## Calculation of geometrical spreading from gridded slowness vectors in 2-D

**Ludek Klimes**
### Summary

The paper is devoted to the numerical calculation
of the point-source geometrical spreading from gridded
travel times or slowness vectors in 2-D.
The geometrical spreading is obtained by finite
differencing the slowness vectors corresponding
to two different positions of a point source.
The slowness vectors may be calculated directly,
or as the finite-difference gradients of gridded travel times.

### Keywords

Paraxial ray approximation, travel times, geometrical spreading,
amplitudes, Green function.

### Whole paper

The
image of the paper in GIF 150dpi (598 kB)
is designed for an instant screen preview.

The paper is available in
PostScript (277 kB, colour figures)
and GZIPped PostScript (60 kB, colour figures).

In: Seismic Waves in Complex 3-D Structures, Report 10,
pp. 115-120, Dep. Geophys., Charles Univ., Prague, 2000.

SW3D
- main page of consortium ** Seismic Waves in Complex 3-D Structures **.