ISSN:
1365-246X
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Geosciences
Notes:
A review of a number of asymptotic studies of the so called ‘non-geometrical’ phenomena in seismic wave propagation is presented. The results concerning high frequency asymptotics fall into two groups. Some phenomena are described by a slightly modified ray method or by considering higher order approximations. They are the much spoken of S*-waves, the effect of wave tunnelling through a higher velocity layer and the low frequency depolarization of P-, S-, Love and Rayleigh waves described by the first-order asymptotic approximation. Description of phenomena of the other group requires boundary layer techniques. These phenomena are: generation of S-waves by a pressure centre due to velocity and density gradients or due to weak anisotropy as well as depolarization at caustics and in penumbra.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-246X.1989.tb01698.x
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