where
are partial derivatives of
relative to .
We can rewrite equation (25) as
(26)
where denote partial derivative of coordinate
relative to coordinates and , respectively.
Equation (26) describes an algorithm in two steps
for angle-decomposition after time-shift imaging:
compute through a slant-stack in panels
(find a change in with respect to ),
then apply a correction using the migration slowness and
a function of the structural dips
.