We present a stable definition of *R*=*ik*_{z} that includes the
causality and viscosity concepts in phase-shift migration; moreover,
this expression is valid
for any value of and *k*_{x}.

We implemented the damping factor in the
*R* definition, equation (12), such that there is
no loss of high frequency information. This redefinition
also presents the possibility of having different damping
factors in order to improve even more the quality of the final
image.

The fact that we use Muir recursion to develop
a stable *R* definition lets us have
control over the migration angle just as wavefield
migration does.

4/29/2001