非均匀各向异性弹性波场正演

FORWARD SIMULATION OF ELASTIC WAVES FIELD IN INHOMOGENEOUS ANISOTROPIC MEDIUM

摘要:

推导了用于非均匀各向异性弹性波场正演的伪谱法基本公式.对特征值法边界修正方程进行了全面的理论推导,给出了二维和三维问题固体、流体的特征变量及各类边界修正方程.选用2个模型,模拟了2.5维弹性波场,对S波分裂的偏振图像和时间延迟作了较详细的分析.

关键词:弹性波;各向异性介质;伪谱法;特征变量

Abstract:

The basic formula of pseudo-spectral method are derived for simulating inhomogeneous anisotropic elastic waves field.The boundary modifying equations of characteristic variables method are derived thoroughly which have been presented by previous authors separately, and the explicit formula of 3D and 2D problems of solid and liquid media are given.2.5D elasticwave field of two models are simulated,moreover, the polarization and time delay of S wave splitting are discussed in detail.

Key words:Elastic wave;Anisotropic medium;Pseudo-spectral method;Characteristic variable