Transmission and reflection of Rayleigh waves at a thin low velocity vertical layer: A laboratory and theoretical study |
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| Authors: | P F Biagi T S Gegechkory E N Its P Manjgaladze V Sgrigna D Zilpimiani |
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| Institution: | (1) Dipartimento di Scienze della Terra, Università  La Sapienza , P. le A. Moro 2, I-00185 Roma, Italia;(2) Institute of Geophysics of the Academy of Sciences of Georgian SSR, Z. Ruckadze 1, Tbilisi, USSR;(3) Institute of Physics, Leningrad University, Petrodvoretz, Leningrad, USSR;(4) Dipartimento di Fisica, Università La Sapienza, P. le A. Moro 2, I-00185 Roma, Italia |
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| Abstract: | A three-dimensional ultrasonic modelling was used to study the Rayleigh waves reflected from a thin low velocity vertical layer and those transmitted through the same zone. The reflection and transmission coefficients of the Rayleigh waves have been calculated by an approximate method based on the Green function technique. Nonrigid contact boundary conditions were used for the low velocity layer modelling. A rather good correspondence between the theoretical and experimental absolute values of the reflection and the transmission coefficients was obtained. Some discrepancies between experimental and theoretical results, in particular with regard to phase shifts, may be explained by a certain inadequacy of the theoretical model to the low velocity layer investigated by the ultrasonic modelling. |
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| Keywords: | Low velocity vertical layer Rayleigh waves |
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