Ground deformation and gravity variations modelled from present-day ice thinning in the vicinity of glaciers
International audience 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 Green's function associated to the...
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ftunivnantes:oai:HAL:hal-00594427v1 2023-05-15T18:29:50+02:00 Ground deformation and gravity variations modelled from present-day ice thinning in the vicinity of glaciers Memin, Anthony Rogister, Y. Hinderer, J. Llubes, M. Berthier, E. Boy, J.-P. Institut de physique du globe de Strasbourg (IPGS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS) 2009-11-20 https://hal.science/hal-00594427 https://hal.science/hal-00594427/document https://hal.science/hal-00594427/file/PEER_stage2_10.1016%252Fj.jog.2009.09.006.pdf https://doi.org/10.1016/j.jog.2009.09.006 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jog.2009.09.006 hal-00594427 https://hal.science/hal-00594427 https://hal.science/hal-00594427/document https://hal.science/hal-00594427/file/PEER_stage2_10.1016%252Fj.jog.2009.09.006.pdf doi:10.1016/j.jog.2009.09.006 info:eu-repo/semantics/OpenAccess ISSN: 0264-3707 Journal of Geodynamics https://hal.science/hal-00594427 Journal of Geodynamics, 2009, 48 (3-5), pp.195. ⟨10.1016/j.jog.2009.09.006⟩ ground tilt gravity variations elastic deformations present-day ice thinning [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2009 ftunivnantes https://doi.org/10.1016/j.jog.2009.09.006 2023-02-08T00:44:03Z International audience 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 Green's 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 Green's functions for the vertical displacement (resp. horizontal displacement, elastic part of the tilt) agree to within 1% up to ∼400 m (resp. 2km, 5km) 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 1979-2003; 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-todate 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 Université de Nantes: HAL-UNIV-NANTES Svalbard Norway Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) Journal of Geodynamics 48 3-5 195 203 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
ground tilt gravity variations elastic deformations present-day ice thinning [SDU]Sciences of the Universe [physics] |
spellingShingle |
ground tilt gravity variations elastic deformations present-day ice thinning [SDU]Sciences of the Universe [physics] Memin, Anthony 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 |
ground tilt gravity variations elastic deformations present-day ice thinning [SDU]Sciences of the Universe [physics] |
description |
International audience 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 Green's 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 Green's functions for the vertical displacement (resp. horizontal displacement, elastic part of the tilt) agree to within 1% up to ∼400 m (resp. 2km, 5km) 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 1979-2003; 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-todate 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. |
author2 |
Institut de physique du globe de Strasbourg (IPGS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Memin, Anthony Rogister, Y. Hinderer, J. Llubes, M. Berthier, E. Boy, J.-P. |
author_facet |
Memin, Anthony Rogister, Y. Hinderer, J. Llubes, M. Berthier, E. Boy, J.-P. |
author_sort |
Memin, Anthony |
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 |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.science/hal-00594427 https://hal.science/hal-00594427/document https://hal.science/hal-00594427/file/PEER_stage2_10.1016%252Fj.jog.2009.09.006.pdf https://doi.org/10.1016/j.jog.2009.09.006 |
long_lat |
ENVELOPE(69.468,69.468,-49.461,-49.461) |
geographic |
Svalbard Norway Mont Blanc |
geographic_facet |
Svalbard Norway Mont Blanc |
genre |
Svalbard |
genre_facet |
Svalbard |
op_source |
ISSN: 0264-3707 Journal of Geodynamics https://hal.science/hal-00594427 Journal of Geodynamics, 2009, 48 (3-5), pp.195. ⟨10.1016/j.jog.2009.09.006⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jog.2009.09.006 hal-00594427 https://hal.science/hal-00594427 https://hal.science/hal-00594427/document https://hal.science/hal-00594427/file/PEER_stage2_10.1016%252Fj.jog.2009.09.006.pdf doi:10.1016/j.jog.2009.09.006 |
op_rights |
info:eu-repo/semantics/OpenAccess |
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 |
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1766213246471110656 |