Elastic wavefield directionality vectors |

The direction of energy propagation at every point in a wavefield propagated using an elastic finite-difference method can be deduced from the displacement vectors. The pressure-wave amplitude and displacements can be separated from the shear-wave amplitude and displacements using a separation operator. Amplitude separation can be used to create a more informative image by correctly imaging converted waves. Displacement separation enables calculation of the propagation direction, which can be used to create angle gathers without utilizing extended imaging conditions.

- Introduction
- Theoretical background
- Elastic wavefield modeling
- P-wave and S-wave amplitude separation and displacement decomposition
- P-wave and S-wave decomposition in the space domain
- Determination of polarity and its angle to the vertical direction
- From propagation angles-to-vertical to actual dip-angle gathers

- Propagation and decomposition results
- Basic elastic propagation test
- Polarization coefficient and displacement decomposition in the wavenumber and space domain
- Determination of polarization angle to the vertical

- Discussion and Conclusion
- Acknowledgements
- Bibliography
- About this document ...

2011-05-24