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

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doi: 10.1029/2010GL043158
Author(s): 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; Kido, Yukari
Author Affiliation(s): Primary:
Japan Agancy for Marine-Earth Science and Technology, Kochi Institute for Core Sample Research, Nankoku, Japan
Université Joseph Fourier, France
University of California at Santa Cruz, United States
University of Southampton, United Kingdom
University of Connecticut, United States
Tohoku University, Japan
Pennsylvania State University, United States
University Aix Marseille III, France
University of Wisconsin-Madison, United States
University of Massachusetts at Amherst, United States
Kyoto University, Japan
University of Texas at Austin, United States
Queensland University of Technology, Australia
Kiel University, Germany
Université de Picardie Jules Verne, France
University of Michigan, United States
Université de Lausanne, Switzerland
National Central University, Taiwan
Australian National University, Australia
Florida State University, United States
Chiba University, Japan
Osaka University, Japan
German Research Center for Geosciences, Germany
University of Bremen, Germany
Volume Title: Geophysical Research Letters
Source: Geophysical Research Letters, 37(13). Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0094-8276 CODEN: GPRLAJ
Note: In English. 16 refs.; illus., incl. geol. sketch map, sects.
Summary: 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.
Year of Publication: 2010
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; Basins; Boreholes; Expedition 319; Fore-arc basins; Fractures; IODP Site C0009; Integrated Ocean Drilling Program; Kumano Basin; NanTroSEIZE; Nankai Trough; North Pacific; Northwest Pacific; Orientation; Pacific Ocean; Philippine Sea Plate; Plate boundaries; Plate tectonics; Rotation; Stress; Subduction zones; Well-logging; West Pacific
Coordinates: N325000 N333000 E1370000 E1362000
Record ID: 2011075832
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