Ice cap melting and low-viscosity crustal root explain the narrow geodetic uplift of the Western Alps
International audience More than 10 years of geodetic measurements demonstrate an uplift rate of 1–3 mm/yr of the high topography region of the Western Alps. By contrast, no significant horizontal motion has been detected. Two uplift mechanisms have been proposed: (1) the isostatic response to denud...
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ftunivantilles:oai:HAL:hal-01332757v1 2023-06-11T04:12:37+02:00 Ice cap melting and low-viscosity crustal root explain the narrow geodetic uplift of the Western Alps Chery, Jean Genti, Manon Vernant, Philippe Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) 2016-04-16 https://hal.science/hal-01332757 https://hal.science/hal-01332757/document https://hal.science/hal-01332757/file/2016GL067821.pdf https://doi.org/10.1002/2016GL067821 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1002/2016GL067821 hal-01332757 https://hal.science/hal-01332757 https://hal.science/hal-01332757/document https://hal.science/hal-01332757/file/2016GL067821.pdf doi:10.1002/2016GL067821 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-01332757 Geophysical Research Letters, 2016, 43 (7), pp.3193-3200. ⟨10.1002/2016GL067821⟩ western Alps [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2016 ftunivantilles https://doi.org/10.1002/2016GL067821 2023-05-29T16:17:49Z International audience More than 10 years of geodetic measurements demonstrate an uplift rate of 1–3 mm/yr of the high topography region of the Western Alps. By contrast, no significant horizontal motion has been detected. Two uplift mechanisms have been proposed: (1) the isostatic response to denudation responsible for only a fraction of the observed uplift and (2) the rebound induced by the Wurmian ice cap melting which predicts a broader uplifting region than the one evidenced by geodetic observations. Using a numerical model to fit the geodetic data, we show that a crustal viscosity contrast between the foreland and the central part of the Alps, the latter being weaker with a viscosity of 1021 Pa s, is needed. The vertical rates are enhanced if the strong uppermost mantle beneath the Moho is interrupted across the Alps, therefore allowing a weak vertical rheological anomaly over the entire lithosphere. Article in Journal/Newspaper Ice cap Université des Antilles (UAG): HAL Geophysical Research Letters 43 7 3193 3200 |
institution |
Open Polar |
collection |
Université des Antilles (UAG): HAL |
op_collection_id |
ftunivantilles |
language |
English |
topic |
western Alps [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
western Alps [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Chery, Jean Genti, Manon Vernant, Philippe Ice cap melting and low-viscosity crustal root explain the narrow geodetic uplift of the Western Alps |
topic_facet |
western Alps [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience More than 10 years of geodetic measurements demonstrate an uplift rate of 1–3 mm/yr of the high topography region of the Western Alps. By contrast, no significant horizontal motion has been detected. Two uplift mechanisms have been proposed: (1) the isostatic response to denudation responsible for only a fraction of the observed uplift and (2) the rebound induced by the Wurmian ice cap melting which predicts a broader uplifting region than the one evidenced by geodetic observations. Using a numerical model to fit the geodetic data, we show that a crustal viscosity contrast between the foreland and the central part of the Alps, the latter being weaker with a viscosity of 1021 Pa s, is needed. The vertical rates are enhanced if the strong uppermost mantle beneath the Moho is interrupted across the Alps, therefore allowing a weak vertical rheological anomaly over the entire lithosphere. |
author2 |
Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) |
format |
Article in Journal/Newspaper |
author |
Chery, Jean Genti, Manon Vernant, Philippe |
author_facet |
Chery, Jean Genti, Manon Vernant, Philippe |
author_sort |
Chery, Jean |
title |
Ice cap melting and low-viscosity crustal root explain the narrow geodetic uplift of the Western Alps |
title_short |
Ice cap melting and low-viscosity crustal root explain the narrow geodetic uplift of the Western Alps |
title_full |
Ice cap melting and low-viscosity crustal root explain the narrow geodetic uplift of the Western Alps |
title_fullStr |
Ice cap melting and low-viscosity crustal root explain the narrow geodetic uplift of the Western Alps |
title_full_unstemmed |
Ice cap melting and low-viscosity crustal root explain the narrow geodetic uplift of the Western Alps |
title_sort |
ice cap melting and low-viscosity crustal root explain the narrow geodetic uplift of the western alps |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-01332757 https://hal.science/hal-01332757/document https://hal.science/hal-01332757/file/2016GL067821.pdf https://doi.org/10.1002/2016GL067821 |
genre |
Ice cap |
genre_facet |
Ice cap |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-01332757 Geophysical Research Letters, 2016, 43 (7), pp.3193-3200. ⟨10.1002/2016GL067821⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2016GL067821 hal-01332757 https://hal.science/hal-01332757 https://hal.science/hal-01332757/document https://hal.science/hal-01332757/file/2016GL067821.pdf doi:10.1002/2016GL067821 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2016GL067821 |
container_title |
Geophysical Research Letters |
container_volume |
43 |
container_issue |
7 |
container_start_page |
3193 |
op_container_end_page |
3200 |
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1768388575368314880 |