Wavefield separation into up- and down-going waves is a fundamental step of ocean-bottom data processing. It provides receiver-side multiple attenuation; source side multiples in general require further processing. In this paper we consider the up-down deconvolution method as a means to simultaneously eliminate both source-side and receiver-side multiples. In theory, this method is strictly valid for a horizontally layered earth only but we demonstrate analytically that if the seabottom is flat it is robust in the presence of structure. We present a real data application example of up-down deconvolution and we study the performance of the method in the presence of complex geology using a 2D synthetic model. Finally, we find that up-down deconvolution provides excellent results on this complex synthetic, in agreement with our theoretical derivation.


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