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Title: Distribution of stress state in the Nankai subduction zone, southwest Japan and a comparison with Japan Trench
Authors: Lin, Weiren
Byrne, Timothy B.
Kinoshita, Masataka
McNeill, Lisa C.
Chang, Chandong
Lewis, Jonathan C.
Yamamoto, Yuzuru
Saffer, Demian M.
Casey Moore, J.
Wu, Hung-Yu
Tsuji, Takeshi
Yamada, Yasuhiro
Conin, Marianne
Saito, Saneatsu
Ito, Takatoshi
Tobin, Harold J.
Kimura, Gaku
Kanagawa, Kyuichi
Ashi, Juichiro
Underwood, Michael B.
Kanamatsu, Toshiya
Author's alias: 林, 為人
Keywords: Stress state
Nankai subduction zone
Japan Trench
Ocean drilling
Issue Date: 5-Dec-2016
Publisher: Elsevier BV
Journal title: Tectonophysics
Volume: 692
Issue: Part B
Start page: 120
End page: 130
Abstract: To better understand the distribution of three dimensional stress states in the Nankai subduction zone, southwest Japan, we review various stress-related investigations carried out in the first and second stage expeditions of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) by the Integrated Ocean Drilling Program (IODP) and compile the stress data. Overall, the maximum principal stress σ[1] in the shallower levels (<~1 km) is vertical from near the center of forearc basin to near the trench and; the maximum horizontal stress S[Hmax] (interpreted to be the intermediate principal stress σ[2]) is generally parallel to the plate convergence vector. The exception to this generalization occurs along the shelf edge of the Nankai margin where S[Hmax] is along strike rather than parallel to the plate convergence vector. Reorientation of the principal stresses at deeper levels (e.g., >~ 1 km below seafloor or in underlying accretionary prism) with σ1becoming horizontal is also suggested at all deeper drilling sites. We also make a comparison of the stress state in the hanging wall of the frontal plate-interface between Site C0006 in the Nankai and Site C0019 in the Japan Trench subduction zone drilled after the 2011 Mw 9.0 Tohoku-Oki earthquake. In the Japan Trench, a comparison between stress state before and after the 2011 mega-earthquake shows that the stress changed from compression before the earthquake to extension after the earthquake. As a result of the comparison between the Nankai Trough and Japan Trench, a similar current stress state with trench parallel extension was recognized at both C0006 and C0019 sites. Hypothetically, this may indicate that in Nankai Trough it is still in an early stage of the interseismic cycle of a great earthquake which occurs on the décollement and propagates to the toe (around site C0006).
Rights: © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
The full-text file will be made open to the public on 5 December 2018 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/225121
DOI(Published Version): 10.1016/j.tecto.2015.05.008
Appears in Collections:Journal Articles

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