Basal icequakes recorded beneath an Alpine glacier (Glacier d 'Argentiere, MontBlanc, France): evidence for stick-slip motion
International audience While basal icequakes associated with glacier motion have been detected under Antarctica for several decades, there remains very little evidence of stick-slip motion for Alpine glaciers. Here we analyzed 2357 basal icequakes that were recorded at Glacier d’Argenti`ere (Mont-Bl...
Published in: | Journal of Geophysical Research: Earth Surface |
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Main Authors: | , , , |
Other Authors: | , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2015
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Online Access: | https://hal.science/hal-01118884 https://hal.science/hal-01118884/document https://hal.science/hal-01118884/file/basal-hal.pdf https://doi.org/10.1002/2014JF003288 |
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openpolar |
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Open Polar |
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Institut national des sciences de l'Univers: HAL-INSU |
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ftinsu |
language |
English |
topic |
[INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Helmstetter, Agnès Nicolas, Barbara Comon, Pierre Gay, Michel Basal icequakes recorded beneath an Alpine glacier (Glacier d 'Argentiere, MontBlanc, France): evidence for stick-slip motion |
topic_facet |
[INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience While basal icequakes associated with glacier motion have been detected under Antarctica for several decades, there remains very little evidence of stick-slip motion for Alpine glaciers. Here we analyzed 2357 basal icequakes that were recorded at Glacier d’Argenti`ere (Mont-Blanc Massif) between February and November of 2012, and that are likely to be associated with basal sliding. These events have been classified into 18 multiplets, based on their waveforms. The strong similarity of the waveforms within each multiplet suggests an isolated repeating source. Despite this similarity, the peak amplitude within each multiplet varies gradually in time, by up to a factor of 18. The distribution of these events in time is relatively complex. For long time scales we observe progressive variations in the amplitudes of events within each multiplet. For intermediate time scales (hours), the events occur regularly in time, with typical return times of several minutes up to several hours. For short time scales (from 0.01 to 100 s), the largest multiplet shows clus- tering in time, with a power-law distribution of the interevent times. The location of these events and their focal mechanisms are not well constrained, because most of these events were detected by a single seismometer. Nevertheless, the locations can be estimated with an accuracy of a few tens of meters using a polarization analysis. The estimated average depth of the basal events is 179 m, which is in good agreement with the estimated glacier thickness. The relative changes in distance between the source and the sensor can be measured accurately by correlating separately the P-wave and S-wave parts of the seismograms of each event with the template waveforms, which are obtained by averaging the signals within each multiplet. We observed small variations in the times between the P-wave and the S-wave of up to 0.6 ms over 50 days. These variations cannot be explained by displacement of the sensor with respect to the glacier, but might be ... |
author2 |
Institut des Sciences de la Terre (ISTerre) Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) GIPSA - Signal Images Physique (GIPSA-SIGMAPHY) Département Images et Signal (GIPSA-DIS) Grenoble Images Parole Signal Automatique (GIPSA-lab) Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Stendhal - Grenoble 3-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Stendhal - Grenoble 3-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Grenoble Images Parole Signal Automatique (GIPSA-lab) Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Stendhal - Grenoble 3-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Stendhal - Grenoble 3-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) Imagerie Ultrasonore Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé (CREATIS) Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon) Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS) GIPSA - Communication Information and Complex Systems (GIPSA-CICS) GIPSA-Services (GIPSA-Services) ANR-11-EQPX-0040,RESIF-CORE,Réseau sismologique et géodésique français : l'équipement fondamental(2011) European Project: 320594,EC:FP7:ERC,ERC-2012-ADG_20120216,DECODA(2013) |
format |
Article in Journal/Newspaper |
author |
Helmstetter, Agnès Nicolas, Barbara Comon, Pierre Gay, Michel |
author_facet |
Helmstetter, Agnès Nicolas, Barbara Comon, Pierre Gay, Michel |
author_sort |
Helmstetter, Agnès |
title |
Basal icequakes recorded beneath an Alpine glacier (Glacier d 'Argentiere, MontBlanc, France): evidence for stick-slip motion |
title_short |
Basal icequakes recorded beneath an Alpine glacier (Glacier d 'Argentiere, MontBlanc, France): evidence for stick-slip motion |
title_full |
Basal icequakes recorded beneath an Alpine glacier (Glacier d 'Argentiere, MontBlanc, France): evidence for stick-slip motion |
title_fullStr |
Basal icequakes recorded beneath an Alpine glacier (Glacier d 'Argentiere, MontBlanc, France): evidence for stick-slip motion |
title_full_unstemmed |
Basal icequakes recorded beneath an Alpine glacier (Glacier d 'Argentiere, MontBlanc, France): evidence for stick-slip motion |
