Small-scale stress fluctuations in borehole breakouts and their implication in identifying potential active faults around the seismogenic megasplay fault, Nankai Trough, SW Japan

Yamada, Yasuhiro; Shibanuma, Jun

doi:10.1186/s40623-014-0176-9

Cited by 13 publications

(10 citation statements)

References 28 publications

(45 reference statements)

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“…More recent analyses of borehole breakouts, however, by Olcott and Saffer (2012) and Yamada and Shibanuma (2015) suggest that SHmax at this site possibly represents 1 consistent with a reverse or strike-slip faulting regime. They described that the magnitude of the vertical stress Sv may be smaller than that of SHmax but within the possible range of Shmin (see Fig.…”

Section: Accepted M Manuscriptmentioning

confidence: 73%

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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: 73%

“…They described that the magnitude of the vertical stress Sv may be smaller than that of SHmax but within the possible range of Shmin (see Fig. 4 in Yamada and Shibanuma, 2015).…”

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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“…Although previous work has focused on the in situ stress magnitudes (e.g., Chang et al 2010;Lin et al 2013;Yamada and Shibanuma 2015), the use of two holes allows us, for the first time, to concurrently constrain formation strength in situ. To accomplish this, we develop a forward model to predict breakout width in each borehole using direct measurements of APRS from measurement while drilling (MWD) tools and of S hmin from leak-off tests.…”

Section: Introductionmentioning

confidence: 99%

In situ stress magnitude and rock strength in the Nankai accretionary complex: a novel approach using paired constraints from downhole data in two wells

2016

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We present a method to simultaneously constrain both far-field horizontal stress magnitudes (S hmin and S Hmax ) and in situ rock unconfined compressive strength (UCS), using geophysical logging data from two boreholes located 70 m apart that access the uppermost accretionary prism of the Nankai subduction zone . The boreholes sample the same sediments and are affected by the same tectonic stress field, but were drilled with different annular pressures, thus providing a unique opportunity to refine estimates of both in situ stress magnitudes and rock strength. We develop a forward model to predict the angular width of compressional wellbore failures (borehole breakouts), and identify combinations of S Hmax and UCS that best match breakout widths observed in resistivity images from the two boreholes. The method requires knowledge of S hmin , which is defined by leak-off tests conducted during drilling. Our results define a normal to strike-slip stress regime from 900 to 1386 m below seafloor, consistent with observations from seismic and core data. Our analysis also suggests that in situ values of UCS are generally slightly lower that commonly assumed on the basis of published empirical relations between UCS and P-wave velocity.

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“…Maximum, Intermediate, and Minimum strains, and Mean principal strain) are calculated from anelastic strain raw data in nine directions, (d) Stereo projections (lower hemisphere) of orientations of three-dimensional principal stresses, which are the same as those of the principal anelastic strains from ASR measurements with respect to the true north coordinate system (Byrne et al, 2009) . et al, 2009;Lin et al, 2010;Chang et al, 2010;Song et al, 2011;Moore et al, 2011;Tsuji et al, 2011;Wu et al, 2012Wu et al, , 2013Wu et al, , 2015Lewis et al, 2013;Lee et al, 2013;Yamamoto et al, 2013;Kinoshita and Tobin, 2013;Ito et al, 2013;Saffer et al, 2013;Conin et al, 2014;Yamada and Shibanuma, 2015) Tanikawa et al, 2013) .…”

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Evaluating Stress State, Physical Properties, and Rupturing Behavior of Seismogenic Faults through Scientific Drillings

為人¹,

丈洋²,

亘³

et al. 2017

Journal of Geography(Chigaku Zasshi)

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To better understand seismic fault rupturing mechanisms, recent research results from scientific ocean drilling projects in seismogenic subduction zones such as Japan Trench and Nankai Trough carried out under the International Ocean Discovery Program (IODP) are reviewed and summarized. Stress states in the vicinity of faults and in wall rocks penetrated by drillings are determined or constrained using borehole wall resistivity images and drill core samples. The stress measurement methods are summarized and the stress results are interpreted. Fluid transportation properties and thermal properties within and around the faults are determined from retrieved core samples. The results are both useful and necessary for examining fault rupturing lubrication mechanisms, e.g., coseismic thermal pressurization. Dynamic frictional behavior of fault gouges is elucidated through rotary frictional experiments over a wide range from intermediate to high velocities covering the real coseismic fault slip velocity at around 1 m/s; the results indicate that frictional coefficients of plate boundary fault gouges in subduction zones are very low. In addition, high-temperature history examined with vitrinite reflectance measurements and minor element movements from isotopic analyses using the fault core samples give important evidence of the frictional heat of faults. Such historic high-temperature signals also enable inversion estimations to reveal past fault-rupturing parameters. It is hoped this review paper will be valuable and helpful for planning and implementing future scientific fault drilling programs.

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Small-scale stress fluctuations in borehole breakouts and their implication in identifying potential active faults around the seismogenic megasplay fault, Nankai Trough, SW Japan

Cited by 13 publications

References 28 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

In situ stress magnitude and rock strength in the Nankai accretionary complex: a novel approach using paired constraints from downhole data in two wells

Evaluating Stress State, Physical Properties, and Rupturing Behavior of Seismogenic Faults through Scientific Drillings

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