A fast algorithm for 3D azimuthally anisotropic velocity scan

Conclusions

We have introduced a fast algorithm for 3D, azimuthally aniso-tropic velocity scan. Our synthetic and field-data experiments show that the method can be orders of magnitude faster than the conventional velocity scan, especially for large-size data and dense parameter sampling.

To illustrate the idea, equation 3 was used throughout the paper. Applicability of the butterfly algorithm is not limited to this form of the moveout function, as long as the transform can be written in the form of equation 10.