| 地球自由振荡弹性简正模研究进展与展望 |
| |
| 作者姓名： | 栾威 申文斌 丁浩 |
| |
| 作者单位： | 武汉大学测绘学院地球物理大地测量研究所 |
| |
| 基金项目： | 国家自然科学基金资助项目(No.41631072,41721003,41974022,41874023);地球空间环境与大地测量教育部重点实验室测绘基础研究基金资助项目(No.17-02-04)。 |
| |
| 摘 要： | 在构建现代地球模型时,地球内部分层结构主要是根据地震波资料确定的;而地球内部密度及弹性参数,特别是地幔以下大尺度结构的密度分布,则主要是根据地球自由振荡的弹性简正模观测资料确定的.本文概述了地球自由振荡简正模本征值的求解理论和方法,介绍了球型和环型模态位移场表达式,讨论了地球自由振荡模态的衰减、分裂与耦合效应;总结了多线态分裂谱线探测和分裂参数估计的方法,综述了利用弹性简正模开展地震矩张量、地球三维非均匀性结构和内核超速旋转约束与反演研究的主要进展和存在的问题.最后作为展望,本文还讨论了地球自由振荡简正模的未来研究趋势.
|
| 关 键 词： | 弹性简正模 地球模型 模态分裂 反演问题 地球三维非均匀性结构 |
Progress and prospect of studies on elastic normal modes of Earth's free oscillation |
| |
| Authors: | Luan Wei Shen Wenbin Ding Hao |
| |
| Institution: | (Institute of Geophysical Geodesy,School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China) |
| |
| Abstract: | In constructing modern Earth model,Earth's interior layered structure is mainly determined according to seismic data;while the density and elastic parameters of the interior Earth,especially the large-scale structure of the density distribution below the mantle,are mainly determined according to the Earth's free oscillation observations.This paper summarizes the theories and methods of solving the eigenvalues of normal modes of Earth's free oscillation,introduces the expressions of the displacement fields in spheroidal and toroidal modes,and discusses attenuation,splitting and coupling effects of the free oscillation modes.In addition,this paper summarizes the methods of detecting the splitting spectral lines of multiplets and estimating the corresponding splitting parameters,and reviews the main progress and existing problems in researching the constraints and inversion of the seismic moment tensor,three-dimensional(3D)heterogeneous structure of the Earth and inner core's super rotation by using elastic normal modes.Finally,we discuss the future development trend in studying normal modes of Earth's free oscillation. |
| |
| Keywords: | elastic normal modes Earth model mode splitting inversion problems three-dimensional heterogeneous structure of the Earth |
| 本文献已被 维普 等数据库收录！ |
|
