Wind-induced seismic noise at the Princess Elisabeth Antarctica Station
Icequakes are the result of processes occurring within the ice mass or between the ice and its environment. Studying icequakes provides a unique view on ice dynamics, specifically on the basal conditions. Changes in conditions due to environmental or climate changes are reflected in icequakes. Count...
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ftdoajarticles:oai:doaj.org/article:1437b9c388fa44ffbcf018f99680060f 2023-05-15T13:51:08+02:00 Wind-induced seismic noise at the Princess Elisabeth Antarctica Station B. Frankinet T. Lecocq T. Camelbeeck 2021-10-01T00:00:00Z https://doi.org/10.5194/tc-15-5007-2021 https://doaj.org/article/1437b9c388fa44ffbcf018f99680060f EN eng Copernicus Publications https://tc.copernicus.org/articles/15/5007/2021/tc-15-5007-2021.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-15-5007-2021 1994-0416 1994-0424 https://doaj.org/article/1437b9c388fa44ffbcf018f99680060f The Cryosphere, Vol 15, Pp 5007-5016 (2021) Environmental sciences GE1-350 Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.5194/tc-15-5007-2021 2022-12-31T07:43:04Z Icequakes are the result of processes occurring within the ice mass or between the ice and its environment. Studying icequakes provides a unique view on ice dynamics, specifically on the basal conditions. Changes in conditions due to environmental or climate changes are reflected in icequakes. Counting and characterizing icequakes is thus essential to monitor them. Most of the icequakes recorded by the seismic station at the Belgian Princess Elisabeth Antarctica Station (PE) have small amplitudes corresponding to maximal displacements of a few nanometres. Their detection threshold is highly variable because of the rapid and strong changes in the local seismic noise level. Therefore, we evaluated the influence of katabatic winds on the noise measured by the well-protected PE surface seismometer. Our purpose is to identify whether the lack of icequake detection during some periods could be associated with variations in the processes generating them or simply with a stronger seismic noise linked to stronger wind conditions. We observed that the wind mainly influences seismic noise at frequencies greater than 1 Hz. The seismic noise power exhibits a bilinear correlation with the wind velocity, with two different slopes at a wind velocity lower and greater than 6 m s −1 and with, for example at a period of 0.26 s, a respective variation of 0.4 dB (m −1 s) and 1.4 dB (m −1 s). These results allowed a synthetic frequency and wind-speed-dependent noise model to be presented that explains the behaviour of the wind-induced seismic noise at PE, which shows that seismic noise amplitude increases exponentially with increasing wind speed. This model enables us to study the influence of the wind on the original seismic dataset, which improves the observation of cryoseismic activity near the PE station. Article in Journal/Newspaper Antarc* Antarctica The Cryosphere Directory of Open Access Journals: DOAJ Articles The Cryosphere 15 10 5007 5016 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 B. Frankinet T. Lecocq T. Camelbeeck Wind-induced seismic noise at the Princess Elisabeth Antarctica Station |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Icequakes are the result of processes occurring within the ice mass or between the ice and its environment. Studying icequakes provides a unique view on ice dynamics, specifically on the basal conditions. Changes in conditions due to environmental or climate changes are reflected in icequakes. Counting and characterizing icequakes is thus essential to monitor them. Most of the icequakes recorded by the seismic station at the Belgian Princess Elisabeth Antarctica Station (PE) have small amplitudes corresponding to maximal displacements of a few nanometres. Their detection threshold is highly variable because of the rapid and strong changes in the local seismic noise level. Therefore, we evaluated the influence of katabatic winds on the noise measured by the well-protected PE surface seismometer. Our purpose is to identify whether the lack of icequake detection during some periods could be associated with variations in the processes generating them or simply with a stronger seismic noise linked to stronger wind conditions. We observed that the wind mainly influences seismic noise at frequencies greater than 1 Hz. The seismic noise power exhibits a bilinear correlation with the wind velocity, with two different slopes at a wind velocity lower and greater than 6 m s −1 and with, for example at a period of 0.26 s, a respective variation of 0.4 dB (m −1 s) and 1.4 dB (m −1 s). These results allowed a synthetic frequency and wind-speed-dependent noise model to be presented that explains the behaviour of the wind-induced seismic noise at PE, which shows that seismic noise amplitude increases exponentially with increasing wind speed. This model enables us to study the influence of the wind on the original seismic dataset, which improves the observation of cryoseismic activity near the PE station. |
format |
Article in Journal/Newspaper |
author |
B. Frankinet T. Lecocq T. Camelbeeck |
author_facet |
B. Frankinet T. Lecocq T. Camelbeeck |
author_sort |
B. Frankinet |
title |
Wind-induced seismic noise at the Princess Elisabeth Antarctica Station |
title_short |
Wind-induced seismic noise at the Princess Elisabeth Antarctica Station |
title_full |
Wind-induced seismic noise at the Princess Elisabeth Antarctica Station |
title_fullStr |
Wind-induced seismic noise at the Princess Elisabeth Antarctica Station |
title_full_unstemmed |
Wind-induced seismic noise at the Princess Elisabeth Antarctica Station |
title_sort |
wind-induced seismic noise at the princess elisabeth antarctica station |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-15-5007-2021 https://doaj.org/article/1437b9c388fa44ffbcf018f99680060f |
genre |
Antarc* Antarctica The Cryosphere |
genre_facet |
Antarc* Antarctica The Cryosphere |
op_source |
The Cryosphere, Vol 15, Pp 5007-5016 (2021) |
op_relation |
https://tc.copernicus.org/articles/15/5007/2021/tc-15-5007-2021.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 doi:10.5194/tc-15-5007-2021 1994-0416 1994-0424 https://doaj.org/article/1437b9c388fa44ffbcf018f99680060f |
op_doi |
https://doi.org/10.5194/tc-15-5007-2021 |
container_title |
The Cryosphere |
container_volume |
15 |
container_issue |
10 |
container_start_page |
5007 |
op_container_end_page |
5016 |
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1766254734399766528 |