Crustal deformation across the Southern Patagonian Icefield observed by GNSS
- Richter, Andreas Jorg
- Ivins, E.
- Lange, H.
- Mendoza, Luciano Pedro Oscar
- Schoder, L.
- Hormaechea, José Luis
- Casassa, G.
- Marderwald, Eric Rodolfo
- Fritsche, M.
- Perdomo, Raul Anibal
- Horwath, M.
- Dietrich, R.
DOIAbstract
Geodetic GNSS observations at 43 sites well distributed over the Southern Patagonian Icefield region yield site velocities with a mean accuracy of 1 mm/a and 6 mm/a for the horizontal and vertical components, respectively. These velocities are analyzed to reveal the magnitudes and patterns of vertical and horizontal present-day crustal deformation as well as their primary driving processes. The observed vertical velocities confirm a rapid uplift, with rates peaking at 41 mm/a, causally related to glacial-isostatic adjustment (GIA). They yield now an unambiguous preference between two competing GIA models. Remaining discrepancies between the preferred model and our observations point toward an effective upper mantle viscosity even lower than...
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