# Dictionary:Diodic moveout

With C-wave gathers the moveout will not be symmetric and the arrival time expression is^{[1]}

equation (5.2.5), Thomsen (2002).

The non-hyperbolic moveout coefficent tends to be small and may be ignored for large offsets. Nonhyperbolic moveout parameter tends to be positive.

The extra coefficient is defined by

Thus, the moveout equation involves odd as well as even powers of *x* (see Thomsen, 2002: **5**;1-2).

## References

- ↑ Thomsen, L. (2002), Understanding seismic anisotropy in exploration and exploitation, 2002 Distinguished Instructor Short Course, Distinguished Instructor Series, No. 5, Society of Exploration Geophysicists