the observed deformation data (InSAR, GPS, etc.) and far-field seismic waves data to carry out the joint inversion of Lushan earthquake rupture process ,in order to reveal the Lushan earthquake rupture process, to understand the compressional tectonic deformation and the rupture process ,and to reveal the geometric and kinematic characteristic of seismic fault . Based on this works, combining with the relocation of the aftershocks and geological investigation data, we can carry out the coulomb stress simulation and calculation,analyze the seismotectonic environment of Lushan earthquake and the interaction of peripheral fault stress, and then,discuss the mechanism of Lushan earthquake ; Analyze the relationship between Lushan earthquake and Wenchuan earthquake, and Lushan earthquake effects on the peripheral fault; Based on these studies, it can provide the fundamental basis for the judgement of seismic hazard in the future.