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 M., 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. DOI 10.1029/2010GL043158.

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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.

Document Type: Article
Keywords: Geophysics; NanTroSEIZE; Nankai subduction zone; Kumano forearc basin; wireline logging; stress orientations
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-JRG-B4 Submarine Hazards
Refereed: Yes
DOI etc.: 10.1029/2010GL043158
ISSN: 0094-8276
Projects: IODP
Date Deposited: 20 Apr 2011 13:10
Last Modified: 20 Jun 2017 12:57
URI: http://eprints.uni-kiel.de/id/eprint/11812

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