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, Mai Linh Doan, J. Casey Moore, Lisa McNeill, Timothy B. Byrne, Takatoshi Ito, Demian Saffer, Marianne Conin, Masataka Kinoshita, Yoshinori Sanada, Kyaw Thu Moe, Eiichiro Araki, Harold Tobin, David Boutt, Yasuyuki Kano, Nicholas W. Hayman, Peter Flemings, Gary J. Huftile, Deniz Cukur, Christophe BuretAnja M. Schleicher, Natalia Efimenko, Kuniyo Kawabata, David M. Buchs, Shijun Jiang, Koji Kameo, Keika Horiguchi, Thomas Wiersberg, Achim Kopf, Kazuya Kitada, Nobuhisa Eguchi, Sean Toczko, Kyoma Takahashi, Yukari Kido

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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.

Original languageEnglish (US)
Article numberL13303
JournalGeophysical Research Letters
Volume37
Issue number13
DOIs
StatePublished - Jul 1 2010

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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