Abstract
SUMMARY PP + PS = SS refers to a method introduced by Grechka and Tsvankin in 2002 that uses recordingsofPPandPS reflectionsbetweensourcesandreceiverstoestimatetheSS reflections between those same receivers. Using source–receiver seismic interferometry as a basis, we derive new, dynamically correct expressions relating reflected and converted P- and S-wave recordings to both P- and S-wave sources. We use these expressions to derive a generalized form of relationship between P and S waves, and show that the PP + PS = SS method of Grechka and co-workers is a special case of these new relationships. By considering the simple example of two elastic half-spaces, we illustrate the differences between the special case of PP + PS = SS and the generalized approach derived here. By relating the method to seismic interferometry, it is possible to see further applications of the new relationships in acquisition and processing of P and S waves, and also in the development of new imaging and inversion schemes.
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