Surface Wave-Propagation on a Laterally Heterogeneous Earth

横向非均质地球上的表面波传播

• 批准号: 9505677
• 负责人: Francis Dahlen
• 金额: $ 19.5万
• 依托单位: Princeton University
• 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: 1995-07-15 至 2000-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9505677&HistoricalAwards=false
• 关键词: Surface; Wave; Propagation; Laterally; Heterogeneous

9505677 DAHLEN This research is to study the propagation of fundamental and higher-mode surface waves in a laterally heterogeneous earth. Previous results will be extended to focus on higher-frequency surface waves, for which cross-branch coupling due to variations in crustal thickness and shorter scale-length variations in the upper mantle such as slabs, become more important. Work will continue with the development of a spline basis on the surface of a tesselated sphere to replace the widely-used spherical-harmonic representation of three-dimensional earth models. Such a local basis has a number of advantages, including the ability to vary the node spacing depending upon the coverage, and a dramatic improvement in the speed of surface-wave ray tracing due to the reduction in the number of evaluations required at each step. This research is a component of the Cooperative Studies of the Earth's Deep Interior program. ***

小行星9505677 本研究旨在探讨横向非均匀大地中，基阶与高阶面波之传播。 以前的结果将被扩展到专注于更高频率的表面波，其中交叉分支耦合由于地壳厚度的变化和较短的尺度长度的变化在上地幔，如板，变得更加重要。 将继续开展工作，在镶嵌球体表面开发样条基，以取代广泛使用的三维地球模型球谐表示法。 这种局部基具有许多优点，包括根据覆盖范围改变节点间距的能力，以及由于减少了每个步骤所需的评估次数而显著提高了表面波射线追踪的速度。 这项研究是地球深层内部合作研究计划的一个组成部分。 ***