The video shows the processing sequence applied to the vertical component of the 3C VSP.

The VSP shows a strong attenuation of the down going wave field which can be compensated by a function of normalization in depth. In a VSP, the down going waves appear in the f,k domain with positive wave numbers and the up going waves with negative wave numbers. A wave number filter which preserves the positive wavenumbers has been applied to extract the down going waves and to facilitate the time picking of the first arrivals. The picked times are used to realize the flattening of both the down going wave field and the VSP data. A residual section is computed. It is the difference between the initial VSP data and the down going wave field. The residual section is then time shifted to put the up going wave field in two way time. The application of a median filter followed by a moving average filter is done to extract the up going waves. Deconvolution of up going waves by down going waves is done trace by trace in order to increase the vertical resolution of the VSP. A corridor is designed to select a part of the deconvolved and flattened up going waves.