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The non-hyperbolic equation introduced here is an approximation; therefore, I suggest it should
be used only as a way to obtain an initial constant value for the Vp/Vs ratio.
This ratio should be optimized later, using for example
an iterative velocity-analysis technique with wave-equation migration velocity analysis.
A future goal is to produce a -scan technique, similar to a velocity scan,
to obtain the best value. This final value will probably be a key element
for more advanced velocity analysis techniques.

Also, with the definition of a direct and more appropriate formulation for the PS travel time
with both P and S velocities, one tentative future step is to generate an inversion scheme to
estimate both P and S velocities from a single PS section.

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Stanford Exploration Project

10/23/2004