In situ stress state from walkaround VSP anisotropy in the Kumano basin southeast of the Kii Peninsula, Japan

Tsuji, Takeshi; Hino, Ryota; Yukitoshi, Sanada; Yamamoto, Kiyohiko; Park, Jin Oh; No, Tetsuo; Araki, Eiichiro; Bangs, N. L.; Huene, Roland von; Moore, Gregory F.; Kinoshita, Masataka

doi:10.1029/2011gc003583

Cited by 22 publications

(19 citation statements)

References 36 publications

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“…[] (denoted by “2”, solid red circles), and estimated from seismic anisotropy by Tsuji et al . [] (denoted by “3”, red box) are also shown. The minimum horizontal stresses expected for slip on normal faults with an assumed friction coefficient ( μ ) of 0.4–0.6 (orange‐shaded area), μ = 0.1 (dashed line), and a uniaxial strain burial path for K 0 values of 0.5–0.6 (gray‐shaded area) are shown for reference.…”

Section: Resultsmentioning

confidence: 99%

In situ stress and pore pressure in the Kumano Forearc Basin, offshore SW Honshu from downhole measurements during riser drilling

Saffer

Flemings

Boutt

et al. 2013

Geochem Geophys Geosyst

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[1] In situ stress and pore pressure are key parameters governing rock deformation, yet direct measurements of these quantities are rare. During Integrated Ocean Drilling Program (IODP) Expedition #319, we drilled through a forearc basin at the Nankai subduction zone and into the underlying accretionary prism. We used the Modular Formation Dynamics Tester tool (MDT) for the first time in IODP to measure in situ minimum stress, pore pressure, and permeability at 11 depths between 729.9 and 1533.9 mbsf. Leak-off testing at 708.6 mbsf conducted as part of drilling operations provided a second measurement of minimum stress. The MDT campaign included nine single-probe (SP) tests to measure permeability and in situ pore pressure and two dual-packer (DP) tests to measure minimum principal stress. Permeabilities defined from the SP tests range from 6.53 Â 10 À17 to 4.23 Â 10 À14 m 2 . Pore fluid pressures are near hydrostatic throughout the section despite ©2013. American Geophysical Union. All Rights Reserved. 1454 rapid sedimentation. This is consistent with the measured hydraulic diffusivity of the sediments and suggests that the forearc basin should not trap overpressures within the upper plate of the subduction zone. Minimum principal stresses are consistently lower than the vertical stress. We estimate the maximum horizontal stress from wellbore failures at the leak-off test and shallow MDT DP test depths. The results indicate a normal or strike-slip stress regime, consistent with the observation of abundant active normal faults in the seaward-most part of the basin, and a general decrease in fault activity in the vicinity of Site C0009.Components: 10,203 words, 11 figures, 3 tables.Keywords: in situ stress; pore pressure; permeability; subduction zone; forearc basin.

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Section: Resultsmentioning

confidence: 99%

In situ stress and pore pressure in the Kumano Forearc Basin, offshore SW Honshu from downhole measurements during riser drilling

Saffer

Flemings

Boutt

et al. 2013

Geochem Geophys Geosyst

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“…Circular seismic surveys have been previously acquired at larger scales (e.g., to detect seismic anisotropy in oceanic crust and mantle; e.g., Stephen, 1985;Tsuji et al, 2011), but to our knowledge, such surveys have not been applied to address questions in CZ science. The approach is to acquire "circle shots" consisting of geophones deployed in a circle around a central shot point.…”

Section: Introductionmentioning

confidence: 99%

Mapping Inherited Fractures in the Critical Zone Using Seismic Anisotropy From Circular Surveys

Novitsky

Holbrook

Carr

et al. 2018

Geophysical Research Letters

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Weathering and hydrological processes in Earth's shallow subsurface are influenced by inherited bedrock structures, such as bedding planes, faults, joints, and fractures. However, these structures are difficult to observe in soil‐mantled landscapes. Steeply dipping structures with a dominant orientation are detectable by seismic anisotropy, with fast wave speeds along the strike of structures. We measured shallow (~2–4 m) seismic anisotropy using “circle shots,” geophones deployed in a circle around a central shot point, in a weathered granite terrain in the Laramie Range of Wyoming. The inferred remnant fracture orientations agree with brittle fracture orientations measured at tens of meters depth in boreholes, demonstrating that bedrock fractures persist through the weathering process into the shallow critical zone. Seismic anisotropy positively correlates with saprolite thickness, suggesting that inherited bedrock fractures may control saprolite thickness by providing preferential pathways for corrosive meteoric waters to access the deep critical zone.

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“…These data have also been interpreted as indicators of horizontal stress orientations (Tsuji et al, 2011b).…”

Section: Accepted 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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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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In situ stress state from walkaround VSP anisotropy in the Kumano basin southeast of the Kii Peninsula, Japan

Cited by 22 publications

References 36 publications

In situ stress and pore pressure in the Kumano Forearc Basin, offshore SW Honshu from downhole measurements during riser drilling

In situ stress and pore pressure in the Kumano Forearc Basin, offshore SW Honshu from downhole measurements during riser drilling

Mapping Inherited Fractures in the Critical Zone Using Seismic Anisotropy From Circular Surveys

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

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