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Figure compares the impulse responses of the two-way wave equation,
the downward continuation and plane-wave migration in tilted coordinates.
Figure (a) is the impulse response of the two-way wave equation,
Figure (b) is the impulse response of downward continuation, and Figure (c) is
the impulse response of plane-wave migration in tilted coordinates.
In Figure (b), the small angle part of the wavefront is similar to
that of the two-way wave equation, while the high angle part of the wavefront
loses energy due to the overturned waves.
In Figure (c), there are no reflections or multiples, since
we still use the one-way wave-equation extrapolator, but the wave front of the direct arrival
mimics that of the two-way wave equation very well, even
at the high angle and with overturned waves.
**bpvelleft
**

Figure 3 The velocity model of the left salt body.

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Stanford Exploration Project

4/5/2006