EGU22-5432, updated on 27 Mar 2022
https://doi.org/10.5194/egusphere-egu22-5432
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Simulation of pure qP-wave in vertical transversely isotropic media

Yi Zhang1, Luca De Siena2, and Boris Kaus3
Yi Zhang et al.
  • 1Johannes Gutenberg University of Mainz, Mainz Institute of Multiscale Modeling, Mainz, Germany (zhang9@outlook.de)
  • 2Johannes Gutenberg University of Mainz, Mainz Institute of Multiscale Modeling, Mainz, Germany (ldesiena@uni-mainz.de)
  • 3Johannes Gutenberg University of Mainz, Institute of Geosciences, Department of Chemistry, Pharmacy, Geography & Geosciences, Mainz, Germany (kaus@uni-mainz.de)

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.  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.

How to cite: Zhang, Y., De Siena, L., and Kaus, B.: Simulation of pure qP-wave in vertical transversely isotropic media, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-5432, https://doi.org/10.5194/egusphere-egu22-5432, 2022.

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