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  • Blackwell Publishing Ltd  (2)
  • 1985-1989  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Non-geometrical waves–are there any? An asymptotic description of some ‘non-geometrical’ phenomena in seismic wave propagation (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 99 (1989), S. 0 
    Details
    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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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A method of comparison of exact and asymptotic wave field computations (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 96 (1989), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Summary. A method of comparison of exact numerical computations with an asymptotic ray series expansion consisting of the two first terms is proposed. The method makes it unnecessary to derive complicated explicit expressions for the second leading term of the ray series.As a practical example we consider the anomalous PS arrival generated in the case of a near-vertical incidence of a spherical P wave on a solid/solid boundary. The areas in which the PS wave may be described by two leading terms of the ray series expansion are marked and deviations from the ray theory are analysed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1989.tb04449.x
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    Paper (German National Licenses)
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