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According to Ottolini 1982, the DSR equation for the
downward continuation of common midpoint slant stack is

| |
(2) |

where
The solution of equation (2) is
| |
(3) |

We can use this equation to obtain the wave extrapolation for constant
velocity. Velocity variations in depth are easily accommodated by
varying the velocity *v* with depth *z* in equation (3).

*2cm

**dum
**

Figure 1 Computational flow chart of prestack slant stack
migration with one-pass PSPI.

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Stanford Exploration Project

11/17/1997