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- W2359921020 abstract "High resolution surface-wave tomography must overcome the high frequency approximation assumption of ray theory and take the finite frequency effects into account.In this paper,the authors present a method to compute 3-D finite frequency sensitive kernels for surface-waves.This method can directely compute the surface-wave eigenvalues and eigenfunctions for the layered spherical earth model and the Earth-flattening procedure to approximately compute surface-wave dispersion for this model is not needed.The authors compute the 3-D sensitive kernels for phase-delay,amplitude perturbation and group-delay and discuss the finite-frequency effects in surface-waves.The analysis reveals that the 3-D phase-delay sensitivity kernels for surface waves bear a great resemblance to frechet kernels for the 2-D body-wave traveltimes. This suggests the 2-D propagation nature of surface waves.As far as the phase speed data are concerned,the Fresnel zone method is proper for the inversion of low-frequency waves,while the ray theory is proper for the inversion of high-frequency waves.However,the finite-frequency method should be taken for the inversion of intermediate-frequency waves.The terms high and low are resolution-dependent.The group dispersion data are better for the inversion of the fine structure of the crust and the upper mantle.But the strong sidebands of the group-delay kernels may lead to unstability of the inversion." @default.
- W2359921020 created "2016-06-24" @default.
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- W2359921020 date "2007-01-01" @default.
- W2359921020 modified "2023-09-25" @default.
- W2359921020 title "The computation of 3-D finite-frequency sensitivity kernels for surface-waves" @default.
- W2359921020 hasPublicationYear "2007" @default.
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