Ground deformation and gravity variations modelled from present-day ice thinning in the vicinity of glaciers
The solid Earth deforms because of post-glacial rebound due to the viscous relaxation following the last deglaciation but also because of present-day elastic deformation induced by ice thinning. In this paper, we compute elastic loading Greens function associated to the tilt of the ground in the vic...
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Online Access: | https://doi.org/10.1016/j.jog.2009.09.006 http://ecite.utas.edu.au/79956 |
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ftunivtasecite:oai:ecite.utas.edu.au:79956 2023-05-15T18:29:50+02:00 Ground deformation and gravity variations modelled from present-day ice thinning in the vicinity of glaciers Memin, A Rogister, Y Hinderer, J Llubes, M Berthier, E Boy, J-P 2009 https://doi.org/10.1016/j.jog.2009.09.006 http://ecite.utas.edu.au/79956 en eng Pergamon-Elsevier Science Ltd http://dx.doi.org/10.1016/j.jog.2009.09.006 Memin, A and Rogister, Y and Hinderer, J and Llubes, M and Berthier, E and Boy, J-P, Ground deformation and gravity variations modelled from present-day ice thinning in the vicinity of glaciers, Journal of Geodynamics, 48, (3-5) pp. 195-203. ISSN 0264-3707 (2009) [Refereed Article] http://ecite.utas.edu.au/79956 Earth Sciences Geophysics Geodynamics Refereed Article PeerReviewed 2009 ftunivtasecite https://doi.org/10.1016/j.jog.2009.09.006 2019-12-13T21:45:21Z The solid Earth deforms because of post-glacial rebound due to the viscous relaxation following the last deglaciation but also because of present-day elastic deformation induced by ice thinning. In this paper, we compute elastic loading Greens function associated to the tilt of the ground in the vicinity of glaciers using a Love number formalism for a stratified non-rotating spherical Earth model. We compare this global approach with the plane approximation in terms of height, gravity and tilt changes as a function of the distance from the measurement point to the load. We find that Greens functions for the vertical displacement (resp. horizontal displacement, elastic part of the tilt) agree to within 1% up to ∼400 m (resp. 2 km, 5 km) from the glaciers. Two specific cases of ice thinning are considered: (1) the alpine glaciers of the Mont Blanc region (France) where ice-thickness variations are derived from differential digital elevation model analysis for the period 19792003; (2) the Svalbard (Norway) glaciers by considering the ice model SVAL. We show that the rates of ground tilt are well above the limit of detection of up-to-date long-base hydrostatic tiltmeters, which, if installed next to the glaciers, could be used to monitor the time evolution of ice thinning. We also show that the topography has a strong influence on the gravity variations near the glaciers. Article in Journal/Newspaper Svalbard eCite UTAS (University of Tasmania) Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) Norway Svalbard Journal of Geodynamics 48 3-5 195 203 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geophysics Geodynamics |
spellingShingle |
Earth Sciences Geophysics Geodynamics Memin, A Rogister, Y Hinderer, J Llubes, M Berthier, E Boy, J-P Ground deformation and gravity variations modelled from present-day ice thinning in the vicinity of glaciers |
topic_facet |
Earth Sciences Geophysics Geodynamics |
description |
The solid Earth deforms because of post-glacial rebound due to the viscous relaxation following the last deglaciation but also because of present-day elastic deformation induced by ice thinning. In this paper, we compute elastic loading Greens function associated to the tilt of the ground in the vicinity of glaciers using a Love number formalism for a stratified non-rotating spherical Earth model. We compare this global approach with the plane approximation in terms of height, gravity and tilt changes as a function of the distance from the measurement point to the load. We find that Greens functions for the vertical displacement (resp. horizontal displacement, elastic part of the tilt) agree to within 1% up to ∼400 m (resp. 2 km, 5 km) from the glaciers. Two specific cases of ice thinning are considered: (1) the alpine glaciers of the Mont Blanc region (France) where ice-thickness variations are derived from differential digital elevation model analysis for the period 19792003; (2) the Svalbard (Norway) glaciers by considering the ice model SVAL. We show that the rates of ground tilt are well above the limit of detection of up-to-date long-base hydrostatic tiltmeters, which, if installed next to the glaciers, could be used to monitor the time evolution of ice thinning. We also show that the topography has a strong influence on the gravity variations near the glaciers. |
format |
Article in Journal/Newspaper |
author |
Memin, A Rogister, Y Hinderer, J Llubes, M Berthier, E Boy, J-P |
author_facet |
Memin, A Rogister, Y Hinderer, J Llubes, M Berthier, E Boy, J-P |
author_sort |
Memin, A |
title |
Ground deformation and gravity variations modelled from present-day ice thinning in the vicinity of glaciers |
title_short |
Ground deformation and gravity variations modelled from present-day ice thinning in the vicinity of glaciers |
title_full |
Ground deformation and gravity variations modelled from present-day ice thinning in the vicinity of glaciers |
title_fullStr |
Ground deformation and gravity variations modelled from present-day ice thinning in the vicinity of glaciers |
title_full_unstemmed |
Ground deformation and gravity variations modelled from present-day ice thinning in the vicinity of glaciers |
title_sort |
ground deformation and gravity variations modelled from present-day ice thinning in the vicinity of glaciers |
publisher |
Pergamon-Elsevier Science Ltd |
publishDate |
2009 |
url |
https://doi.org/10.1016/j.jog.2009.09.006 http://ecite.utas.edu.au/79956 |
long_lat |
ENVELOPE(69.468,69.468,-49.461,-49.461) |
geographic |
Mont Blanc Norway Svalbard |
geographic_facet |
Mont Blanc Norway Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_relation |
http://dx.doi.org/10.1016/j.jog.2009.09.006 Memin, A and Rogister, Y and Hinderer, J and Llubes, M and Berthier, E and Boy, J-P, Ground deformation and gravity variations modelled from present-day ice thinning in the vicinity of glaciers, Journal of Geodynamics, 48, (3-5) pp. 195-203. ISSN 0264-3707 (2009) [Refereed Article] http://ecite.utas.edu.au/79956 |
op_doi |
https://doi.org/10.1016/j.jog.2009.09.006 |
container_title |
Journal of Geodynamics |
container_volume |
48 |
container_issue |
3-5 |
container_start_page |
195 |
op_container_end_page |
203 |
_version_ |
1766213245503275008 |