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当由各向同性介质组成的薄互层各层的层厚均远小于地震波的波长时，薄互层会表现出等效横向各向同性。本文发展了横向各向同性介质中波传播的矩阵方法，并利用传播矩阵分别计算了波通过各向同性和等效横向各向同性介质的反射、透射理论地震图。通过比较两者计算的结果，认为对于会直或接近于垂直入射的情况下各向同性介质中的传播矩阵方法对薄互层仍然适用，同时也证实了薄互层的等效横向各向同性。对斜入射时，两者不完全相符。
When the thickness of the thin interlayers composed of isotropic media is much less than the wavelength of the seismic wave, the thin interlayers exhibit equivalent transverse isotropy. In this paper, the matrix method of wave propagation in transversely isotropic medium is developed and the waveforms of reflection and transmission of waves through isotropic and equivalent transversely isotropic media are calculated respectively by using the propagation matrix. By comparing the results of the two calculations, it is considered that the propagation matrix method in isotropic medium can still be applied to thin interlaminar layers for straight or near-normal incidence, and the equivalent transverse isotropy of thin interlaminar layers . For oblique incidence, the two do not exactly match.