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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 1 Mai-Linh Doan 2 J. Casey Moore 3 Lisa Mcneill 4 Timothy B. Byrne 5 Takatoshi Ito 6 Demian Saffer 7 Marianne Conin 8 Masataka Kinoshita 9 Yoshinori Sanada 10 Kyaw Thu Moe 10 Eiichiro Araki 9 Harold Tobin 11 David Boutt 12 Yasuyuki Kano 13 Nicholas W. Hayman 14 Peter Flemings 14 Gary J. Huftile 15 Deniz Cukur 16 Christophe Buret 17 Anja M. Schleicher 18 Natalia Efimenko 19 Kuniyo Kawabata 20 David M. Buchs 21 Shijun Jiang 22 Koji Kameo 23 Keika Horiguchi 24 Thomas Wiersberg 25 Achim Kopf 26 Kazuya Kitada 9 Nobuhisa Eguchi 10 Sean Toczko 10 Kyoma Takahashi 10 Yukari Kido 10
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.
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Submitted on : Thursday, February 10, 2011 - 6:47:55 PM
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Weiren Lin, Mai-Linh Doan, J. Casey Moore, Lisa Mcneill, Timothy B. Byrne, et al.. Present-day principal horizontal stress orientations in the Kumano forearc basin of the southwest Japan subduction zone determined from IODP NanTroSEIZE drilling Site C0009. Geophysical Research Letters, American Geophysical Union, 2010, 37, pp.13303. ⟨10.1029/2010GL043158⟩. ⟨insu-00565053⟩

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