Distribution of stress state in the Nankai subduction zone, southwest Japan and a comparison with Japan Trench

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doi: 10.1016/j.tecto.2015.05.008
Author(s): Lin, Weiren; Byrne, Timothy B.; Kinoshita, Masataka; McNeill, Lisa C.; Chang, Chandong; Lewis, Jonathan C.; Yamamoto, Yuzuru; Saffer, Demian M.; Moore, J. Casey; 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 Affiliation(s): Primary:
Kyoto University, Graduate School of Engineering, Nankoku, Japan
University of Connecticut, United States
University of Tokyo, Japan
University of Southampton, United Kingdom
Chungnam National University, South Korea
Indiana University of Pennsylvania, United States
Japan Agency for Marine and Earth Science and Technology, Japan
Pennsylvania State University, United States
University of California at Santa Cruz, United States
Kyushu University, Japan
University of Lorraine, France
Tohoku University, Japan
University of Wisconsin at Madison, United States
Chiba University, Japan
University of Missouri at Columbia, United States
Volume Title: Geodynamics and environment in east Asia
Volume Author(s): Siame, Lionel L., editor; Lee, Jian-Cheng
Source: Tectonophysics, 692( Part B), p.120-130; GEEA 2014, Hualien, Taiwan, Nov. 12-18, 2014, edited by Lionel L. Siame and Jian-Cheng Lee. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0040-1951 CODEN: TCTOAM
Note: In English. 91 refs.; illus., incl. 1 table, sketch maps
Summary: 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 σ1 in the shallower levels (<∼1 km) is vertical from near the center of forearc basin to near the trench and; the maximum horizontal stress SHmax (interpreted to be the intermediate principal stress σ2) is generally parallel to the plate convergence vector. The exception to this generalization occurs along the shelf edge of the Nankai margin where SHmax 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 σ1 becoming 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 decollement and propagates to the toe (around site C0006).
Year of Publication: 2016
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; 19 Geophysics, Seismology; Active faults; Asia; Decollement; Earthquakes; Expeditions 343/343T; Extension tectonics; Far East; Faults; IODP Site C0006; IODP Site C0019; Integrated Ocean Drilling Program; Japan; Japan Trench; Japan Trench Fast Drilling Project; NanTroSEIZE; Nankai Trough; Neotectonics; North Pacific; Northwest Pacific; Ocean floors; Pacific Ocean; Plate tectonics; Propagation; Seismotectonics; Southwestern Japan; Stress fields; Subduction; Subduction zones; Tectonics; Tohoku-Oki earthquake 2011; Trenches; West Pacific
Coordinates: N330100 N330200 E1364800 E1364800
Record ID: 2017027707
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands