Effects of geometry on the seismic wavefield of Alpine glaciers
Passive seismology allows measurement of the structure of glaciers and ice sheets. However, most techniques used so far in this context are based on horizontally homogeneous media where parameters vary only with depth (1-D approximations), which are appropriate only for a subset of glaciers. Here, w...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/312814 2023-05-15T13:29:27+02:00 Effects of geometry on the seismic wavefield of Alpine glaciers Preiswerk, Lukas Michel, Clotaire Walter, Fabian Fäh, Donat 2019-09 application/application/pdf https://hdl.handle.net/20.500.11850/312814 https://doi.org/10.3929/ethz-b-000312814 en eng International Glaciological Society info:eu-repo/semantics/altIdentifier/doi/10.1017/aog.2018.27 info:eu-repo/semantics/altIdentifier/wos/000480289300010 info:eu-repo/grantAgreement/SNF/SNF-Förderungsprofessuren Stufe 2/157551 http://hdl.handle.net/20.500.11850/312814 doi:10.3929/ethz-b-000312814 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY Annals of Glaciology, 60 (79) calving crevasses mountain glaciers seismology info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2019 ftethz https://doi.org/20.500.11850/312814 https://doi.org/10.3929/ethz-b-000312814 https://doi.org/10.1017/aog.2018.27 2022-04-25T13:53:06Z Passive seismology allows measurement of the structure of glaciers and ice sheets. However, most techniques used so far in this context are based on horizontally homogeneous media where parameters vary only with depth (1-D approximations), which are appropriate only for a subset of glaciers. Here, we analyze seismic noise records from three different types of glaciers (plateau, valley and avalanching glacier) to characterize the influence of the glacier geometry on the seismic wavefield. Using horizontal-to-vertical spectral ratios, polarization analysis and modal analysis, we show that the plateau glacier and the valley glacier can be seen as 1-D, whereas the relatively small avalanching glacier shows 3-D effects due to its bed topography and the deep crevasses. In principle, the techniques proposed here might allow monitoring such crevasses and their depth, and thus to constrain a key parameter of avalanching and calving glacier fronts. ISSN:0260-3055 ISSN:1727-5644 Article in Journal/Newspaper Annals of Glaciology ETH Zürich Research Collection |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
calving crevasses mountain glaciers seismology |
spellingShingle |
calving crevasses mountain glaciers seismology Preiswerk, Lukas Michel, Clotaire Walter, Fabian Fäh, Donat Effects of geometry on the seismic wavefield of Alpine glaciers |
topic_facet |
calving crevasses mountain glaciers seismology |
description |
Passive seismology allows measurement of the structure of glaciers and ice sheets. However, most techniques used so far in this context are based on horizontally homogeneous media where parameters vary only with depth (1-D approximations), which are appropriate only for a subset of glaciers. Here, we analyze seismic noise records from three different types of glaciers (plateau, valley and avalanching glacier) to characterize the influence of the glacier geometry on the seismic wavefield. Using horizontal-to-vertical spectral ratios, polarization analysis and modal analysis, we show that the plateau glacier and the valley glacier can be seen as 1-D, whereas the relatively small avalanching glacier shows 3-D effects due to its bed topography and the deep crevasses. In principle, the techniques proposed here might allow monitoring such crevasses and their depth, and thus to constrain a key parameter of avalanching and calving glacier fronts. ISSN:0260-3055 ISSN:1727-5644 |
format |
Article in Journal/Newspaper |
author |
Preiswerk, Lukas Michel, Clotaire Walter, Fabian Fäh, Donat |
author_facet |
Preiswerk, Lukas Michel, Clotaire Walter, Fabian Fäh, Donat |
author_sort |
Preiswerk, Lukas |
title |
Effects of geometry on the seismic wavefield of Alpine glaciers |
title_short |
Effects of geometry on the seismic wavefield of Alpine glaciers |
title_full |
Effects of geometry on the seismic wavefield of Alpine glaciers |
title_fullStr |
Effects of geometry on the seismic wavefield of Alpine glaciers |
title_full_unstemmed |
Effects of geometry on the seismic wavefield of Alpine glaciers |
title_sort |
effects of geometry on the seismic wavefield of alpine glaciers |
publisher |
International Glaciological Society |
publishDate |
2019 |
url |
https://hdl.handle.net/20.500.11850/312814 https://doi.org/10.3929/ethz-b-000312814 |
genre |
Annals of Glaciology |
genre_facet |
Annals of Glaciology |
op_source |
Annals of Glaciology, 60 (79) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/aog.2018.27 info:eu-repo/semantics/altIdentifier/wos/000480289300010 info:eu-repo/grantAgreement/SNF/SNF-Förderungsprofessuren Stufe 2/157551 http://hdl.handle.net/20.500.11850/312814 doi:10.3929/ethz-b-000312814 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/312814 https://doi.org/10.3929/ethz-b-000312814 https://doi.org/10.1017/aog.2018.27 |
_version_ |
1766000766180392960 |