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Opal-CT in chert beneath the toe of the Tohoku margin and its influence on the seismic aseismic transition in subduction zones

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タイトル: Opal-CT in chert beneath the toe of the Tohoku margin and its influence on the seismic aseismic transition in subduction zones
著者: Kameda, Jun 著作を一覧する
Okamoto, Atsushi 著作を一覧する
Sato, Kiminori 著作を一覧する
Fujimoto, Koichiro 著作を一覧する
Yamaguchi, Asuka 著作を一覧する
Kimura, Gaku 著作を一覧する
キーワード: chert
pressure solution creep
asperity
発行日: 2017年 1月28日
出版者: American Geophysical Union
誌名: Geophysical research letters
巻: 44
号: 2
開始ページ: 687
終了ページ: 693
出版社 DOI: 10.1002/2016GL071784
抄録: Thick accumulation of chert is a ubiquitous feature of old oceanic plates at convergent margins. In this study, we investigate chert fragments recovered by the Integrated Ocean Drilling Program expedition 343 at the Japan Trench where the 2011 Tohoku-Oki earthquake (M-w 9.0) occurred. This sample provides a unique opportunity to investigate in situ chert diagenesis at an active subduction margin and its influence on the kinematics of megathrust faulting. Our mineralogical analyses revealed that the chert is characterized by hydrous opal-CT and may therefore be highly deformable via pressure solution creep and readily accommodate shear strain between the converging plates at driving stresses of kilopascal order. As chert diagenesis advances, any further deformation requires stresses of >100MPa, given the increasing transport distances for solutes as represented in cherts on land. The chert diagenesis is thus related to the mechanical transition from a weakly to strongly coupled plate interface at this margin.
Rights: An edited version of this paper was published by AGU. Copyright 2017 American Geophysical Union. Kameda, J., A. Okamoto, K. Sato, K. Fujimoto, A. Yamaguchi, and G. Kimura (2017), Opal-CT in chert beneath the toe of the Tohoku margin and its influence on the seismic aseismic transition in subduction zones, Geophys. Res. Lett., 44, 687–693, doi:10.1002/2016GL071784. To view the published open abstract, go to http://dx.doi.org and enter the DOI.
資料タイプ: article
URI: http://hdl.handle.net/2115/66866
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 亀田 純

 

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