Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argentieire, Mont Blanc, France)
International audience A passive seismic study was carried out underneath Glacier d'Argentiere, Mont Blanc, France, where an array of seismometers was installed in a subglacial access tunnel. The data show a very high emissivity from the glacier. Fracturing can be discriminated from serac falls...
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ftunigrenoble:oai:HAL:insu-00343887v1 2024-04-28T08:26:50+00:00 Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argentieire, Mont Blanc, France) Roux, P. Marsan, David Metaxian, J. P. O'Brien, G. Moreau, Luc Laboratoire de Géophysique Interne et Tectonophysique (LGIT) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Laboratoire Central des Ponts et Chaussées (LCPC)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) University College Dublin Dublin (UCD) 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) 2008 https://insu.hal.science/insu-00343887 https://insu.hal.science/insu-00343887/document https://insu.hal.science/insu-00343887/file/microseismic-activity-within-a-serac-zone-in-an-alpine-glacier-glacier-dargentiere-mont-blanc-france.pdf https://doi.org/10.3189/002214308784409053 en eng HAL CCSD International Glaciological Society info:eu-repo/semantics/altIdentifier/doi/10.3189/002214308784409053 insu-00343887 https://insu.hal.science/insu-00343887 https://insu.hal.science/insu-00343887/document https://insu.hal.science/insu-00343887/file/microseismic-activity-within-a-serac-zone-in-an-alpine-glacier-glacier-dargentiere-mont-blanc-france.pdf doi:10.3189/002214308784409053 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://insu.hal.science/insu-00343887 Journal of Glaciology, 2008, 54 (184), pp.157 -168. ⟨10.3189/002214308784409053⟩ ICEQUAKES CALIFORNIA EARTHQUAKES ICE ARRAY GEOMETRY BENEATH MOTION [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDE.ES]Environmental Sciences/Environment and Society info:eu-repo/semantics/article Journal articles 2008 ftunigrenoble https://doi.org/10.3189/002214308784409053 2024-04-18T03:12:00Z International audience A passive seismic study was carried out underneath Glacier d'Argentiere, Mont Blanc, France, where an array of seismometers was installed in a subglacial access tunnel. The data show a very high emissivity from the glacier. Fracturing can be discriminated from serac falls using the signal characteristics. We apply seismic array methods to locate the sources of these signals, using a two-step grid search in the parameter space. Four clusters of activity are found close to the network, showing that this fracturing does not take place uniformly over the glacier, but rather in isolated small zones. We compute a local magnitude using regional earthquakes for calibration. The magnitudes follow a classical Gutenberg-Richter law in the range M-L = -3 to 0.15, showing that no characteristic size events dominate the process. We suggest that those spatial clusters of icequakes could reveal the heterogeneous nature of the friction at the base of the glacier, with patches of high frictional stresses locally generating intense fracturing within the ice mass. Article in Journal/Newspaper Journal of Glaciology Université Grenoble Alpes: HAL Journal of Glaciology 54 184 157 168 |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
ICEQUAKES CALIFORNIA EARTHQUAKES ICE ARRAY GEOMETRY BENEATH MOTION [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDE.ES]Environmental Sciences/Environment and Society |
spellingShingle |
ICEQUAKES CALIFORNIA EARTHQUAKES ICE ARRAY GEOMETRY BENEATH MOTION [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDE.ES]Environmental Sciences/Environment and Society Roux, P. Marsan, David Metaxian, J. P. O'Brien, G. Moreau, Luc Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argentieire, Mont Blanc, France) |
topic_facet |
ICEQUAKES CALIFORNIA EARTHQUAKES ICE ARRAY GEOMETRY BENEATH MOTION [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDE.ES]Environmental Sciences/Environment and Society |
description |
International audience A passive seismic study was carried out underneath Glacier d'Argentiere, Mont Blanc, France, where an array of seismometers was installed in a subglacial access tunnel. The data show a very high emissivity from the glacier. Fracturing can be discriminated from serac falls using the signal characteristics. We apply seismic array methods to locate the sources of these signals, using a two-step grid search in the parameter space. Four clusters of activity are found close to the network, showing that this fracturing does not take place uniformly over the glacier, but rather in isolated small zones. We compute a local magnitude using regional earthquakes for calibration. The magnitudes follow a classical Gutenberg-Richter law in the range M-L = -3 to 0.15, showing that no characteristic size events dominate the process. We suggest that those spatial clusters of icequakes could reveal the heterogeneous nature of the friction at the base of the glacier, with patches of high frictional stresses locally generating intense fracturing within the ice mass. |
author2 |
Laboratoire de Géophysique Interne et Tectonophysique (LGIT) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Laboratoire Central des Ponts et Chaussées (LCPC)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS) University College Dublin Dublin (UCD) 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 |
Roux, P. Marsan, David Metaxian, J. P. O'Brien, G. Moreau, Luc |
author_facet |
Roux, P. Marsan, David Metaxian, J. P. O'Brien, G. Moreau, Luc |
author_sort |
Roux, P. |
title |
Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argentieire, Mont Blanc, France) |
title_short |
Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argentieire, Mont Blanc, France) |
title_full |
Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argentieire, Mont Blanc, France) |
title_fullStr |
Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argentieire, Mont Blanc, France) |
title_full_unstemmed |
Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argentieire, Mont Blanc, France) |
title_sort |
microseismic activity within a serac zone in an alpine glacier (glacier d'argentieire, mont blanc, france) |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://insu.hal.science/insu-00343887 https://insu.hal.science/insu-00343887/document https://insu.hal.science/insu-00343887/file/microseismic-activity-within-a-serac-zone-in-an-alpine-glacier-glacier-dargentiere-mont-blanc-france.pdf https://doi.org/10.3189/002214308784409053 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
ISSN: 0022-1430 EISSN: 1727-5652 Journal of Glaciology https://insu.hal.science/insu-00343887 Journal of Glaciology, 2008, 54 (184), pp.157 -168. ⟨10.3189/002214308784409053⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3189/002214308784409053 insu-00343887 https://insu.hal.science/insu-00343887 https://insu.hal.science/insu-00343887/document https://insu.hal.science/insu-00343887/file/microseismic-activity-within-a-serac-zone-in-an-alpine-glacier-glacier-dargentiere-mont-blanc-france.pdf doi:10.3189/002214308784409053 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3189/002214308784409053 |
container_title |
Journal of Glaciology |
container_volume |
54 |
container_issue |
184 |
container_start_page |
157 |
op_container_end_page |
168 |
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