Phase, Amplitude, and Polarization of Surface Waves and the Fine-Scale Structure of the Mantle

小行星9418063 本研究是为了改善目前的面波频散图的生成，通过增加振幅和极化数据的反演过程。 振幅和偏振依赖于相速度的横向梯度，因此限制了所得到的模型的短波长结构。 偏振数据对各向异性也很敏感，人们已经提出用长波长各向异性结构来解释异常表面波粒子运动。 这项工作将调查的范围内的理论和建议的模型，通过应用测量技术的耦合模式合成地震图计算模型具有不同程度的各向异性和短波长结构。 这些测试的结果将用于改进面波相位、极化和振幅数据的反演。 由此产生的观测约束的精细尺度和各向异性的结构，然后将包括在全球层析反演地幔结构。 *** ??

9418063 Masters This research is to improve the current generation of surface wave dispersion maps by adding amplitude and polarization data to the inversion process. Both amplitude and polarization depend on the lateral gradient of phase velocity and hence constrain the short wavelength structure of the resulting models. Polarization data are also sensitive to anisotropy, and long-wavelength anisotropic structures have already been proposed to explain anomalous surface-wave particle motions. This work will investigate the range of theories and proposed models by applying measurement techniques to coupled-mode synthetic seismograms computed for models with varying degrees of anisotropy and short-wavelength structure. The results of these tests will be used to improve inversions of surface-wave phase, polarization and amplitude data. The resulting observational constraints on the fine-scale and anisotropic structure will then be included in global tomographic inversions for mantle structure. *** ??