Papers by Victor Corchete
Bulletin of the Seismological Society of America
Most important features of the earth structure can be studied through the analysis of Rayleigh wa... more Most important features of the earth structure can be studied through the analysis of Rayleigh wave dispersion. This consists on its filtering and inversion to obtain shear wave velocity distribution with depth. I have applied this analysis to show lithospheric structure of South Iberia, by means of a set of 2D images of shear velocity for depths ranging from 1.5 to 46 km. The data used to obtain Rayleigh wave dispersion are the traces of 44 earthquakes, occurred on the neighbouring of Iberia. These earthquakes have been registered at 3 WWSSN stations located on Iberia. These stations have been considered because period range of best registration for WWSSN seismograph is the more suitable to explore the elastic structure of the Earth, for the depth range which is the objective of this study. I have proceeded to group all seismic events in source zones to obtain a dispersion curve for each path source-station. Dispersion curves are obtained by digital filtering with a combination of MFT and TVF filtering techniques. Thus, a set of source-station averaged dispersion curves was obtained.
Inversion of surface wave velocities in examples of multilayered anisotropic media is examined us... more Inversion of surface wave velocities in examples of multilayered anisotropic media is examined using an extension of the Smith-Dahlen formulation. Thus, surface wave propagation in a slightly anisotropic earth model has been found and the inversion of the azimuthal dependence of surface wave dispersion curves has been performed. The inversion scheme proposed in this paper has been verified by numerical matrix inversion with a computer programme in FORTRAN code. In two examples, hexagonal simmetry and 13 non zero canonical harmonic components, we have got results that show an excellent agreement between all phase velocities obtained for both Love and Rayleigh waves. We also perform two additional experiments with observed data, Love and Rayleigh waves phase velocities results of previous studies carry out in the Pacific . In these data test we also have a good agreement between observed and theoretical data.
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Papers by Victor Corchete