Effects of geometry on the seismic wavefield of Alpine glaciers
ABSTRACT 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...
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Online Access: | http://dx.doi.org/10.1017/aog.2018.27 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305518000277 |
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crcambridgeupr:10.1017/aog.2018.27 2024-06-23T07:45:36+00:00 Effects of geometry on the seismic wavefield of Alpine glaciers Preiswerk, Lukas E. Michel, Clotaire Walter, Fabian Fäh, Donat 2018 http://dx.doi.org/10.1017/aog.2018.27 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305518000277 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Annals of Glaciology volume 60, issue 79, page 112-124 ISSN 0260-3055 1727-5644 journal-article 2018 crcambridgeupr https://doi.org/10.1017/aog.2018.27 2024-06-12T04:04:37Z ABSTRACT 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. Article in Journal/Newspaper Annals of Glaciology Cambridge University Press Annals of Glaciology 60 79 112 124 |
institution |
Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
ABSTRACT 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. |
format |
Article in Journal/Newspaper |
author |
Preiswerk, Lukas E. Michel, Clotaire Walter, Fabian Fäh, Donat |
spellingShingle |
Preiswerk, Lukas E. Michel, Clotaire Walter, Fabian Fäh, Donat Effects of geometry on the seismic wavefield of Alpine glaciers |
author_facet |
Preiswerk, Lukas E. Michel, Clotaire Walter, Fabian Fäh, Donat |
author_sort |
Preiswerk, Lukas E. |
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 |
Cambridge University Press (CUP) |
publishDate |
2018 |
url |
http://dx.doi.org/10.1017/aog.2018.27 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305518000277 |
genre |
Annals of Glaciology |
genre_facet |
Annals of Glaciology |
op_source |
Annals of Glaciology volume 60, issue 79, page 112-124 ISSN 0260-3055 1727-5644 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/aog.2018.27 |
container_title |
Annals of Glaciology |
container_volume |
60 |
container_issue |
79 |
container_start_page |
112 |
op_container_end_page |
124 |
_version_ |
1802641405853564928 |