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タイトル: Stress buildup and drop in inland shallow crust caused by the 2011 Tohoku-oki earthquake events
著者: Sakaguchi, Kiyotoshi
Yokoyama, Tatsuya
Lin, Weiren
Watanabe, Noriaki
著者名の別形: 坂口, 清敏
横山, 幸也
林, 為人
渡邉, 則昭
キーワード: Geodynamics
Seismology
Tectonics
発行日: 31-Aug-2017
出版者: Springer Nature
誌名: Scientific Reports
巻: 7
論文番号: 10242
抄録: To examine the change in stress between before and after the Tohoku-oki Mw9.0 earthquake, we performed stress measurements after the earthquake in the Kamaishi mine in Iwate prefecture in northern Japan, located near the northern termination of the mainshock rupture, following previous measurements before the earthquake in the same mine. The results showed that the magnitudes of the three-dimensional principal stresses and the vertical stress drastically increased after the mainshock and, at 1 year after the earthquake, were more than double those before the earthquake. The principal stress magnitudes then decreased with time and returned to almost pre-earthquake levels at about 3 years after the earthquake. These changes can be interpreted in terms of coseismic rupture of the mainshock and the occurrence of aftershocks in the Sanriku-oki low-seismicity region (SLSR), where the Kamaishi mine is located. The drastic increase in stress suggests that the SLSR may act as a barrier to further rupture propagation.
記述: 東北地方太平洋沖地震前後で地殻に加わった力の増減と余震との相関を実測で解明 --地下数百mでも地震すべり破壊挙動の理解は可能--. 京都大学プレスリリース. 2017-09-07.
著作権等: © The Author(s) 2017. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
URI: http://hdl.handle.net/2433/227015
DOI(出版社版): 10.1038/s41598-017-10897-8
関連リンク: http://www.kyoto-u.ac.jp/ja/research/research_results/2017/170831_4.html
出現コレクション:学術雑誌掲載論文等

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