AMPLITUDE COMPUTATION IN HETEROGENEOUS MEDIA BY RAY PERTURBATION-THEORY - A FINITE-ELEMENT APPROACH

被引：25

作者：

FARRA, V

机构：

[1] Laboratoire de Sismologie, Institut de Physique du Globe, Paris, 75252, 4 Place Jussieu

来源：

GEOPHYSICAL JOURNAL INTERNATIONAL | 1990年 / 103卷 / 02期

关键词：

3‐D ray tracing; Hamiltonian formulation; heterogeneity; hexagonal anisotropy; perturbation theory;

D O I：

10.1111/j.1365-246X.1990.tb01775.x

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The efficient determination of rays and paraxial rays is discussed for a heterogeneous isotropic medium. We propose a finite element approach in which the medium is divided into a set of elements with polynomial elastic parameter distributions. Using a perturbation approach, analytical expressions for rays, paraxial rays and traveltimes are obtained, as well as for the rotation angle of the shear wave polarization vectors. Extension of the method to media with hexagonal anisotropy is also shown. Examples of the calculation of rays, amplitudes and polarizations are presented. Copyright © 1990, Wiley Blackwell. All rights reserved

引用

页码：341 / 354

页数：14

共 44 条

[1] 3-DIMENSIONAL VELOCITY STRUCTURE AND HYPOCENTER DISTRIBUTION IN THE CAMPI-FLEGREI CALDERA, ITALY [J].