Crustal deformation across the Southern Patagonian Icefield observed by GNSS

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 vertic...

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Autores principales: Richter, Andreas Jorg, Ivins, Erik R., Lange, Heiner, Mendoza, Luciano Pedro Oscar, Schröder, Ludwig, Hormaechea, José Luis, Casassa, Gino, Marderwald, Eric Rodolfo, Fritsche, Mathias, Perdomo, Raúl Aníbal, Horwath, Martin, Dietrich, R.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Astronómicas
crustal deformation
glacial-isostatic adjustment
GNSS
Patagonia
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/159482
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-159482
record_format dspace
spelling I19-R120-10915-1594822023-10-27T20:30:54Z http://sedici.unlp.edu.ar/handle/10915/159482 Crustal deformation across the Southern Patagonian Icefield observed by GNSS Richter, Andreas Jorg Ivins, Erik R. Lange, Heiner Mendoza, Luciano Pedro Oscar Schröder, Ludwig Hormaechea, José Luis Casassa, Gino Marderwald, Eric Rodolfo Fritsche, Mathias Perdomo, Raúl Aníbal Horwath, Martin Dietrich, R. 2016 2023-10-27T14:51:33Z en Ciencias Astronómicas crustal deformation glacial-isostatic adjustment GNSS Patagonia 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 1.6.10¹⁸ and effects of lateral rheological heterogeneities. An analysis of the horizontal strain and strain-rate fields reveals some complex superposition, with compression dominating in the west and extension in the east. This deformation field suggests significant contributions from three processes: GIA, a western interseismic tectonic deformation field related to plate subduction, and an extensional strain-rate field related to active Patagonian slab window tectonics. Facultad de Ciencias Astronómicas y Geofísicas Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 206-215
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
crustal deformation
glacial-isostatic adjustment
GNSS
Patagonia
spellingShingle Ciencias Astronómicas
crustal deformation
glacial-isostatic adjustment
GNSS
Patagonia
Richter, Andreas Jorg
Ivins, Erik R.
Lange, Heiner
Mendoza, Luciano Pedro Oscar
Schröder, Ludwig
Hormaechea, José Luis
Casassa, Gino
Marderwald, Eric Rodolfo
Fritsche, Mathias
Perdomo, Raúl Aníbal
Horwath, Martin
Dietrich, R.
Crustal deformation across the Southern Patagonian Icefield observed by GNSS
topic_facet Ciencias Astronómicas
crustal deformation
glacial-isostatic adjustment
GNSS
Patagonia
description 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 1.6.10¹⁸ and effects of lateral rheological heterogeneities. An analysis of the horizontal strain and strain-rate fields reveals some complex superposition, with compression dominating in the west and extension in the east. This deformation field suggests significant contributions from three processes: GIA, a western interseismic tectonic deformation field related to plate subduction, and an extensional strain-rate field related to active Patagonian slab window tectonics.
format Articulo
Articulo
author Richter, Andreas Jorg
Ivins, Erik R.
Lange, Heiner
Mendoza, Luciano Pedro Oscar
Schröder, Ludwig
Hormaechea, José Luis
Casassa, Gino
Marderwald, Eric Rodolfo
Fritsche, Mathias
Perdomo, Raúl Aníbal
Horwath, Martin
Dietrich, R.
author_facet Richter, Andreas Jorg
Ivins, Erik R.
Lange, Heiner
Mendoza, Luciano Pedro Oscar
Schröder, Ludwig
Hormaechea, José Luis
Casassa, Gino
Marderwald, Eric Rodolfo
Fritsche, Mathias
Perdomo, Raúl Aníbal
Horwath, Martin
Dietrich, R.
author_sort Richter, Andreas Jorg
title Crustal deformation across the Southern Patagonian Icefield observed by GNSS
title_short Crustal deformation across the Southern Patagonian Icefield observed by GNSS
title_full Crustal deformation across the Southern Patagonian Icefield observed by GNSS
title_fullStr Crustal deformation across the Southern Patagonian Icefield observed by GNSS
title_full_unstemmed Crustal deformation across the Southern Patagonian Icefield observed by GNSS
title_sort crustal deformation across the southern patagonian icefield observed by gnss
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/159482
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