各向异性介质中弹性波传播特征的伪谱法模拟研究

Pseudospectral modeling for the characteristics of elastic waves propagating in anisotropic media

长春地质学院地球物理系, 长春130026

Changchun College of Geology, Changchua City, Intercode: 130026

本文首先研究了各向导性介质中弹性波动方程伪谱法求解的稳定性条件；然后应用伪谱法模拟研究了各向异性介质中三种常见震源(垂直力源、压力源和剪切源)的辐射特征和三种各向导性模型(PTL、EDA和正交介质)的波传播快照特征；最后模拟研究了力源作用于裂隙诱导各向导性介质时VSP记录的特征。所有这些工作表明用伪谱法研究各向异性介质中弹性波传播是有效的。与此同时, 我们也获得了一些各向异性介质中波传播的有益认识。

After establishing the stability conditions fot solving elastic wave equation of anisotropic media by pseudospectral method (PSM), this paper applies PSM to the study of the radiation patterns causcd by 3 widely-used sources (vertical force, presure, and shear forces ) and the characteristics of wave propagation in 3 anisotropic models (PTL, EDA, and orthorthombicanisotropy). The characteristics of VSP records associated with fissure-induced anisotropy are also disscussed. Results show that it is effective to study elastic wave propagation in anisotropic media using PSM. At the same time,some knowledge about wave propagation in anisotropic media have been obtained.