OBC technology provides information on both pressure and 3 components particle velocity recorded at the seafloor level, allowing complementary PP and PS imaging. In the following paper, we describe a new elastic decomposition scheme in the tau-p domain that separates upgoing-downgoing P and S wavefields and eliminates all water layer related multiples. We introduce frequency dependant operators to calibrate the geophones and to characterize the P wave reflection coefficient at the seafloor. The process does not require any a priori knowledge of seafloor parameters. We start by describing theoretical aspects for complete decomposition. Then, we detail a multi-step procedure for estimating the shear wave velocity at the seafloor, for extracting the upgoing S wavefield and finally for removing peg-leg arrivals. We show successful tests on a real dataset. The results suggest promising avenues for further processing.<br>


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