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In the 3-D case, the wave equation corresponding to the ray-theoretic
interpretation of *all-angle* time migration is

| |
(11) |

in the 3-D time-retarded coordinate system
| |
(12) |

with the new time-like vertical coordinate ,
| |
(13) |

Following the same scheme as for the 2-D case and using equations
(12) and (13), we finally obtain the 3-D Eikonal
equation for time migration:

| |
(14) |

with
| |
(15) |

and

** Next:** Using the Eikonal equation
** Up:** USING 3-D EIKONAL EQUATION
** Previous:** USING 3-D EIKONAL EQUATION
Stanford Exploration Project

11/17/1997