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This study presents a seismic geomorphological study of the basal contact between an extrusive volcanic sequence and underlying sediments, defining the \u2018Base Basalt\u2019 surface, on the Mid-Norwegian Margin. This contribution focuses in particular on the development of geomorphological features related to the rapid loading of a several 100 m-thick lava delta package of hyaloclastite onto poorly consolidated sediments of the pre-volcanic sedimentary basin fill. Seismic horizons, sequence boundaries, volcanic facies units and attribute maps are used to characterize the seismic geomorphological features imaged within a high-quality 3D seismic cube. The \u2018Base Basalt\u2019 horizon and attribute maps reveal incised channels and a network of polygonal to irregular depressions and ridges described here as an \u2018egg-box network\u2019. More than 150 depressions, with a typical diameter of 1 km and a depth of 100 m, have been mapped. The deformation features, which are restricted to the base of the Lava Delta seismic facies unit, are interpreted to be the result of rapid loading of the Lava Delta onto poorly consolidated unlithified pre-volcanic sediments. 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