4D monitoring processing focus on traveltime and amplitude variations in order to monitor subsurface properties evolution. Using source and receiver antennas with double beamforming (DBF) processing, we propose to separate waves with respect to 5 observables; time, source and receiver slownesses and source and receiver azimuths. From repeated acquisitions at the same location and after wave separation, we are able to monitor not only travel time and amplitude but also the source and receiver slownesses and azimuths of both body waves and surface waves. In a second step, a method is proposed to separate the variations observed at depth on a reflected body wave from the statics fluctuations occurring at the subsurface.


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