Abstract
This paper deals with theoretical aspects of wavefield decomposition
of Ocean Bottom Cable (OBC) data in the tau-p domain, considering
a horizontally layered medium. We present both the acoustic decomposition
and elastic decomposition procedures in a simple and compatible way.
Acoustic decomposition aims at estimating the primary upgoing P wavefield
just above the ocean-bottom, whereas elastic decomposition aims at
estimating the primary upgoing P and S wavefields just below the
ocean-bottom. Specific issues due to the interference phenomena at
the receiver level are considered. Our motivation is to introduce
the two-step decomposition scheme called 'receiver function' (RF)
decomposition that aims at determining the primary upgoing P and
S wavefields (RFP and RFS, free of any water layer multiples). We
show that elastic decomposition is a necessary step (acting as pre-conditioning)
before applying the multiple removal step by predictive deconvolution.
We show the applicability of our algorithm on a synthetic data example.
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