Migration using correct
velocity model with triclinic anisotropy
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The migrated interface coincides nearly perfectly with
the interface in the model used to compute the recorded wave
field. These
migrated sections
may be used for comparison
with migrated sections calculated for inaccurate velocity models.
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We compare 8 individual migrated sections (out of 81)
in the model with non-inclined curved interface
and we observe asymmetry in migration
caused by triclinic anisotropy that is asymmetric.
Individual images
show apparent differences in the contributions
from the corresponding symmetric pairs. These distortions are stronger
with the greater distance from the middle profile line.
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Another effect of the triclinic asymmetry is the
shift of
the reflection points away from the vertical plane containing
the source-receiver line even for non-inclined interfaces.
This effect of the triclinic anisotropy is thus similar
to the effect of an inclined interface in an isotropic
medium.