A-38 Processing with offset-vector-tile gathers Abstract Conventional prestack processing suffers from the absence of proper common-offset gathers in the crossed-array geometries. This requires an approach to prestack processing that recognizes the particular requirements of those geometries. This paper provides a strategy for prestack processing based on the construction of pseudo-minimal data sets (pMDSs) i.e. data sets which are as nearly as possible MDSs yet extend across the whole survey area. The strategy assumes 3D symmetric sampling of the input data. The most suitable pMDS in orthogonal geometry is a collection of offset-vector tiles (OVT gathers). Each OVT contains data with


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