Joint geodetic and seismic analysis of surface crevassing near a seasonal glacier-dammed lake at Gornergletscher, Switzerland
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...
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Cambridge University Press
2019
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ftdoajarticles:oai:doaj.org/article:313be00fc00f41f1abcba4dfc84e97c8 2023-05-15T13:29:31+02:00 Joint geodetic and seismic analysis of surface crevassing near a seasonal glacier-dammed lake at Gornergletscher, Switzerland Louis Garcia Karen Luttrell Debi Kilb Fabian Walter 2019-09-01T00:00:00Z https://doi.org/10.1017/aog.2018.32 https://doaj.org/article/313be00fc00f41f1abcba4dfc84e97c8 EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0260305518000320/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2018.32 0260-3055 1727-5644 https://doaj.org/article/313be00fc00f41f1abcba4dfc84e97c8 Annals of Glaciology, Vol 60, Pp 1-13 (2019) crevasses glacier flow glacier geophysics glaciological instruments and methods seismology Meteorology. Climatology QC851-999 article 2019 ftdoajarticles https://doi.org/10.1017/aog.2018.32 2023-03-12T01:31:55Z 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. Article in Journal/Newspaper Annals of Glaciology Directory of Open Access Journals: DOAJ Articles Dammed Lake ENVELOPE(-68.258,-68.258,68.496,68.496) Annals of Glaciology 60 79 1 13 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
crevasses glacier flow glacier geophysics glaciological instruments and methods seismology Meteorology. Climatology QC851-999 |
spellingShingle |
crevasses glacier flow glacier geophysics glaciological instruments and methods seismology Meteorology. Climatology QC851-999 Louis Garcia Karen Luttrell Debi Kilb Fabian Walter Joint geodetic and seismic analysis of surface crevassing near a seasonal glacier-dammed lake at Gornergletscher, Switzerland |
topic_facet |
crevasses glacier flow glacier geophysics glaciological instruments and methods seismology Meteorology. Climatology QC851-999 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Louis Garcia Karen Luttrell Debi Kilb Fabian Walter |
author_facet |
Louis Garcia Karen Luttrell Debi Kilb Fabian Walter |
author_sort |
Louis Garcia |
title |
Joint geodetic and seismic analysis of surface crevassing near a seasonal glacier-dammed lake at Gornergletscher, Switzerland |
title_short |
Joint geodetic and seismic analysis of surface crevassing near a seasonal glacier-dammed lake at Gornergletscher, Switzerland |
title_full |
Joint geodetic and seismic analysis of surface crevassing near a seasonal glacier-dammed lake at Gornergletscher, Switzerland |
title_fullStr |
Joint geodetic and seismic analysis of surface crevassing near a seasonal glacier-dammed lake at Gornergletscher, Switzerland |
title_full_unstemmed |
Joint geodetic and seismic analysis of surface crevassing near a seasonal glacier-dammed lake at Gornergletscher, Switzerland |
title_sort |
joint geodetic and seismic analysis of surface crevassing near a seasonal glacier-dammed lake at gornergletscher, switzerland |
publisher |
Cambridge University Press |
publishDate |
2019 |
url |
https://doi.org/10.1017/aog.2018.32 https://doaj.org/article/313be00fc00f41f1abcba4dfc84e97c8 |
long_lat |
ENVELOPE(-68.258,-68.258,68.496,68.496) |
geographic |
Dammed Lake |
geographic_facet |
Dammed Lake |
genre |
Annals of Glaciology |
genre_facet |
Annals of Glaciology |
op_source |
Annals of Glaciology, Vol 60, Pp 1-13 (2019) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0260305518000320/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2018.32 0260-3055 1727-5644 https://doaj.org/article/313be00fc00f41f1abcba4dfc84e97c8 |
op_doi |
https://doi.org/10.1017/aog.2018.32 |
container_title |
Annals of Glaciology |
container_volume |
60 |
container_issue |
79 |
container_start_page |
1 |
op_container_end_page |
13 |
_version_ |
1766001045159280640 |