Analysis of attenuation and dispersion of Rayleigh waves in viscoelastic media by finite-difference modeling

2018 ◽  
Vol 148 ◽  
pp. 115-126 ◽  
Author(s):  
Shichuan Yuan ◽  
Xianhai Song ◽  
Wei Cai ◽  
Ying Hu
Keyword(s):  
Finite Difference ◽  
Rayleigh Waves ◽  
Viscoelastic Media ◽  
Attenuation And Dispersion

Finite-difference modeling and characteristics analysis of Rayleigh waves in anisotropic-viscoelastic media

2018 ◽  
Vol 108 ◽  
pp. 46-57
Author(s):  
Shichuan Yuan ◽  
Xianhai Song ◽  
Xueqiang Zhang ◽  
Sutao Zhao ◽  
Peiqiang Zhao ◽  
...  
Keyword(s):  
Finite Difference ◽  
Rayleigh Waves ◽  
Viscoelastic Media ◽  
Characteristics Analysis

Finite-Difference Modeling and Characteristics Analysis of Love Waves in Anisotropic-Viscoelastic Media

2021 ◽  
Author(s):  
Shichuan Yuan ◽  
Zhenguo Zhang ◽  
Hengxin Ren ◽  
Wei Zhang ◽  
Xianhai Song ◽  
...  
Keyword(s):  
Finite Difference ◽  
Phase Velocity ◽  
Velocity Dispersion ◽  
Love Waves ◽  
Velocity Anisotropy ◽  
Viscoelastic Media ◽  
Phase Velocities ◽  
Phase Velocity Dispersion ◽  
Anisotropic Elastic ◽  
Attenuation Anisotropy

ABSTRACT In this study, the characteristics of Love waves in viscoelastic vertical transversely isotropic layered media are investigated by finite-difference numerical modeling. The accuracy of the modeling scheme is tested against the theoretical seismograms of isotropic-elastic and isotropic-viscoelastic media. The correctness of the modeling results is verified by the theoretical phase-velocity dispersion curves of Love waves in isotropic or anisotropic elastic or viscoelastic media. In two-layer half-space models, the effects of velocity anisotropy, viscoelasticity, and attenuation anisotropy of media on Love waves are studied in detail by comparing the modeling results obtained for anisotropic-elastic, isotropic-viscoelastic, and anisotropic-viscoelastic media with those obtained for isotropic-elastic media. Then, Love waves in three typical four-layer half-space models are simulated to further analyze the characteristics of Love waves in anisotropic-viscoelastic layered media. The results show that Love waves propagating in anisotropic-viscoelastic media are affected by both the anisotropy and viscoelasticity of media. The velocity anisotropy of media causes substantial changes in the values and distribution range of phase velocities of Love waves. The viscoelasticity of media leads to the amplitude attenuation and phase velocity dispersion of Love waves, and these effects increase with decreasing quality factors. The attenuation anisotropy of media indicates that the viscoelasticity degree of media is direction dependent. Comparisons of phase velocity ratios suggest that the change degree of Love-wave phase velocities due to viscoelasticity is much less than that caused by velocity anisotropy.

Finite-Difference Simulation of 3D Sonic Log for Multiscale Viscoelastic Media

2007 ◽  
Author(s):  
Galina V. Reshetova ◽  
Vladimr A. Tcheverda ◽  
Theodore E. Simos ◽  
George Psihoyios ◽  
Ch. Tsitouras
Keyword(s):  
Finite Difference ◽  
Viscoelastic Media ◽  
Sonic Log
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