Automated detection of basal icequakes and discrimination from surface crevassing
Icequakes at or near the bed of a glacier have the potential to allow us to investigate the interaction of ice with the underlying till or bedrock. Understanding this interaction is important for studying basal sliding of glaciers and ice streams, a critical process in ice dynamics models used to co...
Published in: | Annals of Glaciology |
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Cambridge University Press
2019
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Online Access: | https://doi.org/10.1017/aog.2019.18 https://doaj.org/article/6862e66372ba468590fbaf78634e74cc |
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ftdoajarticles:oai:doaj.org/article:6862e66372ba468590fbaf78634e74cc 2023-05-15T13:29:33+02:00 Automated detection of basal icequakes and discrimination from surface crevassing Thomas S. Hudson Jonathan Smith Alex M. Brisbourne Robert S. White 2019-09-01T00:00:00Z https://doi.org/10.1017/aog.2019.18 https://doaj.org/article/6862e66372ba468590fbaf78634e74cc EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0260305519000181/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2019.18 0260-3055 1727-5644 https://doaj.org/article/6862e66372ba468590fbaf78634e74cc Annals of Glaciology, Vol 60, Pp 167-181 (2019) crevasses glacier geophysics ice dynamics seismology subglacial processes Meteorology. Climatology QC851-999 article 2019 ftdoajarticles https://doi.org/10.1017/aog.2019.18 2023-03-12T01:31:55Z Icequakes at or near the bed of a glacier have the potential to allow us to investigate the interaction of ice with the underlying till or bedrock. Understanding this interaction is important for studying basal sliding of glaciers and ice streams, a critical process in ice dynamics models used to constrain future sea-level rise projections. However, seismic observations on glaciers can be dominated by seismic energy from surface crevassing. We present a method of automatically detecting basal icequakes and discriminating them from surface crevassing, comparing this method to a commonly used spectrum-based method of detecting icequakes. We use data from Skeidararjökull, an outlet glacier of the Vatnajökull Ice Cap, South-East Iceland, to demonstrate that our method outperforms the commonly used spectrum-based method. Our method detects a higher number of basal icequakes, has a lower rate of incorrectly identifying crevassing as basal icequakes and detects an additional, spatially independent basal icequake cluster. We also show independently that the icequakes do not originate from near the glacier surface. We conclude that the method described here is more effective than currently implemented methods for detecting and discriminating basal icequakes from surface crevassing. Article in Journal/Newspaper Annals of Glaciology glacier Ice cap Iceland Vatnajökull Directory of Open Access Journals: DOAJ Articles Vatnajökull ENVELOPE(-16.823,-16.823,64.420,64.420) Annals of Glaciology 60 79 167 181 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
crevasses glacier geophysics ice dynamics seismology subglacial processes Meteorology. Climatology QC851-999 |
spellingShingle |
crevasses glacier geophysics ice dynamics seismology subglacial processes Meteorology. Climatology QC851-999 Thomas S. Hudson Jonathan Smith Alex M. Brisbourne Robert S. White Automated detection of basal icequakes and discrimination from surface crevassing |
topic_facet |
crevasses glacier geophysics ice dynamics seismology subglacial processes Meteorology. Climatology QC851-999 |
description |
Icequakes at or near the bed of a glacier have the potential to allow us to investigate the interaction of ice with the underlying till or bedrock. Understanding this interaction is important for studying basal sliding of glaciers and ice streams, a critical process in ice dynamics models used to constrain future sea-level rise projections. However, seismic observations on glaciers can be dominated by seismic energy from surface crevassing. We present a method of automatically detecting basal icequakes and discriminating them from surface crevassing, comparing this method to a commonly used spectrum-based method of detecting icequakes. We use data from Skeidararjökull, an outlet glacier of the Vatnajökull Ice Cap, South-East Iceland, to demonstrate that our method outperforms the commonly used spectrum-based method. Our method detects a higher number of basal icequakes, has a lower rate of incorrectly identifying crevassing as basal icequakes and detects an additional, spatially independent basal icequake cluster. We also show independently that the icequakes do not originate from near the glacier surface. We conclude that the method described here is more effective than currently implemented methods for detecting and discriminating basal icequakes from surface crevassing. |
format |
Article in Journal/Newspaper |
author |
Thomas S. Hudson Jonathan Smith Alex M. Brisbourne Robert S. White |
author_facet |
Thomas S. Hudson Jonathan Smith Alex M. Brisbourne Robert S. White |
author_sort |
Thomas S. Hudson |
title |
Automated detection of basal icequakes and discrimination from surface crevassing |
title_short |
Automated detection of basal icequakes and discrimination from surface crevassing |
title_full |
Automated detection of basal icequakes and discrimination from surface crevassing |
title_fullStr |
Automated detection of basal icequakes and discrimination from surface crevassing |
title_full_unstemmed |
Automated detection of basal icequakes and discrimination from surface crevassing |
title_sort |
automated detection of basal icequakes and discrimination from surface crevassing |
publisher |
Cambridge University Press |
publishDate |
2019 |
url |
https://doi.org/10.1017/aog.2019.18 https://doaj.org/article/6862e66372ba468590fbaf78634e74cc |
long_lat |
ENVELOPE(-16.823,-16.823,64.420,64.420) |
geographic |
Vatnajökull |
geographic_facet |
Vatnajökull |
genre |
Annals of Glaciology glacier Ice cap Iceland Vatnajökull |
genre_facet |
Annals of Glaciology glacier Ice cap Iceland Vatnajökull |
op_source |
Annals of Glaciology, Vol 60, Pp 167-181 (2019) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0260305519000181/type/journal_article https://doaj.org/toc/0260-3055 https://doaj.org/toc/1727-5644 doi:10.1017/aog.2019.18 0260-3055 1727-5644 https://doaj.org/article/6862e66372ba468590fbaf78634e74cc |
op_doi |
https://doi.org/10.1017/aog.2019.18 |
container_title |
Annals of Glaciology |
container_volume |
60 |
container_issue |
79 |
container_start_page |
167 |
op_container_end_page |
181 |
_version_ |
1766001198441168896 |