A line either side of which isostatic readjustment is uneven; the line separating uplift from subsidence (Sella et al. (2007) Geophys. Res. Letts. 34, L02306). In glaciology, it is the point where a glacier, reaching the coast, starts to float (Debenham (1965) Geo. J. 131, 3). Rignot et al. (1997) Science 276, 5314, refer to the hinge line as the limit of tidal flexing.
Subjects: Earth Sciences and Geography.