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Chester, F. M.; Mori, James; Toczko, S.; Eguchi, N.; Kido, Yukari; Saito, Saneatsu; Yukitoshi, Sanada; Anderson, L.; Behrmann, Jan H.; Bose, Santanu; Conin, Marianne; Cook, Becky; Fulton, P. M.; Hirose, Takehiro; Ikari, Matt J.; Ishikawa, Tadashi; Jeppson, T.; Kameda, J.; Kirkpatrick, Jamie; Lin, Weiren; Mishima, Tomokazu; Moore, J. Casey; Nakamura, Yasuyuki; Regalla, Christine; Remitti, Francesca; Rowe, C. D.; Sample, J. C.; Sun, Tianhaozhe; Takai, Ken; Toy, Virginia; Ujiie, Kohtaro; Wolfson, Monica

doi:10.2204/iodp.pr.343343t.2012

Cited by 48 publications

(23 citation statements)

References 37 publications

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“…The NanTroSEIZE project sampled and continues to monitor the characteristics of the seismogenic zone during the interseismic interval. In contrast, IODP expedition 343 to the Japan Trench (also referred to as the Japan Trench Fast Drilling Project or JFAST), was conducted just after a great earthquake, about 13 months after the 2011 Mw 9.0 Tohoku-Oki, Japan earthquake Chester et al, 2012;Fig. 1).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…To achieve these goals IODP expedition 343 conducted a rapid response drilling program about 13 months after the earthquake. The expedition successfully penetrated and sampled the frontal fault at a depth of ~820 mbsf at IODP Site C0019 where coseismic displacements were relatively large (~50 m) Chester et al, 2012). Site C0019 is located ~93 km seaward from the epicenter of the mainshock of the Tohoku-Oki earthquake and ~6 km landward of the trench axis ( Fig.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

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Distribution of stress state in the Nankai subduction zone, southwest Japan and a comparison with Japan Trench

et al. 2016

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Abstract:To better understand the distribution of three dimensional stress states in the Nankai subduction zone, southwest Japan, we review various stress-related investigations carried out in the first and second stage expeditions of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) by the Integrated Ocean Drilling Program (IODP) and compile the stress data. Overall, the maximum principal stress 1 in the shallower levels (<~1km) is vertical from near the center of forearc basin to near the trench and; the maximum horizontal stress SHmax (interpreted to be the intermediate principal stress 2) is generally parallel to the plate convergence vector. The exception to this generalization occurs along the shelf edge of the Nankai margin where SHmax is along strike rather than parallel to the plate convergence vector. Reorientation of the principal stresses at deeper levels (e.g., >~1km below seafloor or in underlying accretionary prism) with 1 becoming horizontal is also suggested at all deeper drilling sites. We also make a comparison of the stress state in the hanging wall of the frontal plate-interface between Site C0006 in the Nankai and Site C0019 in the Japan Trench subduction zone drilled after the 2011 Mw9.0 Tohoku-Oki earthquake. In the Japan Trench, the A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT3 comparison between stress state before and after the 2011 mega-earthquake shows that the stress changed from compression before the earthquake to extension after the earthquake. As a result of the comparison between the Nankai Trough and Japan Trench, a similar current stress state with trench parallel extension was recognized at both C0006 and C0019 sites. Hypothetically, this may indicate that in Nankai Trough it is still in an early stage of the interseismic cycle of a great earthquake which occurs on the décollement and propagates to the toe (around site C0006).

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Section: Accepted M Manuscriptmentioning

confidence: 99%

Distribution of stress state in the Nankai subduction zone, southwest Japan and a comparison with Japan Trench

et al. 2016

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“…Exponential fitting curves (dashed lines) and power-law fitting curves (solid lines) are shown. Yoshida and Kato (2011) assumed high pore pressure at greater depths, generated by continuous fluid flux from the underlying oceanic crust, and a permeability variation between the shallow and deep portions (Rice, 1992;David et al, 1994;Katayama et al, 2012). The model is generally acceptable because pore pressure can be mainly generated by fluid flux from depth (Tanikawa et al, 2008).…”

Section: Implication Of Dynamic Process For Tohoku Earthquakementioning

confidence: 99%

Fluid transport properties in sediments and their role in large slip near the surface of the plate boundary fault in the Japan Trench

Tanikawa

Hirose

Mukoyoshi

et al. 2013

Earth and Planetary Science Letters

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“…Drilling more than 800 mbsf in water depths over 6900 m was not an easy operation [13]. Various technical difficulties and equipment failures plagued the initial expedition (e.g.…”

Section: Japan Trench Fast Drilling Project (Jfast) (Iodp Exp 343 Anmentioning

confidence: 99%

“…Cuttings provided useful biostratigraphic control indicating that the age of coal bearing beds are younger than expected (Oligo-Miocene rather than expected Eocene). Mud-gas monitoring indicated that δC 13 of methane below 600 mbsf shows very light values, -60 to -80‰, suggesting continuous biogenic methane production up to temperatures reaching 60°C. Initial data for microbial cell abundance show extremely low counts below 1500 mbsf but higher counts are detected within coal beds [20].…”

Section: Deep Coalbed Biosphere Off Shimokita (Iodp Exp 337)mentioning

confidence: 99%

Recent scientific and operational achievements of D/V Chikyu

et al. 2014

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The D/V Chikyu, a scientific drilling vessel, is equipped with industry-standard riser capabilities. Riser drilling technology enables remarkable drilling and downhole logging capabilities and provides unprecedented hole-stability, enabling the shipboard team to retrieve high-quality wire-line logging data as well as well-preserved core samples. The 11 March 2011 Tohoku Oki mega-earthquake and tsunami cost over 18,000 casualties in NE Japan. Chikyu, docked in the Port of Hachinohe, was damaged by the tsunami. By April 2012, the ship was back in operation; drilling the toe of the Japan Trench fault zone where topographic surveys suggested there was up to 50 m eastward motion, the largest earthquake rupture ever recorded. During Integrated Ocean Drilling Program (IODP) Expeditions 343 and 343 T, Chikyu drilled 850 m below sea floor (mbsf) in 6,900+ m water depth and recovered core samples of a highly brecciated shear zone composed of pelagic claystone. A subseafloor observatory looking for temperature signatures caused by the fault friction during the earthquake, was installed and later successfully recovered. The recovered temperature loggers recorded data from which the level of friction during the mega-earthquake slip could be determined. Following Exp. 343, Chikyu began IODP Exp. 337, a riser drilling expedition into the Shimokita coal beds off Hachinohe, to study the deep subsurface biosphere in sedimentary units including Paleogene-Neogene coal beds. New records in scientific ocean drilling were achieved in deepest penetration (drilling reached 2,466 mbsf) and sample recovery. Currently Chikyu is conducting deep riser drilling at the Nankai Trough in the final stage of the NanTroSEIZE campaign. During the years 2011 to 2013, including drilling in the Okinawa Hydrothermal System, Chikyu's operational and scientific achievements have demonstrated that the ship's capabilities are vital for opening new frontiers in earth and biological sciences.

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Cited by 48 publications

References 37 publications

Distribution of stress state in the Nankai subduction zone, southwest Japan and a comparison with Japan Trench

Distribution of stress state in the Nankai subduction zone, southwest Japan and a comparison with Japan Trench

Fluid transport properties in sediments and their role in large slip near the surface of the plate boundary fault in the Japan Trench

Recent scientific and operational achievements of D/V Chikyu

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