Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event
International audience Understanding the dynamic response of glaciers to climate change is vital for assessing water resources and hazards, and subglacial hydrology is a key player in glacier systems. Traditional observations of subglacial hydrology are spatially and temporally limited, but recent s...
Published in: | Journal of Geophysical Research: Earth Surface |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://insu.hal.science/insu-03706385 https://insu.hal.science/insu-03706385/document https://insu.hal.science/insu-03706385/file/JGR%20Earth%20Surface%20-%202022%20-%20Labedz%20-%20Seismic%20Mapping%20of%20Subglacial%20Hydrology%20Reveals%20Previously%20Undetected%20Pressurization.pdf https://doi.org/10.1029/2021JF006406 |
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ftinsu:oai:HAL:insu-03706385v1 2024-04-28T08:19:43+00:00 Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event Labedz, Celeste R. Bartholomaus, Timothy C. Amundson, Jason M. Gimbert, Florent Karplus, Marianne S. Tsai, Victor C. Veitch, Stephen A. Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) 2022 https://insu.hal.science/insu-03706385 https://insu.hal.science/insu-03706385/document https://insu.hal.science/insu-03706385/file/JGR%20Earth%20Surface%20-%202022%20-%20Labedz%20-%20Seismic%20Mapping%20of%20Subglacial%20Hydrology%20Reveals%20Previously%20Undetected%20Pressurization.pdf https://doi.org/10.1029/2021JF006406 en eng HAL CCSD American Geophysical Union/Wiley info:eu-repo/semantics/altIdentifier/doi/10.1029/2021JF006406 insu-03706385 https://insu.hal.science/insu-03706385 https://insu.hal.science/insu-03706385/document https://insu.hal.science/insu-03706385/file/JGR%20Earth%20Surface%20-%202022%20-%20Labedz%20-%20Seismic%20Mapping%20of%20Subglacial%20Hydrology%20Reveals%20Previously%20Undetected%20Pressurization.pdf BIBCODE: 2022JGRF.12706406L doi:10.1029/2021JF006406 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 2169-9003 EISSN: 2169-9011 Journal of Geophysical Research: Earth Surface https://insu.hal.science/insu-03706385 Journal of Geophysical Research: Earth Surface, 2022, 127, ⟨10.1029/2021JF006406⟩ cryoseismology environmental seismology glacier hydrology seismology glaciology [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2022 ftinsu https://doi.org/10.1029/2021JF006406 2024-04-05T00:29:47Z International audience Understanding the dynamic response of glaciers to climate change is vital for assessing water resources and hazards, and subglacial hydrology is a key player in glacier systems. Traditional observations of subglacial hydrology are spatially and temporally limited, but recent seismic deployments on and around glaciers show the potential for comprehensive observation of glacial hydrologic systems. We present results from a high-density seismic deployment spanning the surface of Lemon Creek Glacier, Alaska. Our study coincided with a marginal lake drainage event, which served as a natural experiment for seismic detection of changes in subglacial hydrology. We observed glaciohydraulic tremor across the surface of the glacier that was generated by the subglacial hydrologic system. During the lake drainage, the relative changes in seismic tremor power and water flux are consistent with pressurization of the subglacial system of only the upper part of the glacier. This event was not accompanied by a significant increase in glacier velocity; either some threshold necessary for rapid basal motion was not attained, or, plausibly, the geometry of Lemon Creek Glacier inhibited speedup. This pressurization event would have likely gone undetected without seismic observations, demonstrating the power of cryoseismology in testing assumptions about and mapping the spatial extent of subglacial pressurization. Article in Journal/Newspaper glacier glaciers Alaska Institut national des sciences de l'Univers: HAL-INSU Journal of Geophysical Research: Earth Surface 127 3 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
cryoseismology environmental seismology glacier hydrology seismology glaciology [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
cryoseismology environmental seismology glacier hydrology seismology glaciology [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Labedz, Celeste R. Bartholomaus, Timothy C. Amundson, Jason M. Gimbert, Florent Karplus, Marianne S. Tsai, Victor C. Veitch, Stephen A. Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event |
topic_facet |
cryoseismology environmental seismology glacier hydrology seismology glaciology [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Understanding the dynamic response of glaciers to climate change is vital for assessing water resources and hazards, and subglacial hydrology is a key player in glacier systems. Traditional observations of subglacial hydrology are spatially and temporally limited, but recent seismic deployments on and around glaciers show the potential for comprehensive observation of glacial hydrologic systems. We present results from a high-density seismic deployment spanning the surface of Lemon Creek Glacier, Alaska. Our study coincided with a marginal lake drainage event, which served as a natural experiment for seismic detection of changes in subglacial hydrology. We observed glaciohydraulic tremor across the surface of the glacier that was generated by the subglacial hydrologic system. During the lake drainage, the relative changes in seismic tremor power and water flux are consistent with pressurization of the subglacial system of only the upper part of the glacier. This event was not accompanied by a significant increase in glacier velocity; either some threshold necessary for rapid basal motion was not attained, or, plausibly, the geometry of Lemon Creek Glacier inhibited speedup. This pressurization event would have likely gone undetected without seismic observations, demonstrating the power of cryoseismology in testing assumptions about and mapping the spatial extent of subglacial pressurization. |
author2 |
Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) |
format |
Article in Journal/Newspaper |
author |
Labedz, Celeste R. Bartholomaus, Timothy C. Amundson, Jason M. Gimbert, Florent Karplus, Marianne S. Tsai, Victor C. Veitch, Stephen A. |
author_facet |
Labedz, Celeste R. Bartholomaus, Timothy C. Amundson, Jason M. Gimbert, Florent Karplus, Marianne S. Tsai, Victor C. Veitch, Stephen A. |
author_sort |
Labedz, Celeste R. |
title |
Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event |
title_short |
Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event |
title_full |
Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event |
title_fullStr |
Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event |
title_full_unstemmed |
Seismic Mapping of Subglacial Hydrology Reveals Previously Undetected Pressurization Event |
title_sort |
seismic mapping of subglacial hydrology reveals previously undetected pressurization event |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://insu.hal.science/insu-03706385 https://insu.hal.science/insu-03706385/document https://insu.hal.science/insu-03706385/file/JGR%20Earth%20Surface%20-%202022%20-%20Labedz%20-%20Seismic%20Mapping%20of%20Subglacial%20Hydrology%20Reveals%20Previously%20Undetected%20Pressurization.pdf https://doi.org/10.1029/2021JF006406 |
genre |
glacier glaciers Alaska |
genre_facet |
glacier glaciers Alaska |
op_source |
ISSN: 2169-9003 EISSN: 2169-9011 Journal of Geophysical Research: Earth Surface https://insu.hal.science/insu-03706385 Journal of Geophysical Research: Earth Surface, 2022, 127, ⟨10.1029/2021JF006406⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2021JF006406 insu-03706385 https://insu.hal.science/insu-03706385 https://insu.hal.science/insu-03706385/document https://insu.hal.science/insu-03706385/file/JGR%20Earth%20Surface%20-%202022%20-%20Labedz%20-%20Seismic%20Mapping%20of%20Subglacial%20Hydrology%20Reveals%20Previously%20Undetected%20Pressurization.pdf BIBCODE: 2022JGRF.12706406L doi:10.1029/2021JF006406 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2021JF006406 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
127 |
container_issue |
3 |
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1797583067355807744 |