Research on the Influence of Surface Wave Dispersion Curve in Anisotropic Viscoelastic Media

Surface-wave dispersion curve inversion of S-wave velocity structure is one of the primary methods for revealing near-surface structures. However, near-surface structures have large anisotropy and strong attenuation characteristics. Previous studies have investigated that surface anisotropy and sedi...

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Bibliographic Details
Published in:Journal of physics. Conference series 2024-11, Vol.2895 (1), p.12046
Main Authors: Zhang, Chengang, Li, Jing, Liu, Hui, Su, Ronghua
Format: Article
Language:English
Subjects:
Anisotropy
Dispersion curve analysis
Finite difference method
Parameter sensitivity
Phase velocity
Rayleigh waves
S waves
Sensitivity analysis
Surface waves
Two dimensional analysis
Viscoelasticity
Wave attenuation
Wave dispersion
Wave propagation
Wave velocity
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Summary:Surface-wave dispersion curve inversion of S-wave velocity structure is one of the primary methods for revealing near-surface structures. However, near-surface structures have large anisotropy and strong attenuation characteristics. Previous studies have investigated that surface anisotropy and sediment attenuation parameters significantly impact the extraction of dispersive information. Quantitatively assessing the sensitivity of different parameters can provide a reference for accurate inversion of S-wave velocity. In this abstract, we utilize a 2-D VTI viscoelastic finite-difference method to simulate the propagation characteristics and dispersion features of Rayleigh wave in anisotropic and viscoelastic media. Then, we use the typical synthetic model to analyze the sensitivity of Rayleigh wave dispersion curves to viscoelastic and anisotropic parameters. The conclusion is that the anisotropic and attenuation parameters cause significant changes in the surface-wave phase velocity, and the viscoelasticity can cause the amplitude attenuation of the Rayleigh wave. The sensitivity of dispersion curves to anisotropic parameters is greater than that of viscoelastic parameters.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2895/1/012046