关键词: 各向异性, 弱粘弹性介质, 非均匀平面波, 摄动

Abstract:

After proposing a viewpoint that the perturbation of slowness and polarization is fully due to the inhomogeneous parameter D of inhomogeneous plane wave, the authors have improved the original perturbation formulas used by Cerveny and Psencik for the slowness and polarization of the inhomogeneous plane wave propagating in anisotropic weakly viscoelastic media, with new perturbation formulae for slowness and polarization, which are more concise than the previous and are exact for homogeneous wave. Numerical modeling for imaginary part of slowness Im(σ) and particle motion shows that the new perturbation formulae are better than the original ones for qP and qSV wave and have almost the same accuracy as the original for qSH wave.

Key words: anisotropy, weakly viscoelastic media, inhomogeneous plane wave, perturbation