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dc.contributor.author
Lindner, Fabian
dc.contributor.author
Walter, Fabian
dc.contributor.author
Laske, Gabi
dc.contributor.author
Gimbert, Florent
dc.date.accessioned
2020-02-10T08:15:20Z
dc.date.available
2020-02-09T03:30:47Z
dc.date.available
2020-02-10T08:15:20Z
dc.date.issued
2020
dc.identifier.issn
1994-0416
dc.identifier.issn
1994-0424
dc.identifier.other
10.5194/tc-14-287-2020
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/397735
dc.identifier.doi
10.3929/ethz-b-000397735
dc.description.abstract
Hydraulic processes impact viscous and brittle ice deformation. Water-driven fracturing as well as turbulent water flow within and beneath glaciers radiate seismic waves which provide insights into otherwise hard-to-access englacial and subglacial environments. In this study, we analyze glaciohydraulic tremors recorded by four seismic arrays installed in different parts of Glacier de la Plaine Morte, Switzerland. Data were recorded during the 2016 melt season including the sudden subglacial drainage of an ice-marginal lake. Together with our seismic data, discharge, lake level, and ice flow measurements provide constraints on glacier hydraulics. We find that the tremors are generated by subglacial water flow, in moulins, and by icequake bursts. The dominating process can vary on sub-kilometer and sub-daily scales. Consistent with field observations, continuous source tracking via matched-field processing suggests a gradual up-glacier progression of an efficient drainage system as the melt season progresses. The ice-marginal lake likely connects to this drainage system via hydrofracturing, which is indicated by sustained icequake signals emitted from the proximity of the lake basin and starting roughly 24 h prior to the lake drainage. To estimate the hydraulics associated with the drainage, we use tremor–discharge scaling relationships. Our analysis suggests a pressurization of the subglacial environment at the drainage onset, followed by an increase in the hydraulic radii of the conduits and a subsequent decrease in the subglacial water pressure as the capacity of the drainage system increases. The pressurization is in phase with the drop in the lake level, and its retrieved maximum coincides with ice uplift measured via GPS. Our results highlight the use of cryo-seismology for monitoring glacier hydraulics.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus Publications
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Glaciohydraulic seismic tremors on an Alpine glacier
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2020-01-28
ethz.journal.title
The Cryosphere
ethz.journal.volume
14
en_US
ethz.journal.issue
1
en_US
ethz.pages.start
287
en_US
ethz.pages.end
308
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Glacial Hazard Monitoring with Seismology (GlaHMSeis)
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02611 - V. Wasserbau, Hydrologie u. Glaziologie / Lab. Hydraulics,Hydrology,Glaciology::09558 - Walter, Fabian (ehemalig) / Walter, F. ((former))
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02115 - Dep. Bau, Umwelt und Geomatik / Dep. of Civil, Env. and Geomatic Eng.::02611 - V. Wasserbau, Hydrologie u. Glaziologie / Lab. Hydraulics,Hydrology,Glaciology::09558 - Walter, Fabian (ehemalig) / Walter, F. ((former))
ethz.grant.agreementno
157551
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
SNF-Förderungsprofessuren Stufe 2
ethz.relation.isNewVersionOf
10.3929/ethz-b-000368132
ethz.date.deposited
2020-02-09T03:30:58Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2020-02-10T08:15:32Z
ethz.rosetta.lastUpdated
2022-03-29T00:56:26Z
ethz.rosetta.versionExported
true
ethz.COinS
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