Synthetic Surface Wave Seismograms on a Laterally Heterogeneous Earth

横向非均质地球上的合成面波地震图

• 批准号: 9117699
• 负责人: Francis Dahlen
• 金额: $ 12.6万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-03-15 至 1994-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9117699&HistoricalAwards=false
• 关键词: Synthetic; Surface; Wave; Seismograms; Laterally

This research is to develop a better theory governing the propagation of Love and Rayleigh surface waves on a laterally heterogeneous earth model. The theory uses a slowly varying Lagrangian method to develop a JWKB theory that is then extended in a JWKB-Maslov manner to be valid near caustics, that is, near the source and antipode of the surface waves. Unlike other theories, this then will be applicable over the entire earth. The resulting computer program will be applied to the study of surface wave amplitude variations including geometric focusing and defocusing, laterally heterogeneous anelasticity, and earthquake source directivity. This research is a component of the National Earthquake Hazard Reduction Program.

本研究的目的是建立一个更好的理论来控制横向非均质地球模型上Love和Rayleigh表面波的传播。该理论使用缓慢变化的拉格朗日方法来发展JWKB理论，然后以JWKB-马斯洛夫方式扩展该理论，使其在焦散附近有效，即在表面波的源和对极附近。与其他理论不同，这将适用于整个地球。由此产生的计算机程序将应用于表面波振幅变化的研究，包括几何聚焦和散焦、横向非弹性和震源方向性。这项研究是国家减少地震危害计划的一个组成部分。