地震各向异性是地球内部形变场和动力学特征的重要指示。基于天然地震及环境噪声提取的面波信息是反演壳幔结构各向异性的重要途径。但是，传统面波波形数据反演各向异性特征均基于一维速度模型假设，且深度分辨率受方法自身特性的限制而显得不足。各向异性反演的分辨率和深度约束亟待深入研究。随着理论研究的深入和高性能计算能力的飞速发展，基于正演的面波波形数据的反演，为有效测试面波反演的各向异性深度分辨率提供了技术支撑。本项目拟在大型计算阵列上，数值模拟各向异性模型中地震面波的传播规律，研究相速度/群速度、Z/H比值、面波偏振方向特征。利用正演的面波波形数据，在伴随层析成像反演的目标函数中增加Z/H比值和偏振方向随方位角的变化信息，探讨不同深度各向异性参数的可探测性和分辨率。尝试利用川滇地区独特的构造活动性和已经积累的大量研究成果，利用实际资料验证面波反演各向异性的分辨率，为各向异性反演研究提供理论支撑。

Seismic anisotropy is a key indicator to the stress field and geodynamics of the Earth. Surface wave tomography from ambient noise and teleseismic events plays an important role in the inversion of seismic anisotropy. However, the traditional anisotropy inversion procedure from surface waveforms is based on one-dimension structure hypothesis. So the resolution is limited by the inversion from surface waveforms. Consequently, the resolution of seismic anisotropy inversion and depth constraints need improved. As the theory of waveform propagation in anisotropy medium has been developed and the high performance computing technique grows rapidly, numerical modeling and inversion of high frequency surface waves become practical. This project will modeling high frequency surface waveform propagating in an anisotropy medium on high performance computers. The forward modeling will allow us to study the characteristics of surface dispersion, Z/H ratio and polarization affected by anisotropy parameters. This project will improve the adjoint tomography method by simulate the multi-component Rayleigh waves and its Z/H ratios and polarization simultaneously. The comparison between the resultant model and the input model will allow us to study the resolution of anisotropy inversion from surface waves. The results could also lay constraints on the resolution of lithosphere and upper mantle imaging. This project will also apply adjoint tomography in Sichuan-Yunnan area by fitting the phase dispersion, Z/H ratio and polarization simultaneously, which could give a validation of the resolution of anisotropy inversion by using real data.