Relationship between tectonic tremors and 3-D distributions of thermal structure and dehydration in the Alaska subduction zone
Abstract The Alaska subduction zone is characterized by a subducting oceanic plateau, which is referred to as the Yakutat terrane. Tectonic tremors occur in this zone, and there are few volcanoes above the subducted Yakutat terrane. In this study, we performed a 3-D numerical simulation of a thermal...
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ftdoajarticles:oai:doaj.org/article:8e75236a3d9f440ba1e85393f106f0ee 2023-05-15T18:44:37+02:00 Relationship between tectonic tremors and 3-D distributions of thermal structure and dehydration in the Alaska subduction zone Kaya Iwamoto Nobuaki Suenaga Shoichi Yoshioka 2022-04-01T00:00:00Z https://doi.org/10.1038/s41598-022-10113-2 https://doaj.org/article/8e75236a3d9f440ba1e85393f106f0ee EN eng Nature Portfolio https://doi.org/10.1038/s41598-022-10113-2 https://doaj.org/toc/2045-2322 doi:10.1038/s41598-022-10113-2 2045-2322 https://doaj.org/article/8e75236a3d9f440ba1e85393f106f0ee Scientific Reports, Vol 12, Iss 1, Pp 1-11 (2022) Medicine R Science Q article 2022 ftdoajarticles https://doi.org/10.1038/s41598-022-10113-2 2022-12-31T00:05:02Z Abstract The Alaska subduction zone is characterized by a subducting oceanic plateau, which is referred to as the Yakutat terrane. Tectonic tremors occur in this zone, and there are few volcanoes above the subducted Yakutat terrane. In this study, we performed a 3-D numerical simulation of a thermal structure associated with the simultaneous subduction of the Yakutat terrane and Pacific plate to elucidate the mechanism of tectonic tremors, which typically involve the presence of water. We calculated the water content distribution near the slab surface by using the thermal structure obtained from our simulation and phase diagrams of the hydrous minerals included in the slab. As a result, dehydration from the marine sedimentary layer and oceanic crust was observed near the area where tectonic tremors occurred. Tectonic tremors occur only in the Yakutat terrane because the marine sedimentary layer and oceanic crust are thicker there, and the total amount of water content in these layers is higher; therefore, the amount of dehydration is also higher there than in the Pacific plate. Additionally, there are few volcanoes above the subducted Yakutat terrane because little water remains within the slab beneath the volcanic chain where magma is produced. Article in Journal/Newspaper Yakutat Alaska Directory of Open Access Journals: DOAJ Articles Pacific Scientific Reports 12 1 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
topic |
Medicine R Science Q |
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Medicine R Science Q Kaya Iwamoto Nobuaki Suenaga Shoichi Yoshioka Relationship between tectonic tremors and 3-D distributions of thermal structure and dehydration in the Alaska subduction zone |
topic_facet |
Medicine R Science Q |
description |
Abstract The Alaska subduction zone is characterized by a subducting oceanic plateau, which is referred to as the Yakutat terrane. Tectonic tremors occur in this zone, and there are few volcanoes above the subducted Yakutat terrane. In this study, we performed a 3-D numerical simulation of a thermal structure associated with the simultaneous subduction of the Yakutat terrane and Pacific plate to elucidate the mechanism of tectonic tremors, which typically involve the presence of water. We calculated the water content distribution near the slab surface by using the thermal structure obtained from our simulation and phase diagrams of the hydrous minerals included in the slab. As a result, dehydration from the marine sedimentary layer and oceanic crust was observed near the area where tectonic tremors occurred. Tectonic tremors occur only in the Yakutat terrane because the marine sedimentary layer and oceanic crust are thicker there, and the total amount of water content in these layers is higher; therefore, the amount of dehydration is also higher there than in the Pacific plate. Additionally, there are few volcanoes above the subducted Yakutat terrane because little water remains within the slab beneath the volcanic chain where magma is produced. |
format |
Article in Journal/Newspaper |
author |
Kaya Iwamoto Nobuaki Suenaga Shoichi Yoshioka |
author_facet |
Kaya Iwamoto Nobuaki Suenaga Shoichi Yoshioka |
author_sort |
Kaya Iwamoto |
title |
Relationship between tectonic tremors and 3-D distributions of thermal structure and dehydration in the Alaska subduction zone |
title_short |
Relationship between tectonic tremors and 3-D distributions of thermal structure and dehydration in the Alaska subduction zone |
title_full |
Relationship between tectonic tremors and 3-D distributions of thermal structure and dehydration in the Alaska subduction zone |
title_fullStr |
Relationship between tectonic tremors and 3-D distributions of thermal structure and dehydration in the Alaska subduction zone |
title_full_unstemmed |
Relationship between tectonic tremors and 3-D distributions of thermal structure and dehydration in the Alaska subduction zone |
title_sort |
relationship between tectonic tremors and 3-d distributions of thermal structure and dehydration in the alaska subduction zone |
publisher |
Nature Portfolio |
publishDate |
2022 |
url |
https://doi.org/10.1038/s41598-022-10113-2 https://doaj.org/article/8e75236a3d9f440ba1e85393f106f0ee |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Yakutat Alaska |
genre_facet |
Yakutat Alaska |
op_source |
Scientific Reports, Vol 12, Iss 1, Pp 1-11 (2022) |
op_relation |
https://doi.org/10.1038/s41598-022-10113-2 https://doaj.org/toc/2045-2322 doi:10.1038/s41598-022-10113-2 2045-2322 https://doaj.org/article/8e75236a3d9f440ba1e85393f106f0ee |
op_doi |
https://doi.org/10.1038/s41598-022-10113-2 |
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Scientific Reports |
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12 |
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1 |
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1766235409098997760 |