Cryo-seismicity triggered by ice mass discharge through the Antarctic subglacial hydrographic network
We analyze seismic time series collected during experimental campaigns in the area of the David Glacier, South Victoria Land, Antarctica, between 2003 and 2016. We observe hundreds of repeating seismic events, characterized by highly correlated waveforms (cross-correlation > 0.95), which mainly o...
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ftcopernicus:oai:publications.copernicus.org:egusphere101857 2023-05-15T14:02:18+02:00 Cryo-seismicity triggered by ice mass discharge through the Antarctic subglacial hydrographic network Danesi, Stefania Salimbeni, Simone Borghi, Alessandra Urbini, Stefano Frezzotti, Massimo 2022-04-13 application/pdf https://doi.org/10.5194/egusphere-2022-29 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-29/ eng eng doi:10.5194/egusphere-2022-29 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-29/ eISSN: Text 2022 ftcopernicus https://doi.org/10.5194/egusphere-2022-29 2022-04-18T16:21:49Z We analyze seismic time series collected during experimental campaigns in the area of the David Glacier, South Victoria Land, Antarctica, between 2003 and 2016. We observe hundreds of repeating seismic events, characterized by highly correlated waveforms (cross-correlation > 0.95), which mainly occur in the floating area between the grounding and the floating line of the ice stream. The joint analysis of seismic occurrences and observed local tide measurements seem to show that seismicity is not triggered by a seasonal, regular, periodic forcing such as the ocean tide, but more likely by transient irregular impulses. We consider possible environmental processes and their impact on the coupling between the glacier flow and the bedrock brittle failure. Our results suggest that clustered and repeated seismic events may be correlated with transient episodes of mass ice discharge (observed by satellite GRACE and GRACE-FO experiments) through the subglacial hydrographic system that originates upstream of the glacier and extends to the grounding zone, lubricating the interface with the bedrock. Text Antarc* Antarctic Antarctica David Glacier Victoria Land Copernicus Publications: E-Journals Antarctic David Glacier ENVELOPE(160.000,160.000,-75.333,-75.333) The Antarctic Victoria Land |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
We analyze seismic time series collected during experimental campaigns in the area of the David Glacier, South Victoria Land, Antarctica, between 2003 and 2016. We observe hundreds of repeating seismic events, characterized by highly correlated waveforms (cross-correlation > 0.95), which mainly occur in the floating area between the grounding and the floating line of the ice stream. The joint analysis of seismic occurrences and observed local tide measurements seem to show that seismicity is not triggered by a seasonal, regular, periodic forcing such as the ocean tide, but more likely by transient irregular impulses. We consider possible environmental processes and their impact on the coupling between the glacier flow and the bedrock brittle failure. Our results suggest that clustered and repeated seismic events may be correlated with transient episodes of mass ice discharge (observed by satellite GRACE and GRACE-FO experiments) through the subglacial hydrographic system that originates upstream of the glacier and extends to the grounding zone, lubricating the interface with the bedrock. |
format |
Text |
author |
Danesi, Stefania Salimbeni, Simone Borghi, Alessandra Urbini, Stefano Frezzotti, Massimo |
spellingShingle |
Danesi, Stefania Salimbeni, Simone Borghi, Alessandra Urbini, Stefano Frezzotti, Massimo Cryo-seismicity triggered by ice mass discharge through the Antarctic subglacial hydrographic network |
author_facet |
Danesi, Stefania Salimbeni, Simone Borghi, Alessandra Urbini, Stefano Frezzotti, Massimo |
author_sort |
Danesi, Stefania |
title |
Cryo-seismicity triggered by ice mass discharge through the Antarctic subglacial hydrographic network |
title_short |
Cryo-seismicity triggered by ice mass discharge through the Antarctic subglacial hydrographic network |
title_full |
Cryo-seismicity triggered by ice mass discharge through the Antarctic subglacial hydrographic network |
title_fullStr |
Cryo-seismicity triggered by ice mass discharge through the Antarctic subglacial hydrographic network |
title_full_unstemmed |
Cryo-seismicity triggered by ice mass discharge through the Antarctic subglacial hydrographic network |
title_sort |
cryo-seismicity triggered by ice mass discharge through the antarctic subglacial hydrographic network |
publishDate |
2022 |
url |
https://doi.org/10.5194/egusphere-2022-29 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-29/ |
long_lat |
ENVELOPE(160.000,160.000,-75.333,-75.333) |
geographic |
Antarctic David Glacier The Antarctic Victoria Land |
geographic_facet |
Antarctic David Glacier The Antarctic Victoria Land |
genre |
Antarc* Antarctic Antarctica David Glacier Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica David Glacier Victoria Land |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2022-29 https://egusphere.copernicus.org/preprints/2022/egusphere-2022-29/ |
op_doi |
https://doi.org/10.5194/egusphere-2022-29 |
_version_ |
1766272495666593792 |