In the implementation of TTI RTM, we meet stability problems and demands for speedup. Staggered Fourier first derivative and linear interpolation improves stability and accuracy. Areas with high gradients of the symmetry axis give rise to unstable numerical computations and make the wavefield blow up. Selective matching of anisotropy parameters helps to eliminate these areas. The acoustic TTI wave equation needs intensive computing. The finite difference method is more flexible than

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... ral method. However, the pseudo-spectral method gives a more accurate solution than the finite difference method. Efficiency can be improved by combining pseudo-spectral and finite difference methods. Figure 7. TTI RTM image of BPTTI synthetic data. 3224 SEG Denver 2010 Annual Meeting © 2010 SEG Downloaded 26 Oct 2010 to 192.160.56.254. Redistribution subject to SEG license or copyright; see Terms of Use at http://segdl.org/ EDITED REFERENCES Note: This reference list is a copy-edited version of the reference list submitted by the author. Reference lists for the 2010 SEG Technical Program Expanded Abstracts have been copy edited so that references provided with the online metadata for each paper will achieve a high degree of linking to cited sources that appear on the Web.