The search for seismic signatures of movement at the glacier bed in a polythermal valley glacier
A passive seismology experiment was conducted across the main overdeepening of Storglaciaren in the Tarfala valley, northern Sweden, to investigate the spatial and temporal distribution of basal microseismic waveforms in relation to known dynamics of this small polythermal sub-arctic glacier. The hi...
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ftnerc:oai:nora.nerc.ac.uk:502761 2023-05-15T13:29:45+02:00 The search for seismic signatures of movement at the glacier bed in a polythermal valley glacier Pomeroy, Joseph Brisbourne, Alex Evans, Jeffrey Graham, David 2013-06 text http://nora.nerc.ac.uk/id/eprint/502761/ https://nora.nerc.ac.uk/id/eprint/502761/1/Pomeroy%20et%20al%202013.pdf https://doi.org/10.3189/2013AoG64A203 en eng https://nora.nerc.ac.uk/id/eprint/502761/1/Pomeroy%20et%20al%202013.pdf Pomeroy, Joseph; Brisbourne, Alex orcid:0000-0002-9887-7120 Evans, Jeffrey; Graham, David. 2013 The search for seismic signatures of movement at the glacier bed in a polythermal valley glacier. Annals of Glaciology, 54 (64). 149-156. https://doi.org/10.3189/2013AoG64A203 <https://doi.org/10.3189/2013AoG64A203> Publication - Article PeerReviewed 2013 ftnerc https://doi.org/10.3189/2013AoG64A203 2023-02-04T19:37:29Z A passive seismology experiment was conducted across the main overdeepening of Storglaciaren in the Tarfala valley, northern Sweden, to investigate the spatial and temporal distribution of basal microseismic waveforms in relation to known dynamics of this small polythermal sub-arctic glacier. The high ablation rate made it difficult to keep geophones buried and well coupled to the glacier during the experiment and reduced the number of days of good-quality data collection. The characterization of typical and atypical waveforms showed that the dominant waveforms were from near-surface events such as crevassing. Waveforms resembling basal microseismic signals were very rare, and seldom observed on more than two seismic stations simultaneously. The analysis of waveforms, amplitudes and particle motions suggested a near-field origin for most events. Even though basal sliding is known to occur in the overdeepening, no convincing examples of basal waveforms were detected, suggesting basal microseismic signals are rare or difficult to detect beneath polythermal glaciers like Storglaciaren. We discuss the reasons for failing to locate basal signals, consider the origin of common waveforms and make recommendations for setting up passive seismology experiments on glaciers with high ablation rates. Article in Journal/Newspaper Annals of Glaciology Arctic Northern Sweden Tarfala Natural Environment Research Council: NERC Open Research Archive Arctic Tarfala ENVELOPE(18.608,18.608,67.914,67.914) Annals of Glaciology 54 64 149 156 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
A passive seismology experiment was conducted across the main overdeepening of Storglaciaren in the Tarfala valley, northern Sweden, to investigate the spatial and temporal distribution of basal microseismic waveforms in relation to known dynamics of this small polythermal sub-arctic glacier. The high ablation rate made it difficult to keep geophones buried and well coupled to the glacier during the experiment and reduced the number of days of good-quality data collection. The characterization of typical and atypical waveforms showed that the dominant waveforms were from near-surface events such as crevassing. Waveforms resembling basal microseismic signals were very rare, and seldom observed on more than two seismic stations simultaneously. The analysis of waveforms, amplitudes and particle motions suggested a near-field origin for most events. Even though basal sliding is known to occur in the overdeepening, no convincing examples of basal waveforms were detected, suggesting basal microseismic signals are rare or difficult to detect beneath polythermal glaciers like Storglaciaren. We discuss the reasons for failing to locate basal signals, consider the origin of common waveforms and make recommendations for setting up passive seismology experiments on glaciers with high ablation rates. |
format |
Article in Journal/Newspaper |
author |
Pomeroy, Joseph Brisbourne, Alex Evans, Jeffrey Graham, David |
spellingShingle |
Pomeroy, Joseph Brisbourne, Alex Evans, Jeffrey Graham, David The search for seismic signatures of movement at the glacier bed in a polythermal valley glacier |
author_facet |
Pomeroy, Joseph Brisbourne, Alex Evans, Jeffrey Graham, David |
author_sort |
Pomeroy, Joseph |
title |
The search for seismic signatures of movement at the glacier bed in a polythermal valley glacier |
title_short |
The search for seismic signatures of movement at the glacier bed in a polythermal valley glacier |
title_full |
The search for seismic signatures of movement at the glacier bed in a polythermal valley glacier |
title_fullStr |
The search for seismic signatures of movement at the glacier bed in a polythermal valley glacier |
title_full_unstemmed |
The search for seismic signatures of movement at the glacier bed in a polythermal valley glacier |
title_sort |
search for seismic signatures of movement at the glacier bed in a polythermal valley glacier |
publishDate |
2013 |
url |
http://nora.nerc.ac.uk/id/eprint/502761/ https://nora.nerc.ac.uk/id/eprint/502761/1/Pomeroy%20et%20al%202013.pdf https://doi.org/10.3189/2013AoG64A203 |
long_lat |
ENVELOPE(18.608,18.608,67.914,67.914) |
geographic |
Arctic Tarfala |
geographic_facet |
Arctic Tarfala |
genre |
Annals of Glaciology Arctic Northern Sweden Tarfala |
genre_facet |
Annals of Glaciology Arctic Northern Sweden Tarfala |
op_relation |
https://nora.nerc.ac.uk/id/eprint/502761/1/Pomeroy%20et%20al%202013.pdf Pomeroy, Joseph; Brisbourne, Alex orcid:0000-0002-9887-7120 Evans, Jeffrey; Graham, David. 2013 The search for seismic signatures of movement at the glacier bed in a polythermal valley glacier. Annals of Glaciology, 54 (64). 149-156. https://doi.org/10.3189/2013AoG64A203 <https://doi.org/10.3189/2013AoG64A203> |
op_doi |
https://doi.org/10.3189/2013AoG64A203 |
container_title |
Annals of Glaciology |
container_volume |
54 |
container_issue |
64 |
container_start_page |
149 |
op_container_end_page |
156 |
_version_ |
1766002651277819904 |