Ice mass discharge through the Antarctic subglacial hydrographic network as a trigger for cryoseismicity
We analyse seismic time series collected during experimental campaigns in the area of the David Glacier, 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 i...
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Cambridge University Press
2025-01-01
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| Series: | Journal of Glaciology |
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| Online Access: | https://www.cambridge.org/core/product/identifier/S0022143025100622/type/journal_article |
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| author | Stefania Danesi Simone Salimbeni Alessandra Borghi Stefano Urbini Achille Zirizzotti Massimo Frezzotti |
| author_facet | Stefania Danesi Simone Salimbeni Alessandra Borghi Stefano Urbini Achille Zirizzotti Massimo Frezzotti |
| author_sort | Stefania Danesi |
| collection | DOAJ |
| description | We analyse seismic time series collected during experimental campaigns in the area of the David Glacier, 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 grounding zone, i.e. the region where the ice transitions from grounded ice sheet to freely floating ice shelf. The joint analysis of seismic events and observed local tidal measurements suggests that seismicity is not only triggered by a regular, periodic driver such as the ocean tides but also more likely by transient pulses. We consider potential environmental processes and their impact on the coupling between the glacier flow and the bedrock brittle failure. Among the environmental variables examined, our findings suggest that clustered and repeated seismic events may be related to transient episodes of ice-mass discharge correlated to a change in the subglacial hydrographic system that originates upstream of the glacier, lubricating the interface with the bedrock. This hypothesis is supported by the gravity variation observations provided by the GRACE satellite mission, which observed mass variations during periods characterized by seismic clustering. |
| format | Article |
| id | doaj-art-79d8b502cfc0418abd9c1689e75c79b5 |
| institution | DOAJ |
| issn | 0022-1430 1727-5652 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Cambridge University Press |
| record_format | Article |
| series | Journal of Glaciology |
| spelling | doaj-art-79d8b502cfc0418abd9c1689e75c79b52025-08-20T03:07:24ZengCambridge University PressJournal of Glaciology0022-14301727-56522025-01-017110.1017/jog.2025.10062Ice mass discharge through the Antarctic subglacial hydrographic network as a trigger for cryoseismicityStefania Danesi0https://orcid.org/0000-0002-7884-8242Simone Salimbeni1https://orcid.org/0000-0002-1077-5833Alessandra Borghi2https://orcid.org/0000-0001-6088-0386Stefano Urbini3https://orcid.org/0000-0002-8053-4197Achille Zirizzotti4https://orcid.org/0000-0001-7586-9219Massimo Frezzotti5https://orcid.org/0000-0002-2461-2883Sezione di Bologna, Istituto Nazionale di Geofisica e Vulcanologia, Bologna, ItalySezione di Bologna, Istituto Nazionale di Geofisica e Vulcanologia, Bologna, ItalySezione di Bologna, Istituto Nazionale di Geofisica e Vulcanologia, Bologna, ItalySezione di Roma2, Istituto Nazionale di Geofisica e Vulcanologia, Roma, ItalySezione di Roma2, Istituto Nazionale di Geofisica e Vulcanologia, Roma, ItalyDepartment of Science, Roma Tre University, Rome, ItalyWe analyse seismic time series collected during experimental campaigns in the area of the David Glacier, 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 grounding zone, i.e. the region where the ice transitions from grounded ice sheet to freely floating ice shelf. The joint analysis of seismic events and observed local tidal measurements suggests that seismicity is not only triggered by a regular, periodic driver such as the ocean tides but also more likely by transient pulses. We consider potential environmental processes and their impact on the coupling between the glacier flow and the bedrock brittle failure. Among the environmental variables examined, our findings suggest that clustered and repeated seismic events may be related to transient episodes of ice-mass discharge correlated to a change in the subglacial hydrographic system that originates upstream of the glacier, lubricating the interface with the bedrock. This hypothesis is supported by the gravity variation observations provided by the GRACE satellite mission, which observed mass variations during periods characterized by seismic clustering.https://www.cambridge.org/core/product/identifier/S0022143025100622/type/journal_articleAntarcticaDavid Glacierglacier geophysicsseismicityseismologysubglacial lakessubglacial processes |
| spellingShingle | Stefania Danesi Simone Salimbeni Alessandra Borghi Stefano Urbini Achille Zirizzotti Massimo Frezzotti Ice mass discharge through the Antarctic subglacial hydrographic network as a trigger for cryoseismicity Journal of Glaciology Antarctica David Glacier glacier geophysics seismicity seismology subglacial lakes subglacial processes |
| title | Ice mass discharge through the Antarctic subglacial hydrographic network as a trigger for cryoseismicity |
| title_full | Ice mass discharge through the Antarctic subglacial hydrographic network as a trigger for cryoseismicity |
| title_fullStr | Ice mass discharge through the Antarctic subglacial hydrographic network as a trigger for cryoseismicity |
| title_full_unstemmed | Ice mass discharge through the Antarctic subglacial hydrographic network as a trigger for cryoseismicity |
| title_short | Ice mass discharge through the Antarctic subglacial hydrographic network as a trigger for cryoseismicity |
| title_sort | ice mass discharge through the antarctic subglacial hydrographic network as a trigger for cryoseismicity |
| topic | Antarctica David Glacier glacier geophysics seismicity seismology subglacial lakes subglacial processes |
| url | https://www.cambridge.org/core/product/identifier/S0022143025100622/type/journal_article |
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