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Ocean-bottom and surface seismometers reveal continuous glacial tremor and slip

Shearing along subduction zones, laboratory experiments on analogue faults, and sliding along glacier beds are all associated with aseismic and co-seismic slip. In this study, an ocean-bottom seismometer is deployed near the terminus of a Greenlandic tidewater glacier, effectively insulating the sig...

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Autores principales: Podolskiy, Evgeny A., Murai, Yoshio, Kanna, Naoya, Sugiyama, Shin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8225613/
https://www.ncbi.nlm.nih.gov/pubmed/34168146
http://dx.doi.org/10.1038/s41467-021-24142-4
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author Podolskiy, Evgeny A.
Murai, Yoshio
Kanna, Naoya
Sugiyama, Shin
author_facet Podolskiy, Evgeny A.
Murai, Yoshio
Kanna, Naoya
Sugiyama, Shin
author_sort Podolskiy, Evgeny A.
collection PubMed
description Shearing along subduction zones, laboratory experiments on analogue faults, and sliding along glacier beds are all associated with aseismic and co-seismic slip. In this study, an ocean-bottom seismometer is deployed near the terminus of a Greenlandic tidewater glacier, effectively insulating the signal from the extremely noisy surface seismic wavefield. Continuous, tide-modulated tremor related to ice speed is recorded at the bed of the glacier. When noise interference (for example, due to strong winds) is low, the tremor is also confirmed via analysis of seismic waveforms from surface stations. The signal resembles the tectonic tremor commonly observed during slow-earthquake events in subduction zones. We propose that the glacier sliding velocity can be retrieved from the observed seismic noise. Our approach may open new opportunities for monitoring calving-front processes in one of the most difficult-to-access cryospheric environments.
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spelling pubmed-82256132021-07-09 Ocean-bottom and surface seismometers reveal continuous glacial tremor and slip Podolskiy, Evgeny A. Murai, Yoshio Kanna, Naoya Sugiyama, Shin Nat Commun Article Shearing along subduction zones, laboratory experiments on analogue faults, and sliding along glacier beds are all associated with aseismic and co-seismic slip. In this study, an ocean-bottom seismometer is deployed near the terminus of a Greenlandic tidewater glacier, effectively insulating the signal from the extremely noisy surface seismic wavefield. Continuous, tide-modulated tremor related to ice speed is recorded at the bed of the glacier. When noise interference (for example, due to strong winds) is low, the tremor is also confirmed via analysis of seismic waveforms from surface stations. The signal resembles the tectonic tremor commonly observed during slow-earthquake events in subduction zones. We propose that the glacier sliding velocity can be retrieved from the observed seismic noise. Our approach may open new opportunities for monitoring calving-front processes in one of the most difficult-to-access cryospheric environments. Nature Publishing Group UK 2021-06-24 /pmc/articles/PMC8225613/ /pubmed/34168146 http://dx.doi.org/10.1038/s41467-021-24142-4 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Podolskiy, Evgeny A.
Murai, Yoshio
Kanna, Naoya
Sugiyama, Shin
Ocean-bottom and surface seismometers reveal continuous glacial tremor and slip
title Ocean-bottom and surface seismometers reveal continuous glacial tremor and slip
title_full Ocean-bottom and surface seismometers reveal continuous glacial tremor and slip
title_fullStr Ocean-bottom and surface seismometers reveal continuous glacial tremor and slip
title_full_unstemmed Ocean-bottom and surface seismometers reveal continuous glacial tremor and slip
title_short Ocean-bottom and surface seismometers reveal continuous glacial tremor and slip
title_sort ocean-bottom and surface seismometers reveal continuous glacial tremor and slip
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8225613/
https://www.ncbi.nlm.nih.gov/pubmed/34168146
http://dx.doi.org/10.1038/s41467-021-24142-4
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