1. Method to determine coherent events of a seismic image, comprising the following operating phases: a selection phase: of a segmentation criterion which is a function of a variable represented in the form of a seismic image such as the amplitude, contrast, gradient of a zone of the image to be qualified, of at least one sliding window on said zone and its characteristics (dimensions, overlapping rate, etc.), a hierarchical segmentation phase, for overlapping sliding window positions, comprising a segmentation of said zone into n regions and for each pixel referenced at least once by a segmentation boundary: the saving of the number of times for which the pixel is referenced by a segmentation boundary for each sliding window to which it belongs and the calculation of the ratio of this number by the maximum theoretical number of times that said pixel could be referenced, said ratio corresponding to the index ECI; the attribution for each segmentation boundary of a hierarchical level based on a calculation which is a function of a determined criterion such as the surface area of the boundary, so as to obtain the index EII; an attribution phase to the non-referenced pixels of an index value EI and EIC corresponding to a numeric or alphanumeric characteristic non-value. a phase for the determination of the coherent events of the image by thresholding the indices EII and ECI, i.e. by only selecting the referenced pixels of the zone corresponding to values less than or greater than a fixed threshold.