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Title: Mechanism of subsidence of the Northeast Japan forearc during the late period of a gigantic earthquake cycle
Authors: Sasajima, Ryohei
Shibazaki, Bunichiro
Iwamori, Hikaru
Nishimura, Takuya  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-2469-8146 (unconfirmed)
Nakai, Yoshihiko
Author's alias: 篠島, 僚平
芝崎, 文一郎
岩森, 光
西村, 卓也
中井, 仁彦
Keywords: Geodynamics
Seismology
Issue Date: 5-Apr-2019
Publisher: Springer Nature
Journal title: Scientific Reports
Volume: 9
Thesis number: 5726
Abstract: The forearc in Northeast Japan subsided (3–4 mm/year) in the interseismic ~100 years before the 2011 Tohoku earthquake (MW9.1) just like it did during this event. This study attempts to understand the mechanism of the vertical displacement of the forearc during gigantic earthquake cycles via numerical modeling. The results suggest that the interseismic subsidence rate in the forearc increases with the duration of the locking of the asperity of the gigantic earthquake over several hundred years, due to the increasing slip deficit rate on the deeper parts of the plate interface. The increasing slip deficit rate is caused by both the decreasing the shear stress in the shear zone owing to the continuous locking of the asperity and the increasing the mobility of the continental lithosphere owing to the viscoelastic relaxation in the mantle wedge. The deep slip deficit rate extending to ~100 km depth of the plate interface is necessary to explain the observed interseismic forearc subsidence rate. The results also suggest hundreds of years of continuous locking of the asperities of a gigantic earthquake in the western Kuril subduction zone, where fast forearc subsidence has been observed as well.
Description: 東北地方太平洋沿岸域が沈降するメカニズムを解明 --超巨大地震サイクル後半の沈降速度の増加--. 京都大学プレスリリース. 2019-04-09.
Rights: © The Author(s) 2019. 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/2433/240766
DOI(Published Version): 10.1038/s41598-019-42169-y
PubMed ID: 30952917
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2019-04-09
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