Thermally induced icequakes detected on blue ice areas of the East Antarctic ice sheet
ABSTRACT Over a year of seismic observations, ~5000 short duration icequakes were detected by a permanent broadband station installed at the Princess Elisabeth base, located ~180 km inland in eastern Dronning Maud Land, East-Antarctica. Icequake detection via seismic waveform pattern recognition ind...
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crcambridgeupr:10.1017/aog.2019.26 2024-09-15T17:39:52+00:00 Thermally induced icequakes detected on blue ice areas of the East Antarctic ice sheet Lombardi, Denis Gorodetskaya, Irina Barruol, Guilhem Camelbeeck, Thierry 2019 http://dx.doi.org/10.1017/aog.2019.26 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305519000260 en eng Cambridge University Press (CUP) http://creativecommons.org/licenses/by/4.0/ Annals of Glaciology volume 60, issue 79, page 45-56 ISSN 0260-3055 1727-5644 journal-article 2019 crcambridgeupr https://doi.org/10.1017/aog.2019.26 2024-08-07T04:03:15Z ABSTRACT Over a year of seismic observations, ~5000 short duration icequakes were detected by a permanent broadband station installed at the Princess Elisabeth base, located ~180 km inland in eastern Dronning Maud Land, East-Antarctica. Icequake detection via seismic waveform pattern recognition indicates the presence of two dominating clusters of events, totalizing ~1500 icequakes. The corresponding icequake locations point towards two distinct zones of outcropping blue ice areas (BIAs) located respectively at 4 and 1 km from the seismic station, both on the leeward side of a nunatak protruding through the ice sheet. The temporal occurrence of these icequakes suggests a close genetic link with thermal contraction of ice caused by significant surface cooling controlled, in summer by variations in diurnal solar radiation and in winter by strong cooling during cold katabatic regimes. Further analysis demonstrates the dependence of these icequakes on the absolute surface temperature and on its temporal change. Besides providing information on the ice fracture mechanics and rheology, investigations of thermal icequakes may be regarded as a ground-based proxy for the monitoring of the thermal state of BIAs, and characterization of ice-sheet ablation zones. Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet Cambridge University Press Annals of Glaciology 60 79 45 56 |
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Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
description |
ABSTRACT Over a year of seismic observations, ~5000 short duration icequakes were detected by a permanent broadband station installed at the Princess Elisabeth base, located ~180 km inland in eastern Dronning Maud Land, East-Antarctica. Icequake detection via seismic waveform pattern recognition indicates the presence of two dominating clusters of events, totalizing ~1500 icequakes. The corresponding icequake locations point towards two distinct zones of outcropping blue ice areas (BIAs) located respectively at 4 and 1 km from the seismic station, both on the leeward side of a nunatak protruding through the ice sheet. The temporal occurrence of these icequakes suggests a close genetic link with thermal contraction of ice caused by significant surface cooling controlled, in summer by variations in diurnal solar radiation and in winter by strong cooling during cold katabatic regimes. Further analysis demonstrates the dependence of these icequakes on the absolute surface temperature and on its temporal change. Besides providing information on the ice fracture mechanics and rheology, investigations of thermal icequakes may be regarded as a ground-based proxy for the monitoring of the thermal state of BIAs, and characterization of ice-sheet ablation zones. |
format |
Article in Journal/Newspaper |
author |
Lombardi, Denis Gorodetskaya, Irina Barruol, Guilhem Camelbeeck, Thierry |
spellingShingle |
Lombardi, Denis Gorodetskaya, Irina Barruol, Guilhem Camelbeeck, Thierry Thermally induced icequakes detected on blue ice areas of the East Antarctic ice sheet |
author_facet |
Lombardi, Denis Gorodetskaya, Irina Barruol, Guilhem Camelbeeck, Thierry |
author_sort |
Lombardi, Denis |
title |
Thermally induced icequakes detected on blue ice areas of the East Antarctic ice sheet |
title_short |
Thermally induced icequakes detected on blue ice areas of the East Antarctic ice sheet |
title_full |
Thermally induced icequakes detected on blue ice areas of the East Antarctic ice sheet |
title_fullStr |
Thermally induced icequakes detected on blue ice areas of the East Antarctic ice sheet |
title_full_unstemmed |
Thermally induced icequakes detected on blue ice areas of the East Antarctic ice sheet |
title_sort |
thermally induced icequakes detected on blue ice areas of the east antarctic ice sheet |
publisher |
Cambridge University Press (CUP) |
publishDate |
2019 |
url |
http://dx.doi.org/10.1017/aog.2019.26 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0260305519000260 |
genre |
Annals of Glaciology Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet |
genre_facet |
Annals of Glaciology Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet |
op_source |
Annals of Glaciology volume 60, issue 79, page 45-56 ISSN 0260-3055 1727-5644 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/aog.2019.26 |
container_title |
Annals of Glaciology |
container_volume |
60 |
container_issue |
79 |
container_start_page |
45 |
op_container_end_page |
56 |
_version_ |
1810483093921857536 |