Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argenti'ere, Mont Blanc, France)
International audience A passive seismic study was carried out underneath Glacier d'Argenti'ere, 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...
Main Authors: | , , , , |
---|---|
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2008
|
Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/halsde-00799455 |
id |
ftunigrenoble:oai:HAL:halsde-00799455v1 |
---|---|
record_format |
openpolar |
spelling |
ftunigrenoble:oai:HAL:halsde-00799455v1 2023-05-15T16:57:10+02:00 Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argenti'ere, Mont Blanc, France) Roux, Pierre-François Marsan, Davd Métaxian, Jean-Philippe O'Brien, Gareth 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)-Centre National de la Recherche Scientifique (CNRS) Seismology and Computational Rock Physics Laboratory University College Dublin Dublin (UCD) Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ) 2008 https://hal.archives-ouvertes.fr/halsde-00799455 en eng HAL CCSD International Glaciological Society halsde-00799455 https://hal.archives-ouvertes.fr/halsde-00799455 ISSN: 0022-1430 Journal of Glaciology https://hal.archives-ouvertes.fr/halsde-00799455 Journal of Glaciology, International Glaciological Society, 2008, 54 (184), pp. 157-167 [SDE.ES]Environmental Sciences/Environmental and Society info:eu-repo/semantics/article Journal articles 2008 ftunigrenoble 2021-09-14T22:43:59Z International audience A passive seismic study was carried out underneath Glacier d'Argenti'ere, 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 rangeML = −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 Mont Blanc ENVELOPE(69.468,69.468,-49.461,-49.461) |
institution |
Open Polar |
collection |
Université Grenoble Alpes: HAL |
op_collection_id |
ftunigrenoble |
language |
English |
topic |
[SDE.ES]Environmental Sciences/Environmental and Society |
spellingShingle |
[SDE.ES]Environmental Sciences/Environmental and Society Roux, Pierre-François Marsan, Davd Métaxian, Jean-Philippe O'Brien, Gareth Moreau, Luc Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argenti'ere, Mont Blanc, France) |
topic_facet |
[SDE.ES]Environmental Sciences/Environmental and Society |
description |
International audience A passive seismic study was carried out underneath Glacier d'Argenti'ere, 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 rangeML = −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)-Centre National de la Recherche Scientifique (CNRS) Seismology and Computational Rock Physics Laboratory University College Dublin Dublin (UCD) Environnements, Dynamiques et Territoires de la Montagne (EDYTEM) Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ) |
format |
Article in Journal/Newspaper |
author |
Roux, Pierre-François Marsan, Davd Métaxian, Jean-Philippe O'Brien, Gareth Moreau, Luc |
author_facet |
Roux, Pierre-François Marsan, Davd Métaxian, Jean-Philippe O'Brien, Gareth Moreau, Luc |
author_sort |
Roux, Pierre-François |
title |
Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argenti'ere, Mont Blanc, France) |
title_short |
Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argenti'ere, Mont Blanc, France) |
title_full |
Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argenti'ere, Mont Blanc, France) |
title_fullStr |
Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argenti'ere, Mont Blanc, France) |
title_full_unstemmed |
Microseismic activity within a serac zone in an alpine glacier (Glacier d'Argenti'ere, Mont Blanc, France) |
title_sort |
microseismic activity within a serac zone in an alpine glacier (glacier d'argenti'ere, mont blanc, france) |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.archives-ouvertes.fr/halsde-00799455 |
long_lat |
ENVELOPE(69.468,69.468,-49.461,-49.461) |
geographic |
Mont Blanc |
geographic_facet |
Mont Blanc |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
ISSN: 0022-1430 Journal of Glaciology https://hal.archives-ouvertes.fr/halsde-00799455 Journal of Glaciology, International Glaciological Society, 2008, 54 (184), pp. 157-167 |
op_relation |
halsde-00799455 https://hal.archives-ouvertes.fr/halsde-00799455 |
_version_ |
1766048442419773440 |