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

表面波的相位、幅度和偏振以及地幔的精细结构

• 批准号: 9418063
• 负责人: T. Guy Masters
• 金额: $ 13.23万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-04-01 至 1998-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9418063&HistoricalAwards=false
• 关键词: Phase; Amplitude; Polarization; Surface; Waves

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. *** ??

本研究是通过在反演过程中加入振幅和极化数据来改进当前表面波频散图的生成。振幅和极化都取决于相速度的横向梯度，因此约束了所得到模型的短波结构。极化数据对各向异性也很敏感，长波各向异性结构已经被用来解释表面波粒子的异常运动。这项工作将通过将测量技术应用于计算具有不同程度各向异性和短波长结构的模型的耦合模式合成地震记录来研究理论和提出的模型的范围。这些试验的结果将用于改进面波相位、极化和振幅数据的反演。由此得到的对精细尺度和各向异性结构的观测约束将被纳入地幔结构的全球层析反演。* * * ? ?