Wave-equation migration velocity analysis for VTI media using optimized implicit finite difference |

**Yunyue (Elita) Li**

Anisotropic wave-equation migration velocity analysis (WEMVA) requires fast and accurate wave
modeling at all angles. I use an optimized implicit finite difference one-way propagation engine
to improve both the efficiency and accuracy of this process. In this implicit finite difference scheme, anisotropic
parameters
and
are mapped into two finite difference coefficients,
and
.
When computing the perturbed wavefields from model perturbation, I apply a chain rule to link the
wave equation with the actual anisotropic parameters via the finite difference coefficients. I test
the implementation by impulse responses in both 2D and 3D. The sensitivity kernels for wave-equation
reflection tomography confirm the theoretical understanding that waves have a higher sensitivity
for
at large angles and a higher sensitivity for vertical velocity at small angles.

- Introduction
- Optimized implicit finite difference for VTI media
- Impulse response of the image-space wave-equation tomography operator
- Conclusions and discussions
- Bibliography
- About this document ...

Wave-equation migration velocity analysis for VTI media using optimized implicit finite difference |

2012-05-10