Anisotropic velocity models
-
The dimensions of the velocity models and measurement
configurations are derived from the 2-D Marmousi model and dataset
(Versteeg & Grau, 1991). The horizontal dimensions of the velocity
model are 9.2 km x 10 km and the depth is 3 km.
The velocity model
is composed of two layers separated by one non-inclined curved
interface.
- The recorded wave field
is computed in velocity models composed of two layers with
the triclinic anisotropy (Mensch & Rasolofosaon, 1997)
with the rotation
of the tensor of elastic moduli in
the upper layer.
The angles of the rotation are 15, 30 and 45 degrees around
axis x1, x2
or x3.
The bottom layer is isotropic and the P-wave velocity is 3.6 km/s.
-
We migrate in
correct single-layer models
with triclinic anisotropy with the rotation of
the tensor of elastic moduli.
The distribution of elastic moduli in correct models corresponds
to the upper layer of the velocity models
in which the synthetic data have been calculated.
Additionally we migrate in
incorrect single-layer models
with triclinic anisotropy without
the rotation of the tensor of elastic moduli in order to simulate
situations in which we have made an incorrect guess of the anisotropic
velocity model for migration.