Present-day principal horizontal stress orientations in the Kumano forearc basin of the southwest Japan subduction zone determined from IODP NanTroSEIZE drilling Site C0009

Weiren Lin and Mai-Linh Doan and J. C. Moore and Lisa C. McNeill and Timothy B. Byrne and Takatoshi Ito and Demian Saffer and Marianne Conin and Masataka Kinoshita and Yoshinori Sanada and Kyaw Thu Moe and Eiichiro Araki and Harold Tobin and David Boutt and Yasuyuki Kano and Nicholas W. Hayman and Peter B. Flemings and Gary J. Huftile and Deniz Cukur and Christophe Buret and Anja M. Schleicher and Natalia Efimenko and Kuniyo Kawabata and David M. Buchs and Shijun Jiang and Koji Kameo and Keika Horiguchi and Thomas Wiersberg and Achim Kopf and Kazuya Kitada and Nobuhisa Eguchi and Sean Toczko and Kyoma Takahashi and Yukari Kido. ( 2010 )
in: GEOPHYSICAL RESEARCH LETTERS, 37:13 (L13303)

Abstract

A 1.6 km riser borehole was drilled at site C0009 of the NanTroSEIZE, in the center of the Kumano forearc basin, as a landward extension of previous drilling in the southwest Japan Nankai subduction zone. We determined principal horizontal stress orientations from analyses of borehole breakouts and drilling-induced tensile fractures by using wireline logging formation microresistivity images and caliper data. The maximum horizontal stress orientation at C0009 is approximately parallel to the convergence vector between the Philippine Sea plate and Japan, showing a slight difference with the stress orientation which is perpendicular to the plate boundary at previous NanTroSEIZE sites C0001, C0004 and C0006 but orthogonal to the stress orientation at site C0002, which is also in the Kumano forearc basin. These data show that horizontal stress orientations are not uniform in the forearc basin within the surveyed depth range and suggest that oblique plate motion is being partitioned into strike-slip and thrusting. In addition, the stress orientations at site C0009 rotate clockwise from basin sediments into the underlying accretionary prism. Citation: Lin, W., et al. (2010), Present-day principal horizontal stress orientations in the Kumano forearc basin of the southwest Japan subduction zone determined from IODP NanTroSEIZE drilling Site C0009, Geophys. Res. Lett., 37, L13303, doi:10.1029/2010GL043158.

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@ARTICLE{ISI:000279498700003,
    author = { Lin, Weiren and Doan, Mai-Linh and Moore, J. C. and McNeill, Lisa C. and Byrne, Timothy B. and Ito, Takatoshi and Saffer, Demian and Conin, Marianne and Kinoshita, Masataka and Sanada, Yoshinori and Moe, Kyaw Thu and Araki, Eiichiro and Tobin, Harold and Boutt, David and Kano, Yasuyuki and Hayman, Nicholas W. and Flemings, Peter B. and Huftile, Gary J. and Cukur, Deniz and Buret, Christophe and Schleicher, Anja M. and Efimenko, Natalia and Kawabata, Kuniyo and Buchs, David M. and Jiang, Shijun and Kameo, Koji and Horiguchi, Keika and Wiersberg, Thomas and Kopf, Achim and Kitada, Kazuya and Eguchi, Nobuhisa and Toczko, Sean and Takahashi, Kyoma and Kido, Yukari },
     title = { Present-day principal horizontal stress orientations in the Kumano forearc basin of the southwest Japan subduction zone determined from IODP NanTroSEIZE drilling Site C0009 },
     month = { "jul 2" },
   journal = { GEOPHYSICAL RESEARCH LETTERS },
    volume = { 37 },
    number = { 13 },
      year = { 2010 },
     pages = { L13303 },
      issn = { 0094-8276 },
       doi = { 10.1029/2010gl043158 },
  abstract = { A 1.6 km riser borehole was drilled at site C0009 of the NanTroSEIZE, in the center of the Kumano forearc basin, as a landward extension of previous drilling in the southwest Japan Nankai subduction zone. We determined principal horizontal stress orientations from analyses of borehole breakouts and drilling-induced tensile fractures by using wireline logging formation microresistivity images and caliper data. The maximum horizontal stress orientation at C0009 is approximately parallel to the convergence vector between the Philippine Sea plate and Japan, showing a slight difference with the stress orientation which is perpendicular to the plate boundary at previous NanTroSEIZE sites C0001, C0004 and C0006 but orthogonal to the stress orientation at site C0002, which is also in the Kumano forearc basin. These data show that horizontal stress orientations are not uniform in the forearc basin within the surveyed depth range and suggest that oblique plate motion is being partitioned into strike-slip and thrusting. In addition, the stress orientations at site C0009 rotate clockwise from basin sediments into the underlying accretionary prism. Citation: Lin, W., et al. (2010), Present-day principal horizontal stress orientations in the Kumano forearc basin of the southwest Japan subduction zone determined from IODP NanTroSEIZE drilling Site C0009, Geophys. Res. Lett., 37, L13303, doi:10.1029/2010GL043158. }
}