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halfspace contribute to the solution only for large enough values of the
Poisson coefficient (a > 0.309). One of them corresponds to leaking modes
with the phase velocity less than the velocity of the longitudinal wave.
A similar wave with distinct dispersion may exists in the case where an
elastic halfspace is covered by a thin layer with lower velocities of elastic
waves. The thickness of a layer should be not too small in comparison
with the wave length.
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