Global Analyses of Body Wave Travel Times and Amplitudes: Whole-Mantle Tomography and Simulations of 3-D Wave Propagation

体波传播时间和振幅的全局分析：全地幔层析成像和 3D 波传播模拟

• 批准号: 0106666
• 负责人: Jeroen Tromp
• 金额: $ 15.6万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-07-15 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0106666&HistoricalAwards=false
• 关键词: Global; Analyses; Body; Wave; Travel

Abstract for proposal EAR0106666 (PH # 53x)Title: Global Analyses of Body Wave Travel Times and Amplitudes: Whole-mantle Tomography and Simulations of 3-D Wave PropagationPI's: Jeroen Tromp and Jeroen E. Ritsema, Cal TechSeismic tomographic models are beneficial to researchers from a wide variety of disciplines in the Earth Sciences. They provide images of the structure of oceanic and continental lithosphere, and play a central role in constraining the planform of convection in the mantle.To improve these models, we will construct new tomographic models in which we will take advantage of the extensive seismic data set that we have compiled in the past several years. It includes unique data types, such as higher-mode Rayleigh wave phase-velocity measurements and travel times of converted body-wave phases (e.g., SP, SKP), which have not been fully exploited in tomography.In a parallel research effort, we apply the new Spectral Element Method of Komatitsch and Tromp [1999] to study the effects of 3-D mantle structure on long-period body-wave propagation. Specifically, we will test the applicability of ray theory to wave propagation in `low-degree' seismic models, whether small-scale structure in the deep mantle, such as plumes, produce characteristic, observable travel-time or waveform variations, and whether the large-scale pattern of long-period body-wave amplitude anomalies can be explained by large-scale variation of seismic velocity in the mantle. These analyses provide insight into the quality of present-day tomographic models and help us design the next generation of tomographic inversions when fully 3-D forward theories can be incorporated.

提案EAR0106666（pH＃53X）摘要标题：身体波旅行时间和振幅的全球分析：3-D Wave Propagationpi的全神拟断层扫描和仿真：Jeroen Tromp和Jeroen E. Ritsema，Cal TechSeassicsicsic层造影模型对地球上各种各样的群体的研究人员都是有益的。它们提供了海洋和大陆岩石圈结构的图像，并在约束地幔中对流的平面形式中起着核心作用。为了改善这些模型，我们将构建新的层析成像模型，在这些模型中，我们将利用过去几年来汇编的广泛的地震数据集。 It includes unique data types, such as higher-mode Rayleigh wave phase-velocity measurements and travel times of converted body-wave phases (e.g., SP, SKP), which have not been fully exploited in tomography.In a parallel research effort, we apply the new Spectral Element Method of Komatitsch and Tromp [1999] to study the effects of 3-D mantle structure on long-period body-wave propagation.具体而言，我们将测试射线理论对“低度”地震模型中波传播的适用性，是否在深壁板中的小规模结构（例如羽毛，产生特征性的，可观察到的旅行时间或波浪变化），以及长期pperiod体波体波动势态的大规模模式是否可以通过大范围的范围来解释。这些分析提供了对当今断层扫描模型质量的见解，并帮助我们设计完整的3D前进理论时设计了下一代层析成像倒置。