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Since the amplitude of converted S-S waves ( *S*_{1}-*S*_{2} or *S*_{2}-*S*_{1} ) is
usually low we can use total energy in the X'-y' and Y'-x' sections
(the horizontal components on the rotated coordinate frame) as a
measure of the separation. This is the method that Alford(1986)
introduced; the reference frame of the source and receiver components
is rotated until the energy in the converted S-S wave sections is
minimized. The estimation can be performed on shot gathers or on
CMP-stacked data. If shot gathers are used the estimation can be
contaminated by noise and unwanted wavetypes (e.g. S-P waves) in the
horizontal component shot gathers. By stacking with a suitable S-wave
velocity function the S-wave signals are chosen in preference to other
arrivals. After suitable rotation angles have been estimated using the
stacked data, the rotation can be applied to the shot gathers in
preparation for the next stage of the separation algorithm, the P-S
wave separation.

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Stanford Exploration Project

12/18/1997