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The propagation of shear waves differs between geo-media due to layer's structure and irregularity present in different layers. This paper studies the propagation of shear waves in a monoclinic layer with irregularity lying between two isotropic semiinfinite elastic medium. The displacement in the monoclinic layer is obtained by using perturbation technique. Then the dispersion relation is found in the assumed medium and is verified with the standard known results. Finally, effects of wave number and irregularity are studied numerically and the graphs are plotted for all cases. The dispersion curves for different size of irregularity are calculated and compared.

The present paper discusses the dispersion equation for SH waves in a monoclinic layer over a semi-infinite elastic medium with an irregularity. In the absence of the irregularity, the dispersion equation reduces to standard dispersion equation for SH waves in a monoclinic layer over an isotropic semi-infinite medium. The dispersion curves for different size of the irregularity are computed and compared for the halfspace without any irregularity. It can be seen that the phase velocity is strongly influenced by the wave number and the depth of the irregularity.