## 2.5-D approach in ray-based seismic wavefield modelling

**Johana Brokesova**
### Summary

The paper deals with a new and very promising method of
2.5-D high-frequency modelling of seismic wavefields.
The method consists in tracing 3-D rays through a 2-D structure
(not varying in one direction). The 2.5-D approach
is more efficient then 3-D modelling giving exactly the same results
with no additional approximation. Basic theory is briefly described
with the emphasis on certain differences and simplifications with
respect to the fully general 3-D computations. The method is
illustrated on one simple numerical example. A lot of possible applications
are suggested.

In: Seismic Waves in Complex 3-D Structures, Report 1, pp. 45-60,
Dep. Geophys., Charles Univ., Prague 1994.