## Kirchhoff prestack depth migration in simple orthorhombic
and triclinic models with differently rotated elasticity tensor:
comparison with zero-offset travel-time perturbations

**Vaclav Bucha**
### Summary

We use ray-based Kirchhoff prestack depth migration to calculate
migrated sections in simple anisotropic homogeneous velocity models
in order to demonstrate the impact of rotation of the tensor of
elastic moduli on migrated images. The recorded wave field is
generated in velocity models composed of two homogeneous layers
separated by a curved interface. The anisotropy of the upper layer
is orthorhombic or triclinic with the rotation of the tensor of
elastic moduli. We apply the Kirchhoff prestack depth migration to
single-layer velocity models with orthorhombic or triclinic anisotropy
with a differently rotated tensor of elastic moduli. We show and
discuss the errors of the migrated interface caused by incorrect
velocity models used for migration. The shifts of zero-offset migrated
interface caused by incorrect velocity models are estimated using
the linear travel-time perturbations and compared with migrated
images. The study is limited to P-waves.

### Keywords

3-D Kirchhoff prestack depth migration, anisotropic velocity model,
rotation of the tensor of elastic moduli, general elastic anisotropy,
orthorhombic anisotropy, triclinic anisotropy, travel-time
perturbations

### Whole paper

The paper is available in
PDF (2620 kB).

*Seismic Waves in Complex 3-D Structures*, **26** (2016), 81-102.