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    New acoustic approximation for transversely isotropic media with a vertical symmetry axis

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    Type
    Article
    Authors
    Xu, Shibo
    Stovas, Alexey
    Alkhalifah, Tariq Ali cc
    Mikada, Hitoshi
    KAUST Department
    Earth Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Seismic Wave Analysis Group
    Date
    2019-11-22
    Submitted Date
    2019-02-14
    Permanent link to this record
    http://hdl.handle.net/10754/667463
    
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    Abstract
    Seismic data processing in the elastic anisotropic model is complicated due to multiparameter dependency. Approximations to the P-wave kinematics are necessary for practical purposes. The acoustic approximation for P-waves in a transversely isotropic medium with a vertical symmetry axis (VTI) simplifies the description of wave propagation in elastic media, and as a result, it is widely adopted in seismic data processing and analysis. However, finite-difference implementations of that approximation are plagued with S-wave artifacts. Specifically, the resulting wavefield also includes artificial diamond-shaped S-waves resulting in a redundant signal for many applications that require pure P-wave data. To derive a totally S-wave-free acoustic approximation, we have developed a new acoustic approximation for pure P-waves that is totally free of S-wave artifacts in the homogeneous VTI model. To keep the S-wave velocity equal to zero, we formulate the vertical S-wave velocity to be a function of the model parameters, rather than setting it to zero. Then, the corresponding P-wave phase and group velocities for the new acoustic approximation are derived. For this new acoustic approximation, the kinematics is described by a new eikonal equation for pure P-wave propagation, which defines the new vertical slowness for the P-waves. The corresponding perturbation-based approximation for our new eikonal equation is used to compare the new equation with the original acoustic eikonal. The accuracy of our new P-wave acoustic approximation is tested on numerical examples for homogeneous and multilayered VTI models. We find that the accuracy of our new acoustic approximation is as good as the original one for the phase velocity, group velocity, and the kinematic parameters such as vertical slowness, traveltime, and relative geometric spreading. Therefore, the S-wave-free acoustic approximation could be further applied in seismic processing that requires pure P-wave data.
    Citation
    Xu, S., Stovas, A., Alkhalifah, T., & Mikada, H. (2019). New acoustic approximation for transversely isotropic media with a vertical symmetry axis. GEOPHYSICS, 85(1), C1–C12. doi:10.1190/geo2019-0100.1
    Sponsors
    We would like to thank editor J. Shragge, associate editor S. Hestholm; reviewers I. Ravve, P. Golikov, U. Waheed; and three anonymous reviewers for their comments and helpful suggestions.
    Publisher
    Society of Exploration Geophysicists
    Journal
    GEOPHYSICS
    DOI
    10.1190/geo2019-0100.1
    Additional Links
    http://mr.crossref.org/iPage?doi=10.1190%2Fgeo2019-0100.1
    ae974a485f413a2113503eed53cd6c53
    10.1190/geo2019-0100.1
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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