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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

Lin, Weiren, Doan, Mai-Linh, Moore, J. Casey, McNeill, Lisa, Byrne, Timothy B., Ito, Takatoshi, Saffer, Demian, Conin, Marianne, Kinoshita, Masataka, Sanada, Yoshinori, Moe, Kyaw Thu, Araki, Eiichiro, Tobin, Harold, Boutt, David, Kano, Yasuyuki, Hayman, Nicholas W., Flemings, Peter, Huftile, Gary J., Cukur, Deniz, Buret, Christophe, Schleicher, Anja M., Efimenko, Natalia, Kawabata, Kuniyo, Buchs, David, Jiang, Shijun, Kameo, Koji, Horiguchi, Keika, Wiersberg, Thomas, Kopf, Achim, Kitada, Kazuya, Eguchi, Nobuhisa, Toczko, Sean, Takahashi, Kyoma and Kido, Yukari 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. Geophysical Research Letters 37 (13) , L13303. 10.1029/2010GL043158

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Abstract

[1] 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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Uncontrolled Keywords: stress orientation; Kumano Forearc Basin; NanTroSEIZE; IODP
Additional Information: Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0094-8276/ (accessed 20/02/2014).
Publisher: American Geophysical Union
ISSN: 0094-8276
Date of First Compliant Deposit: 30 March 2016
Last Modified: 04 Jun 2017 04:46
URI: http://orca-mwe.cf.ac.uk/id/eprint/44363

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