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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ftloughboroughun:oai:figshare.com:article/9484175 2023-05-15T15:07:01+02:00 The search for seismic signatures of movement at the glacier bed in a polythermal valley glacier Joseph A. Pomeroy Alex Brisbourne Jeffrey Evans David Graham 2013-01-01T00:00:00Z https://figshare.com/articles/journal_contribution/The_search_for_seismic_signatures_of_movement_at_the_glacier_bed_in_a_polythermal_valley_glacier/9484175 unknown 2134/13100 https://figshare.com/articles/journal_contribution/The_search_for_seismic_signatures_of_movement_at_the_glacier_bed_in_a_polythermal_valley_glacier/9484175 CC BY-NC-ND 4.0 CC-BY-NC-ND Atmospheric Sciences Geophysics Earth Sciences not elsewhere classified untagged Text Journal contribution 2013 ftloughboroughun 2022-01-01T20:32:07Z 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 Storglacia¨ren. 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. Other Non-Article Part of Journal/Newspaper Arctic Northern Sweden Tarfala ren Loughborough University: Figshare Arctic Tarfala ENVELOPE(18.608,18.608,67.914,67.914) |
institution |
Open Polar |
collection |
Loughborough University: Figshare |
op_collection_id |
ftloughboroughun |
language |
unknown |
topic |
Atmospheric Sciences Geophysics Earth Sciences not elsewhere classified untagged |
spellingShingle |
Atmospheric Sciences Geophysics Earth Sciences not elsewhere classified untagged Joseph A. Pomeroy Alex Brisbourne Jeffrey Evans David Graham The search for seismic signatures of movement at the glacier bed in a polythermal valley glacier |
topic_facet |
Atmospheric Sciences Geophysics Earth Sciences not elsewhere classified untagged |
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 Storglacia¨ren. 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 |
Other Non-Article Part of Journal/Newspaper |
author |
Joseph A. Pomeroy Alex Brisbourne Jeffrey Evans David Graham |
author_facet |
Joseph A. Pomeroy Alex Brisbourne Jeffrey Evans David Graham |
author_sort |
Joseph A. Pomeroy |
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 |
https://figshare.com/articles/journal_contribution/The_search_for_seismic_signatures_of_movement_at_the_glacier_bed_in_a_polythermal_valley_glacier/9484175 |
long_lat |
ENVELOPE(18.608,18.608,67.914,67.914) |
geographic |
Arctic Tarfala |
geographic_facet |
Arctic Tarfala |
genre |
Arctic Northern Sweden Tarfala ren |
genre_facet |
Arctic Northern Sweden Tarfala ren |
op_relation |
2134/13100 https://figshare.com/articles/journal_contribution/The_search_for_seismic_signatures_of_movement_at_the_glacier_bed_in_a_polythermal_valley_glacier/9484175 |
op_rights |
CC BY-NC-ND 4.0 |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766338588433186816 |