Seismic Wave Propagation on a Laterally Heterogenous Earth

地震波在横向非均质地球上的传播

• 批准号: 9725496
• 负责人: Francis Dahlen
• 金额: $ 52万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-04-01 至 2003-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725496&HistoricalAwards=false
• 关键词: Seismic; Wave; Propagation; Laterally; Heterogenous

9725496 Dahlen This research involves the development, testing, and exploitation of methods of inferring the lateral heterogeneity of the earth at intermediate scales, using 3-D Frechet kernels. Current instantaneous kernels will be extended to higher ray parameters by allowing for the coupling of more surface-wave overtone branches. Mode-ray duality will be explored by comparing coupled surface-wave kernels with kernels based upon body-wave JWKB theory. Three- dimensional kernels will be developed for wave-form functionals such as travel-time residuals measured by cross-correlation of observed and spherical-earth synthetic seismograms. Several other theoretical developments will be undertaken to implement the development of improved earth models from the greatly improved broad-band data sources such as the Global Seismic Network and the portable PASSCAL array projects. The improved earth models are essential to investigation of the driving forces of plate tectonics, the energy source for earthquakes. This research is a component of the National Earthquake Hazard Reduction Program. ***

小行星9725496 这项研究涉及的开发，测试和开发的方法推断地球的横向非均匀性在中间尺度，使用3-D弗雷歇内核。 目前的瞬时内核将扩展到更高的射线参数，允许耦合更多的表面波泛音分支。 模式射线的二重性将探讨比较耦合表面波内核与内核的基础上体波JWKB理论。 将为波形泛函开发三维内核，例如通过观测和球形地球合成地震记录的互相关测量的走时残差。 还将进行其他几项理论研究，以便利用全球地震网和便携式PASSCAL阵列项目等得到极大改进的宽带数据源，开发改进的地球模型。 改进的地球模型对于研究板块构造的驱动力--地震的能量来源是必不可少的。 这项研究是国家地震减灾计划的一个组成部分。 ***