Geodesic
Dispersion of non-stationary $SV$ Rayleigh waves near the surface of an inhomogeneous elastic body
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 18, Tome 173 (1988), pp. 172-179

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Formulas for the phase and group velocities of surface non-stationary Rayleigh $SV$ modes as functions of time and space coordinates are obtained. These formulas are deduced by using of double Fourier transformation and are in agree with the results in the stationary case. 
@article{ZNSL_1988_173_a17,
     author = {Z. A. Yanson},
     title = {Dispersion of non-stationary $SV$ {Rayleigh} waves near the surface of an inhomogeneous elastic body},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {172--179},
     publisher = {mathdoc},
     volume = {173},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1988_173_a17/}
}
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Z. A. Yanson. Dispersion of non-stationary $SV$ Rayleigh waves near the surface of an inhomogeneous elastic body. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 18, Tome 173 (1988), pp. 172-179. http://geodesic.mathdoc.fr/item/ZNSL_1988_173_a17/