Accession Number : ADA194961

Title :   Finite-Difference Simulations of Rayleigh-Wave Scattering by Shallow Heterogeneity.

Descriptive Note : Scientific rept. no. 1, Feb 86-Feb 88,

Corporate Author : TELEDYNE GEOTECH ALEXANDRIA VA ALEXANDRIA LABS

Personal Author(s) : McLaughlin, Keith L ; Jih, Rong-Song

PDF Url : ADA194961

Report Date : Nov 1987

Pagination or Media Count : 114

Abstract : Rayleigh waves normally incident upon 2-D shallow heterogeneity are simulated by the linear finite-difference method to study attenuation, transmission, and reflection of Rayleigh waves and to measure the Rayleigh-to-P and -SV body wave conversion. Transmission, reflection, and scattering depend on the depth, average scale size of the heterogeneity and the amplitude of the spatial fluctuation of velocity. As expected, larger spatial variation in velocity attenuates Rayleigh waves more than smooth media and the attenuation is roughly proportional to the variance of the velocity fluctuation. The attenuation and scattering due to shallow heterogeneity is weaker than attenuation due to moderately rough topography. Keywords: Finite difference; Scattering; Rayleigh wave; Attenuation; Heterogeneity.

Descriptors :   *FINITE DIFFERENCE THEORY, *RAYLEIGH WAVES, *SCATTERING, *SEISMIC WAVES, ATTENUATION, CONVERSION, HETEROGENEITY, MEDIA, REFLECTION, ROUGHNESS, SCALE, SHALLOW DEPTH, SIMULATION, SIZES(DIMENSIONS), SPATIAL DISTRIBUTION, TOPOGRAPHY, VARIATIONS, VELOCITY, WAVES

Subject Categories : Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE