An approximate analytical approach is presented for determining the attenuation, dispersion, and intensity of motion at depth associated with Love-type surface waves in an elastic layer bonded by Coulomb friction to an elastic half-space. It is found that the dispersion curves are only slightly affected by a small amount of slip at the interface, but that the level of attenuation in the system increases considerably with the amplitude of motion. The results for the frequency dependence of the attenuation in the system are in basic agreement with experimental data on the attenuation of Love waves in the Earth (Jackson, 1971). The results for the intensity of motion at depth indicate a deterioration of bonding at high frequencies.

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