Origin of the seismic belt in the San-in district, southwest Japan, inferred from the seismic velocity structure of the lower crust

• 資料種別: 記事
• タイトル: Origin of the seismic belt in the San-in district, southwest Japan, inferred from the seismic velocity structure of the lower crust
• 著者・編者: Hiroo Tsuda; Yoshihisa Iio; Takuo Shibutani
• 出版事項: 日本 : Springer Nature
• 出版年月日等: 2019-10-25
• 出版年（W3CDTF）: 2019-10-25
• タイトル（掲載誌）: EPS : Earth, Planets and Space
• 巻号年月日等（掲載誌）: 71(109)
• 掲載巻: 71(109)
• ISSN（掲載誌）: 1880-5981
• ISSN-L（掲載誌）: 1343-8832
• 本文の言語コード: eng
• DOI: 10.1186/s40623-019-1091-x; https://doi.org/10.1186/s40623-019-1091-x
• 国立国会図書館永続的識別子: info:ndljp/pid/11467654; https://dl.ndl.go.jp/pid/11467654
• コレクション（共通）: 障害者向け資料
• コレクション（障害者向け資料：レベル1）: テキストデータ
• コレクション（個別）: 国立国会図書館デジタルコレクション > 電子書籍・電子雑誌 > その他; https://dl.ndl.go.jp/collections/B00035
• 収集根拠: オンライン資料収集制度
• 受理日（W3CDTF）: 2020-03-23T18:58:42+09:00
• 保存日（W3CDTF）: 2020-03-23
• 記録形式（IMT）: application/pdf
• オンライン閲覧公開範囲: 国立国会図書館内限定公開
• デジタル化資料送信: 図書館・個人送信対象外
• 遠隔複写可否（NDL）: 可
• 掲載誌（URI）: https://earth-planets-space.springeropen.com/articles
• 掲載誌（国立国会図書館永続的識別子）: info:ndljp/pid/11245705; https://dl.ndl.go.jp/pid/11245705
• 連携機関・データベース: 国立国会図書館 : 国立国会図書館デジタルコレクション; https://dl.ndl.go.jp

• 要約等: A long linear distribution of epicenters is seen along the Japan Sea coast in the San-in district located in southwestern Japan. This linear distribution of epicenters is called the seismic belt in the San-in district. The localization of intraplate earthquakes in the San-in district, far from plate boundaries, is not well understood. To answer this question, we look at the seismic velocity structure of the lower crust beneath the San-in district using seismic travel-time tomography. Our results show the existence of a low-velocity anomaly in the lower crust beneath the seismic belt. We infer that the deformation was concentrated in the low-velocity zone due to compressive stress caused by the subduction of oceanic plates, that stress concentration occurred just above the low-velocity zone, and that the seismic belt was therefore formed there. We also calculated the cutoff depths of shallow intraplate earthquakes in the San-in district. Based on the results, we consider the possible causes of the low-velocity anomaly in the lower crust beneath the seismic belt. We found that the cutoff depths of the intraplate earthquakes were shallower in the eastern part of the low-velocity zone in the lower crust beneath the seismic belt and deeper in the western part. Thus, the eastern part is likely to be hotter than the western part. We inferred that the eastern part was hot because a hot mantle upwelling approaches the Moho discontinuity below it and the resulting high temperature may be the main cause of the low-velocity anomaly. On the other hand, in the western part, we inferred that the temperature is not high because the mantle upwelling may not exist at shallow depth, and water dehydrated from the Philippine Sea plate reaches the lower crust, and the existence of this water may be the main cause of the low-velocity anomaly.
• DOI: 10.1186/s40623-019-1091-x; https://doi.org/10.1186/s40623-019-1091-x
• オンライン閲覧公開範囲: インターネット公開
• 著作権情報: © The Author(s) 2019 This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.
• 関連情報（URI）: http://hdl.handle.net/2433/246207; http://id.ndl.go.jp/digimeta/11467654; https://dl.ndl.go.jp/pid/11467654; http://link.springer.com/content/pdf/10.1186/s40623-019-1091-x.pdf; http://link.springer.com/article/10.1186/s40623-019-1091-x/fulltext.html
• 参照: The Advancement of Research on Inland Earthquake Generation 2014–2018; https://cir.nii.ac.jp/crid/1390283659860970112; Special issue "Crustal dynamics : toward integrated view of island arc seismogenesis; https://cir.nii.ac.jp/crid/2050870367078659712
• 連携機関・データベース: 国立情報学研究所 : CiNii Research; https://cir.nii.ac.jp/
• 提供元機関・データベース: 学術機関リポジトリデータベース; https://irdb.nii.ac.jp; 雑誌記事索引データベース; https://ndlsearch.ndl.go.jp; Crossref; https://www.crossref.org
• 書誌ID（NDLBibID）: 11467654; http://id.ndl.go.jp/bib/11467654