Resonance frequency of an orthotropic layer to non-principal vertically incident SH body and surface waves

In this study, non-principal waves propagating in an isotropic elastic half-space covered by an orthotropic layer are examined. The main objective is to establish a formula for the SH transfer function induced by an vertically incident SH wave and a formula for the H/V ratio of surface waves. The pe...

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Bibliographic Details
Published in:Journal of seismology 2023-08, Vol.27 (4), p.789-804
Main Authors: Dung, Truong Thi Thuy, Vinh, Pham Chi, Aoudia, Abdelkrim, Tuan, Tran Thanh
Format: Article
Language:English
Subjects:
Body waves
Earth and Environmental Science
Earth Sciences
Elastic half spaces
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
High impedance
Hydrogeology
Impedance
Nondestructive testing
Peak frequency
Rayleigh waves
Seismology
SH waves
Structural Geology
Surface waves
Transfer functions
Wave propagation
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Summary:In this study, non-principal waves propagating in an isotropic elastic half-space covered by an orthotropic layer are examined. The main objective is to establish a formula for the SH transfer function induced by an vertically incident SH wave and a formula for the H/V ratio of surface waves. The peak frequencies of both the SH transfer function and the H/V ratio curve are examined for models with low to high impedance contrasts to verify the applicability of the quarter wave-length rule for both SH body waves and surface waves. It is numerically shown that the quarter wave-length rule applies well for non-principal SH body wave. Non principal surface waves are shown to be a composition of Love and Rayleigh waves, and their peaks follow the quarter wave-length rule only in the case of high impedance contrast. For medium or low impedance contrasts, the peak frequencies of surface waves could differ from the peak frequencies of SH body wave with relative differences up to 50 % .
ISSN:1383-4649
1573-157X
DOI:10.1007/s10950-023-10152-w