Acoustic viscoelastic modeling by frequency-domain boundary element method
Earth medium is not completely elastic, with its viscosity resulting in attenuation and dispersion of seismic waves. Most viscoelastic numerical simulations are based on the finite-difference and finite-element methods. Targeted at viscoelastic numerical modeling for multilayered media, the constant...
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Published in | 地震学报:英文版 no. 2; pp. 97 - 105 |
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Main Author | |
Format | Journal Article |
Language | English |
Published |
2017
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Online Access | Get full text |
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Summary: | Earth medium is not completely elastic, with its viscosity resulting in attenuation and dispersion of seismic waves. Most viscoelastic numerical simulations are based on the finite-difference and finite-element methods. Targeted at viscoelastic numerical modeling for multilayered media, the constant-Q acoustic wave equation is transformed into the corresponding wave integral representation with its Green’s function accounting for viscoelastic coefficients. An efficient alternative for full-waveform solution to the integral equation is proposed in this article by extending conventional frequency-domain boundary element methods to viscoelastic media. The viscoelastic boundary element method enjoys a distinct characteristic of the explicit use of boundary continuity conditions of displacement and traction, leading to a semi-analytical solution with sufficient accuracy for simulating the viscoelastic effect across irregular interfaces. Numerical experiments to study the viscoelastic absorption of different Q values demonstrate the accuracy and applicability of the method. |
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Bibliography: | Xizhu Guan;Li-Yun Fu;Weijia Sun;Institute of Geology and Geophysics, Chinese Academy of Sciences;CNOOC Research Center 11-5695/P |
ISSN: | 1674-4519 1867-8777 |