P176 MULTICOMPONENT DATA ANALYSIS AND WAVE SEPARATION IN MARINE SEISMIC SURVEY X. DAGANY 1 2 J. MARS 1 and F. LUC 2 Abstract 1 1 Laboratoire des Images et des signaux BP 46 38402 Saint Martin d’Hères France 2 Thomson Marconi Sonar This paper presents a theoretical description of signals received by OBS components. After focusing on the principle of the wave propagation through a fluid-sediment interface we will give analytical expressions of the components recorded by the sensors. Firstly we focus on the downgoing waves propagating into the water column; direct and multiple waves. We use this results to