Simulation of pure qP-wave in vertical transversely isotropic media

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Abstract
<jats:p>&amp;lt;p&amp;gt;Acoustic wave equations are widely employed in wavefield extrapolation and inversion due to their simplicity compared to the elastic wave equations. In anisotropic media, qP- and qSV-waves are coupled. Multiple acoustic approximations in the vertical transversely isotropic (VTI) media have been proposed during the last decades. A classic way is to set the vertical S-wave velocity zero. As such, the S-wave artefacts still exist, whose amplitude increases with anisotropy. Setting S-wave velocity zero in all propagating directions tackles the issue. However, the higher-order spatial derivatives in the pure qP-wave equation make it hard to solve in the space domain. The spatial derivatives in the denominator of the pure qP-wave equation make the solution by the spatial-domain finite-difference unstable.&amp;amp;#160; In this study, we employed the time-domain pseudospectral method to solve both the classic acoustic wave equation and the pure qP-wave equation in VTI media. Hybrid absorbing boundary conditions are used. Both equations are applied to reverse time migration (RTM) for the anisotropic Marmousi model. The new qP-wave equation outperformed the classic qP-wave equation regarding the computational time. Further work can be extended to waveform inversion with the pure qP-wave equation.&amp;lt;/p&amp;gt;</jats:p>
Autoren
  • Yi Zhang
  • Luca De Siena
  • Boris Kaus
DOI
10.5194/egusphere-egu22-5432
Buchtitel
Copernicus GmbH
Datum der Veröffentlichung
2022
Status
Published
Herausgeber URL
http://dx.doi.org/10.5194/egusphere-egu22-5432
Datum der Datenerfassung
2022
Titel
Simulation of pure qP-wave in vertical transversely isotropic media

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