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Dip filtering is conveniently incorporated
into the wave extrapolation equations.
Instead of initializing the Muir expansion
with we use
.(Recall from chapter that *r*_{0} is the cosine
of an exactly fitting angle).
For the 15 equation we have

| |
(6) |

For the 45 equation we have
| |
(7) |

Figures 5 and 6 show
hyperbolas of diffraction for
the 15 and 45 equations
with and without the dip filtering parameter .

**hyp15
**

Figure 5
Diffraction hyperbolas of the 15 equation
without dip filtering (left),
and with dip filtering (right).

**hyp45
**

Figure 6
Diffraction hyperbolas of the 45 equation
without dip filtering (left),
and with dip filtering (right).

** Next:** Gain control does dip
** Up:** COSMETIC ASPECT OF WAVE
** Previous:** Accentuating faults
Stanford Exploration Project

10/31/1997