1. A method for deghosting seismic data related to a subsurface of a body of water, the method comprising: receiving data recorded with seismic detectors distributed along a streamer, the data being associated with waves travelling from the subsurface to the seismic detectors; applying with a processing apparatus a migration procedure to the data to determine a first dataset indicative of the subsurface; applying with the processing apparatus a mirror migration procedure to the data to determine a second dataset indicative of the subsurface; joint deconvoluting with the processing apparatus the first dataset and the second dataset for deghosting a reflectivity of the subsurface; and generating with the processing apparatus an image of the subsurface based on the deghosted reflectivity of the joint deconvoluting step.