Surface, guided and interface waves

A thin layer surface inhomogeneity consisting of small, evenly distributed rigid bodies is perfectly bonded to an elastic half space. Constant normal and shear line loads are applied to the layer and the dynamic surface response is calculated by Laplace transform techniques. The product of the layer thickness and the rigid body/half-space mass densities proves to be a critical parameter in determining the response. It is found that the layer has a noticeable effect on the half-space surface response in relation to the free-surface behavior. In particular, while no standard surface-interface waves exist, evidence for small values of the critical parameter indicates the presence of pseudo-Rayleigh waves similar to those found in fluid-solid interface analyses.

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Chapter 7 Interface waves

Wave Propagation in Layered Anisotropic Media - with Applications to Composites - North-Holland Series in Applied Mathematics and Mechanics ◽

10.1016/s0167-5931(06)80048-3 ◽

1995 ◽

pp. 93-101

Keyword(s):

Interface Waves

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Elastic-wave propagation in two evenly-welded quarter-spaces

Bulletin of the Seismological Society of America ◽

10.1785/bssa0610051119 ◽

1971 ◽

Vol 61 (5) ◽

pp. 1119-1152

Author(s):

Mario Ottaviani

Keyword(s):

Wave Propagation ◽

Elastic Wave ◽

Numerical Solutions ◽

Elastic Wave Propagation ◽

Seismic Modeling ◽

Interface Waves ◽

Surface And Interface ◽

Modeling Techniques ◽

Vertical Displacements ◽

Quarter Space

abstract This paper deals with elastic-wave propagation in two evenly-welded quarter-spaces. A compressional line source can be located at any point within either medium. The numerical solutions to this problem have been obtained by using the finite difference method. A computer program has been written to obtain synthetic seismograms of the horizontal and vertical displacements at all nodes of the superimposed grid, for the following cases: (a) elastic-wave propagation in a quarter-space, and (b) elastic-wave propagation in two quarter-spaces. Reflected, converted, transmitted, and diffracted phases are identified and interpreted. Surface and interface waves, originated at the corner by diffraction of the source pulse, are investigated as a function of the rigidity contrast and the velocity contrast between the two media and of the position of the source. Two-dimensional seismic modeling techniques have been used to provide a qualitative experimental verification of the numerical results.

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