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 theinteraction of ice with the underlying till or bedrock. Understanding this interaction is important forstudying basal sliding of glaciers and ice streams, a critical process in ice dynamics models used to con-...

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Published in:Annals of Glaciology
Main Authors: Hudson, Thomas S., Smith, Jonathan, Brisbourne, Alex M., White, Robert S.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press 2019
Subjects:
Online Access:http://nora.nerc.ac.uk/id/eprint/523470/
https://nora.nerc.ac.uk/id/eprint/523470/1/automated_detection_of_basal_icequakes_and_discrimination_from_surface_crevassing.pdf
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/D3BC005E0A3B71FF783CBC40AD90CBB6/S0260305519000181a.pdf/div-class-title-automated-detection-of-basal-icequakes-and-discrimination-from-surface-crevassing-div.pdf
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spelling ftnerc:oai:nora.nerc.ac.uk:523470 2023-05-15T13:29:45+02:00 Automated detection of basal icequakes and discrimination from surface crevassing Hudson, Thomas S. Smith, Jonathan Brisbourne, Alex M. White, Robert S. 2019-09 text http://nora.nerc.ac.uk/id/eprint/523470/ https://nora.nerc.ac.uk/id/eprint/523470/1/automated_detection_of_basal_icequakes_and_discrimination_from_surface_crevassing.pdf https://www.cambridge.org/core/services/aop-cambridge-core/content/view/D3BC005E0A3B71FF783CBC40AD90CBB6/S0260305519000181a.pdf/div-class-title-automated-detection-of-basal-icequakes-and-discrimination-from-surface-crevassing-div.pdf en eng Cambridge University Press https://nora.nerc.ac.uk/id/eprint/523470/1/automated_detection_of_basal_icequakes_and_discrimination_from_surface_crevassing.pdf Hudson, Thomas S. orcid:0000-0003-2944-883X Smith, Jonathan; Brisbourne, Alex M. orcid:0000-0002-9887-7120 White, Robert S. 2019 Automated detection of basal icequakes and discrimination from surface crevassing. Annals of Glaciology, 60 (79). 167-181. https://doi.org/10.1017/aog.2019.18 <https://doi.org/10.1017/aog.2019.18> cc_by_4 CC-BY Publication - Article PeerReviewed 2019 ftnerc https://doi.org/10.1017/aog.2019.18 2023-02-04T19:48:25Z Icequakes at or near the bed of a glacier have the potential to allow us to investigate theinteraction of ice with the underlying till or bedrock. Understanding this interaction is important forstudying basal sliding of glaciers and ice streams, a critical process in ice dynamics models used to con-strain future sea-level rise projections. However, seismic observations on glaciers can be dominated byseismic energy from surface crevassing. We present a method of automatically detecting basal icequakesand 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 theVatnajökull Ice Cap, South-East Iceland, to demonstrate that our method outperforms the commonlyused spectrum-based method. Our method detects a higher number of basal icequakes, has a lowerrate of incorrectly identifying crevassing as basal icequakes and detects an additional, spatially inde-pendent basal icequake cluster. We also show independently that the icequakes do not originate fromnear the glacier surface. We conclude that the method described here is more effective than currentlyimplemented methods for detecting and discriminating basal icequakes from surface crevassing. Article in Journal/Newspaper Annals of Glaciology glacier Ice cap Iceland Natural Environment Research Council: NERC Open Research Archive Annals of Glaciology 60 79 167 181
institution Open Polar
collection Natural Environment Research Council: NERC Open Research Archive
op_collection_id ftnerc
language English
description Icequakes at or near the bed of a glacier have the potential to allow us to investigate theinteraction of ice with the underlying till or bedrock. Understanding this interaction is important forstudying basal sliding of glaciers and ice streams, a critical process in ice dynamics models used to con-strain future sea-level rise projections. However, seismic observations on glaciers can be dominated byseismic energy from surface crevassing. We present a method of automatically detecting basal icequakesand 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 theVatnajökull Ice Cap, South-East Iceland, to demonstrate that our method outperforms the commonlyused spectrum-based method. Our method detects a higher number of basal icequakes, has a lowerrate of incorrectly identifying crevassing as basal icequakes and detects an additional, spatially inde-pendent basal icequake cluster. We also show independently that the icequakes do not originate fromnear the glacier surface. We conclude that the method described here is more effective than currentlyimplemented methods for detecting and discriminating basal icequakes from surface crevassing.
format Article in Journal/Newspaper
author Hudson, Thomas S.
Smith, Jonathan
Brisbourne, Alex M.
White, Robert S.
spellingShingle Hudson, Thomas S.
Smith, Jonathan
Brisbourne, Alex M.
White, Robert S.
Automated detection of basal icequakes and discrimination from surface crevassing
author_facet Hudson, Thomas S.
Smith, Jonathan
Brisbourne, Alex M.
White, Robert S.
author_sort Hudson, Thomas S.
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 http://nora.nerc.ac.uk/id/eprint/523470/
https://nora.nerc.ac.uk/id/eprint/523470/1/automated_detection_of_basal_icequakes_and_discrimination_from_surface_crevassing.pdf
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/D3BC005E0A3B71FF783CBC40AD90CBB6/S0260305519000181a.pdf/div-class-title-automated-detection-of-basal-icequakes-and-discrimination-from-surface-crevassing-div.pdf
genre Annals of Glaciology
glacier
Ice cap
Iceland
genre_facet Annals of Glaciology
glacier
Ice cap
Iceland
op_relation https://nora.nerc.ac.uk/id/eprint/523470/1/automated_detection_of_basal_icequakes_and_discrimination_from_surface_crevassing.pdf
Hudson, Thomas S. orcid:0000-0003-2944-883X
Smith, Jonathan; Brisbourne, Alex M. orcid:0000-0002-9887-7120
White, Robert S. 2019 Automated detection of basal icequakes and discrimination from surface crevassing. Annals of Glaciology, 60 (79). 167-181. https://doi.org/10.1017/aog.2019.18 <https://doi.org/10.1017/aog.2019.18>
op_rights cc_by_4
op_rightsnorm CC-BY
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
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