Modal sensitivity of rock glaciers to elastic changes from spectral seismic noise monitoring and modeling
International audience Among mountainous permafrost landforms, rock glaciers are mostly abundant in periglacial areas, as tongue-shapedheterogeneous bodies. Passive seismic monitoring systems have the potential to provide continuous recordings sensitive to hydro-mechanical parameters of the subsurfa...
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Online Access: | https://hal.science/hal-03026417 https://hal.science/hal-03026417/document https://hal.science/hal-03026417/file/GuillemotCryo2020.pdf https://doi.org/10.5194/tc-15-501-2021 |
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ftinsu:oai:HAL:hal-03026417v1 2024-04-28T08:23:54+00:00 Modal sensitivity of rock glaciers to elastic changes from spectral seismic noise monitoring and modeling Guillemot, Antoine Baillet, Laurent Garambois, Stephane Bodin, Xavier Helmstetter, Agnès Mayoraz, Raphaël Larose, Éric Institut des Sciences de la Terre (ISTerre) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA) Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) 2020 https://hal.science/hal-03026417 https://hal.science/hal-03026417/document https://hal.science/hal-03026417/file/GuillemotCryo2020.pdf https://doi.org/10.5194/tc-15-501-2021 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-15-501-2021 hal-03026417 https://hal.science/hal-03026417 https://hal.science/hal-03026417/document https://hal.science/hal-03026417/file/GuillemotCryo2020.pdf doi:10.5194/tc-15-501-2021 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-03026417 The Cryosphere, 2020, 15 (2), pp.501-529. ⟨10.5194/tc-15-501-2021⟩ https://tc.copernicus.org/preprints/tc-2020-195/ [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2020 ftinsu https://doi.org/10.5194/tc-15-501-2021 2024-04-05T00:39:09Z International audience Among mountainous permafrost landforms, rock glaciers are mostly abundant in periglacial areas, as tongue-shapedheterogeneous bodies. Passive seismic monitoring systems have the potential to provide continuous recordings sensitive to hydro-mechanical parameters of the subsurface. Two active rock glaciers located in the Alps (Gugla, Switzerland and Laurichard, France) have then been instrumented with seismic networks. Here, we analyse the spectral content of ambient noise, in order to study the modal sensitivity of rock glaciers, which is directly linked to elastic properties of the system. For both sites, we succeed in tracking and monitoring resonance frequencies of specific vibrating modes of the rock glaciers during several years. These frequencies show a seasonal pattern characterized by higher frequencies at the end of winters, and lower frequencies in hot periods. We interpret these variations as the effect of the seasonal freeze-thawing cycle on elastic properties of the medium. To assess this assumption, we model both rock glaciers in summer, using seismic velocities constrained by active seismic acquisitions, while bedrock depth is constrained by Ground Penetrating Radar surveys. The variations of elastic properties occurring in winter due to freezing were taken into account thanks to a three-phase Biot-Gassmann poroelastic model, where the rock glacier is considered as a mixture of a solid porous matrix and pores filled by water or ice. Assuming rock glaciers as vibrating structures, we numerically compute the modal response of such mechanical models by a finite- element method. The resulting modeled resonance frequencies fit well the measured ones along seasons, reinforcing the validity of our poroelastic approach. This seismic monitoring allows then a better understanding of location, intensity and timing of freeze-thawing cycles affecting rock glaciers. Article in Journal/Newspaper Ice permafrost The Cryosphere Institut national des sciences de l'Univers: HAL-INSU The Cryosphere 15 2 501 529 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Guillemot, Antoine Baillet, Laurent Garambois, Stephane Bodin, Xavier Helmstetter, Agnès Mayoraz, Raphaël Larose, Éric Modal sensitivity of rock glaciers to elastic changes from spectral seismic noise monitoring and modeling |
topic_facet |
[SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience Among mountainous permafrost landforms, rock glaciers are mostly abundant in periglacial areas, as tongue-shapedheterogeneous bodies. Passive seismic monitoring systems have the potential to provide continuous recordings sensitive to hydro-mechanical parameters of the subsurface. Two active rock glaciers located in the Alps (Gugla, Switzerland and Laurichard, France) have then been instrumented with seismic networks. Here, we analyse the spectral content of ambient noise, in order to study the modal sensitivity of rock glaciers, which is directly linked to elastic properties of the system. For both sites, we succeed in tracking and monitoring resonance frequencies of specific vibrating modes of the rock glaciers during several years. These frequencies show a seasonal pattern characterized by higher frequencies at the end of winters, and lower frequencies in hot periods. We interpret these variations as the effect of the seasonal freeze-thawing cycle on elastic properties of the medium. To assess this assumption, we model both rock glaciers in summer, using seismic velocities constrained by active seismic acquisitions, while bedrock depth is constrained by Ground Penetrating Radar surveys. The variations of elastic properties occurring in winter due to freezing were taken into account thanks to a three-phase Biot-Gassmann poroelastic model, where the rock glacier is considered as a mixture of a solid porous matrix and pores filled by water or ice. Assuming rock glaciers as vibrating structures, we numerically compute the modal response of such mechanical models by a finite- element method. The resulting modeled resonance frequencies fit well the measured ones along seasons, reinforcing the validity of our poroelastic approach. This seismic monitoring allows then a better understanding of location, intensity and timing of freeze-thawing cycles affecting rock glaciers. |
author2 |
Institut des Sciences de la Terre (ISTerre) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA) Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Guillemot, Antoine Baillet, Laurent Garambois, Stephane Bodin, Xavier Helmstetter, Agnès Mayoraz, Raphaël Larose, Éric |
author_facet |
Guillemot, Antoine Baillet, Laurent Garambois, Stephane Bodin, Xavier Helmstetter, Agnès Mayoraz, Raphaël Larose, Éric |
author_sort |
Guillemot, Antoine |
title |
Modal sensitivity of rock glaciers to elastic changes from spectral seismic noise monitoring and modeling |
title_short |
Modal sensitivity of rock glaciers to elastic changes from spectral seismic noise monitoring and modeling |
title_full |
Modal sensitivity of rock glaciers to elastic changes from spectral seismic noise monitoring and modeling |
title_fullStr |
Modal sensitivity of rock glaciers to elastic changes from spectral seismic noise monitoring and modeling |
title_full_unstemmed |
Modal sensitivity of rock glaciers to elastic changes from spectral seismic noise monitoring and modeling |
title_sort |
modal sensitivity of rock glaciers to elastic changes from spectral seismic noise monitoring and modeling |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-03026417 https://hal.science/hal-03026417/document https://hal.science/hal-03026417/file/GuillemotCryo2020.pdf https://doi.org/10.5194/tc-15-501-2021 |
genre |
Ice permafrost The Cryosphere |
genre_facet |
Ice permafrost The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.science/hal-03026417 The Cryosphere, 2020, 15 (2), pp.501-529. ⟨10.5194/tc-15-501-2021⟩ https://tc.copernicus.org/preprints/tc-2020-195/ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-15-501-2021 hal-03026417 https://hal.science/hal-03026417 https://hal.science/hal-03026417/document https://hal.science/hal-03026417/file/GuillemotCryo2020.pdf doi:10.5194/tc-15-501-2021 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-15-501-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
2 |
container_start_page |
501 |
op_container_end_page |
529 |
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1797584522566434816 |