Physics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..745n&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 9, p. 745-748
Physics
6
Displacement, Rocks, Seismology, Sh Waves, Shear Properties, Solid-Solid Interfaces, Stiffness, Wave Propagation, Boundary Integral Method, Geology, Joints (Junctions), Velocity
Scientific paper
The effects of non-welded interfaces on guided SH-waves are examined analytically and numerically using the displacement-discontinuity model to describe the mechanical shear stiffnesses of the interfaces. A modal solution for guided SH-waves is developed for a layer in non-welded contact with underlying and overlying half-spaces. For low interface stiffnesses, the modal solution degenerates to the SH-plate wave solution and for high interface stiffnesses, to the Love channel wave solution. It is demonstrated that a single nonwelded interface separating two half-spaces is incapable of supporting an SH-interface wave. The effects of interface stiffness on the phase velocities and displacement profiles of guided SH-waves are examined for a low velocity layer in nonwelded contact with bounding half-spaces using the modal solution and a numerical boundary integral equation code. The results of this analysis demonstrate that the magnitude of the interface stiffness can have a first order effect on the velocities, amplitudes and displacement profiles of guided SH-waves in a low velocity layer which should make these waves highly detectable in crosshole seismic surveys.
Cook Neville G. W.
Myer Larry R.
Nihei Kurt T.
Yi Weidong
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