We want to find the moveout equation of a CSL at surface location *x*.
Suppose a reflector of dipping angle is located at (*x*_{t},*z*_{t});
then equation (11) gives the coordinates, (*x*,*z*), to which the
reflector is mapped after migration.
According to our assumption, the lateral change of the dipping angle around the
surface location *x* can be neglected. Let be the true depth of the
reflector at surface location *x*, then we have following relations:

1/13/1998