Effects on post-glacial rebound from the hard rheology in the transition zone
cited By 86 International audience We analyse the influences of a viscosity increase in the transition zone between 420 and 670 km on the geophysical signatures induced by post-glacial rebound, ranging from the perturbations in the Earth's rotation to the short wavelength features associated wi...
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ftinsu:oai:HAL:hal-02046599v1 2024-04-14T08:13:17+00:00 Effects on post-glacial rebound from the hard rheology in the transition zone Spada, G. Sabadini, R. Yuen, D.A. Ricard, Y. Dipartimento di Scienze Pure e Applicate (DiSPea) Università degli Studi di Urbino 'Carlo Bo' Dipartimento di Scienze della Terra "Ardito Desio" Università degli Studi di Milano = University of Milan (UNIMI) University of Minnesota Twin Cities (UMN) University of Minnesota System Department of Geology and Geophysics Minneapolis University of Minnesota System-University of Minnesota System Laboratoire de Sciences de la Terre (LST) École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 1992 https://hal.science/hal-02046599 https://hal.science/hal-02046599/document https://hal.science/hal-02046599/file/109-3-683.pdf en eng HAL CCSD Oxford University Press (OUP) hal-02046599 https://hal.science/hal-02046599 https://hal.science/hal-02046599/document https://hal.science/hal-02046599/file/109-3-683.pdf info:eu-repo/semantics/OpenAccess ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal.science/hal-02046599 Geophysical Journal International, 1992, 109 (3), pp.683-700 post-glacial rebound transition zone viscosity [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 1992 ftinsu 2024-03-21T17:18:05Z cited By 86 International audience We analyse the influences of a viscosity increase in the transition zone between 420 and 670 km on the geophysical signatures induced by post-glacial rebound, ranging from the perturbations in the Earth's rotation to the short wavelength features associated with the migration of the peripheral bulge. A self-gravitating model is adopted, consisting of an elastic lithosphere, a three-layer viscoelastic mantle and an inviscid core. The horizontal displacements and velocities and the stress pattern are extremely sensitive to the viscosity increase and to the chemical stratification of the transition zone. The hardening of the upper and the chemical density jumps in mantle below the 420 discontinuity induces a channel effect which contaminates the horizontal deformation both in the near-field and in the far-field from the ice-sheets. These findings indicate that intraplate geodetic data can be used to put bounds on the viscosity increase in the transition zone and on the amount of chemical stratification in the mantle. The stress field induced in the lithosphere by the Pleistocenic ice-sheet disintegration is a very sensitive function of mantle viscosity stratification. The existence of seismic activity along passive continental margins of previously glaciated areas requires a substantial viscosity increase in the mantle, with the viscosity of the transition zone acting as a controlling parameter. A viscously stratified mantle is responsible for a delayed upward migration of stress in the lithosphere which can account for the seismicity today. Copyright © 1992, Wiley Blackwell. All rights reserved Article in Journal/Newspaper Ice Sheet Institut national des sciences de l'Univers: HAL-INSU |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
post-glacial rebound transition zone viscosity [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
post-glacial rebound transition zone viscosity [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Spada, G. Sabadini, R. Yuen, D.A. Ricard, Y. Effects on post-glacial rebound from the hard rheology in the transition zone |
topic_facet |
post-glacial rebound transition zone viscosity [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
cited By 86 International audience We analyse the influences of a viscosity increase in the transition zone between 420 and 670 km on the geophysical signatures induced by post-glacial rebound, ranging from the perturbations in the Earth's rotation to the short wavelength features associated with the migration of the peripheral bulge. A self-gravitating model is adopted, consisting of an elastic lithosphere, a three-layer viscoelastic mantle and an inviscid core. The horizontal displacements and velocities and the stress pattern are extremely sensitive to the viscosity increase and to the chemical stratification of the transition zone. The hardening of the upper and the chemical density jumps in mantle below the 420 discontinuity induces a channel effect which contaminates the horizontal deformation both in the near-field and in the far-field from the ice-sheets. These findings indicate that intraplate geodetic data can be used to put bounds on the viscosity increase in the transition zone and on the amount of chemical stratification in the mantle. The stress field induced in the lithosphere by the Pleistocenic ice-sheet disintegration is a very sensitive function of mantle viscosity stratification. The existence of seismic activity along passive continental margins of previously glaciated areas requires a substantial viscosity increase in the mantle, with the viscosity of the transition zone acting as a controlling parameter. A viscously stratified mantle is responsible for a delayed upward migration of stress in the lithosphere which can account for the seismicity today. Copyright © 1992, Wiley Blackwell. All rights reserved |
author2 |
Dipartimento di Scienze Pure e Applicate (DiSPea) Università degli Studi di Urbino 'Carlo Bo' Dipartimento di Scienze della Terra "Ardito Desio" Università degli Studi di Milano = University of Milan (UNIMI) University of Minnesota Twin Cities (UMN) University of Minnesota System Department of Geology and Geophysics Minneapolis University of Minnesota System-University of Minnesota System Laboratoire de Sciences de la Terre (LST) École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Spada, G. Sabadini, R. Yuen, D.A. Ricard, Y. |
author_facet |
Spada, G. Sabadini, R. Yuen, D.A. Ricard, Y. |
author_sort |
Spada, G. |
title |
Effects on post-glacial rebound from the hard rheology in the transition zone |
title_short |
Effects on post-glacial rebound from the hard rheology in the transition zone |
title_full |
Effects on post-glacial rebound from the hard rheology in the transition zone |
title_fullStr |
Effects on post-glacial rebound from the hard rheology in the transition zone |
title_full_unstemmed |
Effects on post-glacial rebound from the hard rheology in the transition zone |
title_sort |
effects on post-glacial rebound from the hard rheology in the transition zone |
publisher |
HAL CCSD |
publishDate |
1992 |
url |
https://hal.science/hal-02046599 https://hal.science/hal-02046599/document https://hal.science/hal-02046599/file/109-3-683.pdf |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal.science/hal-02046599 Geophysical Journal International, 1992, 109 (3), pp.683-700 |
op_relation |
hal-02046599 https://hal.science/hal-02046599 https://hal.science/hal-02046599/document https://hal.science/hal-02046599/file/109-3-683.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1796311237397577728 |