Recent seismicity on the Kerguelen islands
The Kerguelen archipelago, one of the largest oceanic archipelagos in the world, was built by an active hotspot interacting with a ridge between 110 and 40 million years ago; since then, the ridge has migrated over 1000~km away and the archipelago's volcanic activity has been steadily decreasin...
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Online Access: | https://hal.science/hal-04357098 https://hal.science/hal-04357098/document https://hal.science/hal-04357098/file/islandora_168593.pdf https://doi.org/10.26443/seismica.v2i2.285 |
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ftinsu:oai:HAL:hal-04357098v1 2024-04-14T08:14:19+00:00 Recent seismicity on the Kerguelen islands Lengliné, Olivier Rimpot, Joachim Maggi, Alessia Zigone, Dimitri Institut Terre Environnement Strasbourg (ITES) École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2023 https://hal.science/hal-04357098 https://hal.science/hal-04357098/document https://hal.science/hal-04357098/file/islandora_168593.pdf https://doi.org/10.26443/seismica.v2i2.285 en eng HAL CCSD McGill info:eu-repo/semantics/altIdentifier/doi/10.26443/seismica.v2i2.285 hal-04357098 https://hal.science/hal-04357098 https://hal.science/hal-04357098/document https://hal.science/hal-04357098/file/islandora_168593.pdf doi:10.26443/seismica.v2i2.285 info:eu-repo/semantics/OpenAccess ISSN: 2816-9387 Seismica https://hal.science/hal-04357098 Seismica, 2023, 2 (2), pp.285. ⟨10.26443/seismica.v2i2.285⟩ Hotspot Seismicity Volcanic Structure [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2023 ftinsu https://doi.org/10.26443/seismica.v2i2.285 2024-03-21T17:02:59Z The Kerguelen archipelago, one of the largest oceanic archipelagos in the world, was built by an active hotspot interacting with a ridge between 110 and 40 million years ago; since then, the ridge has migrated over 1000~km away and the archipelago's volcanic activity has been steadily decreasing. Despite the lack of recent active tectonics and the quiescent volcanism of the Kerguelen archipelago, there have been several observations of seismic events of unknown origin in its vicinity. The only seismic instrument within 1000~km of the archipelago was installed on Kerguelen's main island in the 1980's. In this study we apply modern earthquake detection techniques to the continuous waveforms recorded by this seismometer over the past 20 years. We reveal that the Kerguelen archipelago islands hosts an abundant seismicity. This seismicity exhibits swarm-like characteristics in several clusters while at other locations the earthquakes appear more steady over time. We locate most events near the largest icecap of the main island. We speculate that the origin of the earthquakes can be linked to residual volcanic, magmatic, or hydrothermal activity at depth, all of which can be favored by flexural stress caused by the documented fast retreat of icecap. This seismicity may also indicate that the Kerguelen hotspot shows signs of unrest. Article in Journal/Newspaper Kerguelen Islands Institut national des sciences de l'Univers: HAL-INSU Kerguelen Kerguelen Islands Main Island ENVELOPE(-38.220,-38.220,-54.007,-54.007) Seismica 2 2 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Hotspot Seismicity Volcanic Structure [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Hotspot Seismicity Volcanic Structure [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Lengliné, Olivier Rimpot, Joachim Maggi, Alessia Zigone, Dimitri Recent seismicity on the Kerguelen islands |
topic_facet |
Hotspot Seismicity Volcanic Structure [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
The Kerguelen archipelago, one of the largest oceanic archipelagos in the world, was built by an active hotspot interacting with a ridge between 110 and 40 million years ago; since then, the ridge has migrated over 1000~km away and the archipelago's volcanic activity has been steadily decreasing. Despite the lack of recent active tectonics and the quiescent volcanism of the Kerguelen archipelago, there have been several observations of seismic events of unknown origin in its vicinity. The only seismic instrument within 1000~km of the archipelago was installed on Kerguelen's main island in the 1980's. In this study we apply modern earthquake detection techniques to the continuous waveforms recorded by this seismometer over the past 20 years. We reveal that the Kerguelen archipelago islands hosts an abundant seismicity. This seismicity exhibits swarm-like characteristics in several clusters while at other locations the earthquakes appear more steady over time. We locate most events near the largest icecap of the main island. We speculate that the origin of the earthquakes can be linked to residual volcanic, magmatic, or hydrothermal activity at depth, all of which can be favored by flexural stress caused by the documented fast retreat of icecap. This seismicity may also indicate that the Kerguelen hotspot shows signs of unrest. |
author2 |
Institut Terre Environnement Strasbourg (ITES) École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Lengliné, Olivier Rimpot, Joachim Maggi, Alessia Zigone, Dimitri |
author_facet |
Lengliné, Olivier Rimpot, Joachim Maggi, Alessia Zigone, Dimitri |
author_sort |
Lengliné, Olivier |
title |
Recent seismicity on the Kerguelen islands |
title_short |
Recent seismicity on the Kerguelen islands |
title_full |
Recent seismicity on the Kerguelen islands |
title_fullStr |
Recent seismicity on the Kerguelen islands |
title_full_unstemmed |
Recent seismicity on the Kerguelen islands |
title_sort |
recent seismicity on the kerguelen islands |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04357098 https://hal.science/hal-04357098/document https://hal.science/hal-04357098/file/islandora_168593.pdf https://doi.org/10.26443/seismica.v2i2.285 |
long_lat |
ENVELOPE(-38.220,-38.220,-54.007,-54.007) |
geographic |
Kerguelen Kerguelen Islands Main Island |
geographic_facet |
Kerguelen Kerguelen Islands Main Island |
genre |
Kerguelen Islands |
genre_facet |
Kerguelen Islands |
op_source |
ISSN: 2816-9387 Seismica https://hal.science/hal-04357098 Seismica, 2023, 2 (2), pp.285. ⟨10.26443/seismica.v2i2.285⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.26443/seismica.v2i2.285 hal-04357098 https://hal.science/hal-04357098 https://hal.science/hal-04357098/document https://hal.science/hal-04357098/file/islandora_168593.pdf doi:10.26443/seismica.v2i2.285 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.26443/seismica.v2i2.285 |
container_title |
Seismica |
container_volume |
2 |
container_issue |
2 |
_version_ |
1796312501207433216 |