## Born and ray-theory seismograms
in 2D heterogeneous isotropic models

**Libor Sachl**
### Summary

3D P-wave seismograms computed using the first-order ray-based
Born approximation in a 2D heterogeneous isotropic background
model with a 2D heterogeneous perturbation are presented.
The perturbed model contains 16 domains. We construct 16 partially
perturbed models, in which the distribution of elastic parameters
is the same as in the background model except for one domain where
the P-wave velocity is perturbed. The Born seismograms are compared
with the differences between the ray-theory seismograms computed
in the partially perturbed models, or the complete perturbed model,
and the background model. The seismograms are computed for
a set of receivers in order to see how the seismograms change.
The rays in the perturbed models are computed to be able to identify
the wavegroups in the seismograms. Similarly, the travel times
of the diffracted waves are computed and highlighted in the seismograms.
The differences between the Born and ray-theory seismograms are studied.

### Whole paper

The paper is available in
PDF (2137 kB).

In: Seismic Waves in Complex 3-D Structures, Report 22,
pp. 83-112, Dep. Geophys., Charles Univ., Prague, 2012.