but gravity measurements of ice-mass loss are  complicated by glacial isostatic adjustments—compensation for the rise or fall of the underlying crustal material.
but gravity measurements of ice-mass loss are  complicated by glacial isostatic adjustments—compensation for the rise or fall of the underlying crustal material.
post-glacial rebound:1
post-glacial rebound and isostatic depression are phases of glacial isostasy (glacial isostatic adjustment, glacioisostasy), the deformation of the earth's crust in response to changes in ice mass distribution.