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Artículo

Crustal deformation across the Southern Patagonian Icefield observed by GNSS

Richter, Andreas JorgIcon ; Ivins, E.; Lange, H.; Mendoza, Luciano Pedro OscarIcon ; Schoder, L.; Hormaechea, José LuisIcon ; Casassa, G.; Marderwald, Eric RodolfoIcon ; Fritsche, M.; Perdomo, Raul AnibalIcon ; Horwath, M.; Dietrich, R.
Fecha de publicación: 10/2016
Editorial: Elsevier Science
Revista: Earth and Planetary Science Letters
ISSN: 0012-821X
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Meteorología y Ciencias Atmosféricas

Resumen

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 Pas 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.
Palabras clave: Crustal Deformation , Glacial-Isostatic Adjustment , Gnss , Patagonia
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/54843
DOI: https://dx.doi.org/10.1016/j.epsl.2016.07.042
URL: https://www.sciencedirect.com/science/article/pii/S0012821X16303983
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Articulos(CCT - LA PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Citación
Richter, Andreas Jorg; Ivins, E.; Lange, H.; Mendoza, Luciano Pedro Oscar; Schoder, L.; et al.; Crustal deformation across the Southern Patagonian Icefield observed by GNSS; Elsevier Science; Earth and Planetary Science Letters; 452; 10-2016; 206-215
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