Bimodal pattern of seismicity detected at the ocean margin of an Antarctic ice shelf
International audience In Antarctica, locally grounded ice, such as ice rises bordering floating ice shelves, plays a major role in the ice mass balance as it stabilizes the ice sheet flow from the hinterland. When in direct contact with the ocean, the ice rise buttressing effect may be altered in r...
Published in: | Geophysical Journal International |
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ftinsu:oai:HAL:insu-03581312v1 2023-06-18T03:38:03+02:00 Bimodal pattern of seismicity detected at the ocean margin of an Antarctic ice shelf Lombardi, Denis Benoit, Lionel Camelbeeck, Thierry Martin, Olivier Meynard, Christophe Thom, Christian Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Université Paris Cité (UPCité) 2016 https://hal-insu.archives-ouvertes.fr/insu-03581312 https://hal-insu.archives-ouvertes.fr/insu-03581312/document https://hal-insu.archives-ouvertes.fr/insu-03581312/file/ggw214.pdf https://doi.org/10.1093/gji/ggw214 en eng HAL CCSD Oxford University Press (OUP) info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggw214 insu-03581312 https://hal-insu.archives-ouvertes.fr/insu-03581312 https://hal-insu.archives-ouvertes.fr/insu-03581312/document https://hal-insu.archives-ouvertes.fr/insu-03581312/file/ggw214.pdf BIBCODE: 2016GeoJI.206.1375L doi:10.1093/gji/ggw214 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal-insu.archives-ouvertes.fr/insu-03581312 Geophysical Journal International, 2016, 206, pp.1375-1381. ⟨10.1093/gji/ggw214⟩ Seismic cycle Transient deformation Tides and planetary waves Glaciology Fracture and flow Antarctica [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2016 ftinsu https://doi.org/10.1093/gji/ggw214 2023-06-05T20:52:07Z International audience In Antarctica, locally grounded ice, such as ice rises bordering floating ice shelves, plays a major role in the ice mass balance as it stabilizes the ice sheet flow from the hinterland. When in direct contact with the ocean, the ice rise buttressing effect may be altered in response of changing ocean forcing. To investigate this vulnerable zone, four sites near the boundary of an ice shelf with an ice rise promontory in Dronning Maud Land, East-Antarctica were monitored for a month in early 2014 with new instruments that include both seismic and GPS sensors. Our study indicated that this transition zone experiences periodic seismic activity resulting from surface crevassing during oceanic tide-induced flexure of the ice shelf. The most significant finding is the observation of apparent fortnightly tide-modulated low-frequency, long-duration seismic events at the seaward front of the ice rise promontory. A basal origin of these events is postulated with the ocean water surge at each new spring tide triggering basal crevassing or basal slip on a local bedrock asperity. Detection and monitoring of such seismicity may help identifying ice rise zones vulnerable to intensified ocean forcing. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet Ice Shelf Ice Shelves Institut national des sciences de l'Univers: HAL-INSU Antarctic Dronning Maud Land East Antarctica Geophysical Journal International 206 2 1375 1381 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Seismic cycle Transient deformation Tides and planetary waves Glaciology Fracture and flow Antarctica [SDU]Sciences of the Universe [physics] |
spellingShingle |
Seismic cycle Transient deformation Tides and planetary waves Glaciology Fracture and flow Antarctica [SDU]Sciences of the Universe [physics] Lombardi, Denis Benoit, Lionel Camelbeeck, Thierry Martin, Olivier Meynard, Christophe Thom, Christian Bimodal pattern of seismicity detected at the ocean margin of an Antarctic ice shelf |
topic_facet |
Seismic cycle Transient deformation Tides and planetary waves Glaciology Fracture and flow Antarctica [SDU]Sciences of the Universe [physics] |
description |
International audience In Antarctica, locally grounded ice, such as ice rises bordering floating ice shelves, plays a major role in the ice mass balance as it stabilizes the ice sheet flow from the hinterland. When in direct contact with the ocean, the ice rise buttressing effect may be altered in response of changing ocean forcing. To investigate this vulnerable zone, four sites near the boundary of an ice shelf with an ice rise promontory in Dronning Maud Land, East-Antarctica were monitored for a month in early 2014 with new instruments that include both seismic and GPS sensors. Our study indicated that this transition zone experiences periodic seismic activity resulting from surface crevassing during oceanic tide-induced flexure of the ice shelf. The most significant finding is the observation of apparent fortnightly tide-modulated low-frequency, long-duration seismic events at the seaward front of the ice rise promontory. A basal origin of these events is postulated with the ocean water surge at each new spring tide triggering basal crevassing or basal slip on a local bedrock asperity. Detection and monitoring of such seismicity may help identifying ice rise zones vulnerable to intensified ocean forcing. |
author2 |
Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Université Paris Cité (UPCité) |
format |
Article in Journal/Newspaper |
author |
Lombardi, Denis Benoit, Lionel Camelbeeck, Thierry Martin, Olivier Meynard, Christophe Thom, Christian |
author_facet |
Lombardi, Denis Benoit, Lionel Camelbeeck, Thierry Martin, Olivier Meynard, Christophe Thom, Christian |
author_sort |
Lombardi, Denis |
title |
Bimodal pattern of seismicity detected at the ocean margin of an Antarctic ice shelf |
title_short |
Bimodal pattern of seismicity detected at the ocean margin of an Antarctic ice shelf |
title_full |
Bimodal pattern of seismicity detected at the ocean margin of an Antarctic ice shelf |
title_fullStr |
Bimodal pattern of seismicity detected at the ocean margin of an Antarctic ice shelf |
title_full_unstemmed |
Bimodal pattern of seismicity detected at the ocean margin of an Antarctic ice shelf |
title_sort |
bimodal pattern of seismicity detected at the ocean margin of an antarctic ice shelf |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal-insu.archives-ouvertes.fr/insu-03581312 https://hal-insu.archives-ouvertes.fr/insu-03581312/document https://hal-insu.archives-ouvertes.fr/insu-03581312/file/ggw214.pdf https://doi.org/10.1093/gji/ggw214 |
geographic |
Antarctic Dronning Maud Land East Antarctica |
geographic_facet |
Antarctic Dronning Maud Land East Antarctica |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet Ice Shelf Ice Shelves |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet Ice Shelf Ice Shelves |
op_source |
ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://hal-insu.archives-ouvertes.fr/insu-03581312 Geophysical Journal International, 2016, 206, pp.1375-1381. ⟨10.1093/gji/ggw214⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggw214 insu-03581312 https://hal-insu.archives-ouvertes.fr/insu-03581312 https://hal-insu.archives-ouvertes.fr/insu-03581312/document https://hal-insu.archives-ouvertes.fr/insu-03581312/file/ggw214.pdf BIBCODE: 2016GeoJI.206.1375L doi:10.1093/gji/ggw214 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1093/gji/ggw214 |
container_title |
Geophysical Journal International |
container_volume |
206 |
container_issue |
2 |
container_start_page |
1375 |
op_container_end_page |
1381 |
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1769010867566804992 |