Joint geodetic and seismic analysis of surface crevassing near a seasonal glacier-dammed lake at Gornergletscher, Switzerland
dc.contributor.author
Garcia, Louis
dc.contributor.author
Luttrell, Karen
dc.contributor.author
Kilb, Debi
dc.contributor.author
Walter, Fabian
dc.date.accessioned
2019-08-19T08:01:31Z
dc.date.available
2019-08-17T20:46:13Z
dc.date.available
2019-08-19T08:01:31Z
dc.date.issued
2019-09
dc.identifier.issn
0260-3055
dc.identifier.issn
1727-5644
dc.identifier.other
10.1017/aog.2018.32
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/359150
dc.identifier.doi
10.3929/ethz-b-000359150
dc.description.abstract
Seasonal lake Gornersee forms at the confluence of Gornergletscher and Grenzgletscher, Switzerland, and experiences outburst floods annually in midsummer. To study the interplay between lake drainage, glacier movement and crevasse activity, high-frequency seismometers and GPS receivers were deployed in networks near Gornersee during the summer ablation seasons of 2004, 2006 and 2007. We use a Rayleigh wave coherence method to locate 3289, 7939 and 4087 icequakes, respectively, primarily along well-defined surface crevasses. We calculate two-dimensional strains from triads of GPS stations and find mean differential strain rates of ~300 × 10−6 d−1 with diurnal variations up to 800 × 10−6 d−1. Crevasse icequake activity and glacial velocity are highest during early season, then decrease as meltwater channels erode and subglacial water pressure decreases. Glacial response to Gornersee drainage varied year-to-year, with icequake activity promoted at some crevasses and inhibited at others, suggesting syn-drainage icequakes may be indicative of local drainage patterns and small-scale features of the stress field. Diurnal pulses in icequake activity exhibit peak activity at different times of day in different locations, coincident with a southeast-to-northwest trending concentrated shear zone near the Gornergletscher–Grenzgletscher confluence, likely due to differences in the timing of peak strain rate in these regions.
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
crevasses
en_US
dc.subject
glacier flow
en_US
dc.subject
glacier geophysics
en_US
dc.subject
glaciological instruments and methods
en_US
dc.subject
seismology
en_US
dc.title
Joint geodetic and seismic analysis of surface crevassing near a seasonal glacier-dammed lake at Gornergletscher, Switzerland
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2019-01-09
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
1
en_US
ethz.pages.end
13
en_US
ethz.version.deposit
publishedVersion
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))
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.date.deposited
2019-08-17T20:46:20Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2019-08-19T08:01:41Z
ethz.rosetta.lastUpdated
2022-03-28T23:30:23Z
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true
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