Conclusion

We describe a new anisotropic wavefield-extrapolation scheme. This new scheme uses an explicit anisotropic correction filter in addition to the normal isotropic extrapolation operator. It can extrapolate wavefields in a laterally varying TI medium with a symmetry axis. It is effective since it uses only the normal isotropic extrapolation operator in isotropic regions. The comparison of impulse responses shows that the new scheme is accurate for angles to almost $80^{\circ}$ in a homogeneous medium. More work is needed to test the scheme on complicated models.