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dc.contributor.author
Lindner, Fabian
dc.contributor.author
Laske, Gabi
dc.contributor.author
Walter, Fabian
dc.contributor.author
Doran, Adrian
dc.date.accessioned
2019-08-15T12:39:34Z
dc.date.available
2018-12-04T10:02:31Z
dc.date.available
2018-12-04T16:05:34Z
dc.date.available
2019-05-10T15:31:24Z
dc.date.available
2019-08-15T12:39:34Z
dc.date.issued
2019-09
dc.identifier.issn
0260-3055
dc.identifier.issn
1727-5644
dc.identifier.other
10.1017/aog.2018.25
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/308492
dc.identifier.doi
10.3929/ethz-b-000308492
dc.description.abstract
Crevasses and englacial fracture networks route meltwater from a glacier's surface to the subglacial drainage system and thus influence glacial hydraulics. However, rapid fracture growth may also lead to sudden and potentially hazardous structural failure of unstable glaciers and ice dams, rifting of ice shelves, or iceberg calving. Here, we use passive seismic recordings to investigate the englacial fracture network on Glacier de la Plaine Morte, Switzerland. Glacier dynamics and the drainage of an ice-marginal lake give rise to numerous icequakes, the majority of which generate dispersed, high-frequency Rayleigh waves. A wide distribution of events allows us to study azimuthal anisotropy between 10 and 30 Hz in order to extract englacial seismic velocities in regions of preferentially oriented crevasses. Beamforming applied to a 100-m-aperture array reveals azimuthal anisotropy of Rayleigh-wave phase velocities reaching a strength of 8% at high frequencies. In addition, we find that the fast direction of wave propagation coincides with the observed surface strike of the narrow crevasses. Forward modeling and inversion of dispersion curves suggest that the azimuthal anisotropy is induced by a 40-m-thick crevassed layer at the surface of the glacier with 8% anisotropy in shear-wave velocity.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
International Glaciological Society
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
anisotropic ice
en_US
dc.subject
crevasses
en_US
dc.subject
ice thickness measurements
en_US
dc.subject
seismology
en_US
dc.title
Crevasse-induced Rayleigh-wave azimuthal anisotropy on Glacier de la Plaine Morte, Switzerland
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2018-11-23
ethz.journal.title
Annals of Glaciology
ethz.journal.volume
60
en_US
ethz.journal.issue
79
en_US
ethz.journal.abbreviated
Ann Glaciol
ethz.pages.start
96
en_US
ethz.pages.end
111
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
Cambridge
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))
en_US
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))
en_US
ethz.grant.agreementno
157551
ethz.grant.agreementno
157551
ethz.grant.fundername
SNF
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
SNF-Förderungsprofessuren Stufe 2
ethz.grant.program
SNF-Förderungsprofessuren Stufe 2
ethz.date.deposited
2018-12-04T10:02:37Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2019-08-15T12:39:50Z
ethz.rosetta.lastUpdated
2022-03-28T23:29:46Z
ethz.rosetta.versionExported
true
ethz.COinS
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