title_sort |
basal icequakes recorded beneath an alpine glacier (glacier d 'argentiere, montblanc, france): evidence for stick-slip motion |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.science/hal-01118884 https://hal.science/hal-01118884/document https://hal.science/hal-01118884/file/basal-hal.pdf https://doi.org/10.1002/2014JF003288 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ISSN: 2169-9003 EISSN: 2169-9011 Journal of Geophysical Research: Earth Surface https://hal.science/hal-01118884 Journal of Geophysical Research: Earth Surface, 2015, 120 (3), pp.379-401. ⟨10.1002/2014JF003288⟩ http://onlinelibrary.wiley.com/doi/10.1002/jgrf.v120.3/issuetoc |
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op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2014JF00328810.1002/jgrf.v120.3/issuetoc |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
120 |
container_issue |
3 |
container_start_page |
379 |
op_container_end_page |
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ftinsu:oai:HAL:hal-01118884v1 2024-04-28T07:57:46+00:00 Basal icequakes recorded beneath an Alpine glacier (Glacier d 'Argentiere, MontBlanc, France): evidence for stick-slip motion Helmstetter, Agnès Nicolas, Barbara Comon, Pierre Gay, Michel Institut des Sciences de la Terre (ISTerre) Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) GIPSA - Signal Images Physique (GIPSA-SIGMAPHY) Département Images et Signal (GIPSA-DIS) Grenoble Images Parole Signal Automatique (GIPSA-lab) Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Stendhal - Grenoble 3-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Stendhal - Grenoble 3-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Grenoble Images Parole Signal Automatique (GIPSA-lab) Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Stendhal - Grenoble 3-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Stendhal - Grenoble 3-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) Imagerie Ultrasonore Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé (CREATIS) Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon) Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS) GIPSA - Communication Information and Complex Systems (GIPSA-CICS) GIPSA-Services (GIPSA-Services) ANR-11-EQPX-0040,RESIF-CORE,Réseau sismologique et géodésique français : l'équipement fondamental(2011) European Project: 320594,EC:FP7:ERC,ERC-2012-ADG_20120216,DECODA(2013) 2015-03-16 https://hal.science/hal-01118884 https://hal.science/hal-01118884/document https://hal.science/hal-01118884/file/basal-hal.pdf https://doi.org/10.1002/2014JF003288 en eng HAL CCSD American Geophysical Union/Wiley info:eu-repo/semantics/altIdentifier/doi/10.1002/2014JF003288 info:eu-repo/grantAgreement/EC/FP7/320594/EU/Tensor Decomposition for Data Analysis with Applications to Health and Environment/DECODA hal-01118884 https://hal.science/hal-01118884 https://hal.science/hal-01118884/document https://hal.science/hal-01118884/file/basal-hal.pdf doi:10.1002/2014JF003288 info:eu-repo/semantics/OpenAccess ISSN: 2169-9003 EISSN: 2169-9011 Journal of Geophysical Research: Earth Surface https://hal.science/hal-01118884 Journal of Geophysical Research: Earth Surface, 2015, 120 (3), pp.379-401. ⟨10.1002/2014JF003288⟩ http://onlinelibrary.wiley.com/doi/10.1002/jgrf.v120.3/issuetoc [INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2015 ftinsu https://doi.org/10.1002/2014JF00328810.1002/jgrf.v120.3/issuetoc 2024-04-05T00:50:19Z International audience While basal icequakes associated with glacier motion have been detected under Antarctica for several decades, there remains very little evidence of stick-slip motion for Alpine glaciers. Here we analyzed 2357 basal icequakes that were recorded at Glacier d’Argenti`ere (Mont-Blanc Massif) between February and November of 2012, and that are likely to be associated with basal sliding. These events have been classified into 18 multiplets, based on their waveforms. The strong similarity of the waveforms within each multiplet suggests an isolated repeating source. Despite this similarity, the peak amplitude within each multiplet varies gradually in time, by up to a factor of 18. The distribution of these events in time is relatively complex. For long time scales we observe progressive variations in the amplitudes of events within each multiplet. For intermediate time scales (hours), the events occur regularly in time, with typical return times of several minutes up to several hours. For short time scales (from 0.01 to 100 s), the largest multiplet shows clus- tering in time, with a power-law distribution of the interevent times. The location of these events and their focal mechanisms are not well constrained, because most of these events were detected by a single seismometer. Nevertheless, the locations can be estimated with an accuracy of a few tens of meters using a polarization analysis. The estimated average depth of the basal events is 179 m, which is in good agreement with the estimated glacier thickness. The relative changes in distance between the source and the sensor can be measured accurately by correlating separately the P-wave and S-wave parts of the seismograms of each event with the template waveforms, which are obtained by averaging the signals within each multiplet. We observed small variations in the times between the P-wave and the S-wave of up to 0.6 ms over 50 days. These variations cannot be explained by displacement of the sensor with respect to the glacier, but might be ... Article in Journal/Newspaper Antarc* Antarctica Institut national des sciences de l'Univers: HAL-INSU Journal of Geophysical Research: Earth Surface 120 3 379 401 |