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- W2014242017 abstract "The 2D and 3D depth-migration algorithm, Phase-Shift Plus Interpolation (PSPI), has been modified to take anisotropy into account. The model used is a transversely isotropic (TI) medium with symmetry axis that can be either vertical or tilted. I first review the PSPI algorithm for isotropic media. For the TI model, the Christoffel equation gives velocity as a function of the propagation angle. Building tables linking the values of the different components of wavenumber allows us to circumvent direct inversion of the relationship between the components of the wavenumber and the propagation angle. With given values of and one can directly compute the value of and thus perform the phase-shift. Since the phase-shift occurs in the wavenumber-frequency domain, the modification of the code for TI media is quite straightforward and intuitive. The modification from a medium with vertical symmetry axis to layered media with varying orientation of symmetry axis is also painless. An example shows that, as with the conventional PSPI algorithm, lateral velocity variations can be taken into account; in addition, the algorithm honors lateral variations in the anisotropic coefficients as well." @default.
- W2014242017 created "2016-06-24" @default.
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- W2014242017 creator A5035972573 @default.
- W2014242017 date "1997-01-01" @default.
- W2014242017 modified "2023-09-24" @default.
- W2014242017 title "Depth migration in heterogeneous, transversely isotropic media with the phase‐shift‐plus‐interpolation method" @default.
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- W2014242017 doi "https://doi.org/10.1190/1.1885758" @default.
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