Glacial isostatic adjustment (GIA) describes the adjustment process of the earth to an equilibrium state when loaded by ice sheets. The ongoing adjustment of the earth's body to the redistribution of ice and water masses is evident in various phenomena, which have been studied to infer the extent and amount of the former ice masses, to reconstruct the sea level during a glacial cycle and to constrain rheological properties of the earth's interior.
https://www.gfz-potsdam.de/en/section/earth-system-modelling/topics/solid-earth-dynamics/glazial-isostatic-adjustment-gia/