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

• Material Type: 記事
• Title: Small-scale stress fluctuations in borehole breakouts and their implication in identifying potential active faults around the seismogenic megasplay fault, Nankai Trough, SW Japan
• Author/Editor: Yasuhiro Yamada; Jun Shibanuma
• Publication, Distribution, etc.: 日本 : Springer science+business media
• Publication Date: 2015-02-06
• Publication Date (W3CDTF): 2015-02-06
• Periodical title: EPS : Earth, Planets and Space
• No. or year of volume/issue: 67(17)
• Volume: 67(17)
• ISSN (Periodical Title): 1880-5981
• ISSN-L (Periodical Title): 1343-8832
• Text Language Code: eng
• DOI: 10.1186/s40623-014-0176-9; https://doi.org/10.1186/s40623-014-0176-9
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• Date Accepted (W3CDTF): 2015-04-17T10:30:12+09:00
• Date Captured (W3CDTF): 2015-02-24
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• Bibliographic Record Category (NDL): 632

• Summary, etc.: Borehole breakouts are enlargements and elongation of a borehole in a particular direction, caused by failure of the borehole wall rock due to concentration of stresses around the borehole, and thus, have been widely used to determine the in situ stress orientation. We used electrical borehole wall images obtained during offshore scientific drilling (IODP) that penetrated through a seismogenic megasplay fault in the Nankai Trough, off SW Japan, and extracted a number of borehole breakouts. Most of the breakouts show directions that can be explained by the regional convergence, but some are obviously rotated by faults and fractures in the megasplay fault zone and in its hanging wall. Stress magnitudes estimated from the width of the breakouts also show some decrease in the horizontal stresses, suggesting that slip along the faults and fractures release shear stress affecting these surfaces. Since such surfaces may have the capability to reactivate where the stresses affecting the surface are geometrically appropriate, the method presented in this paper may contribute to identifying active fault surfaces. This knowledge allows us to identify which surfaces need to be examined in detail to assess their potential for future activity.
• DOI: 10.1186/s40623-014-0176-9; https://doi.org/10.1186/s40623-014-0176-9
• Access Restrictions: インターネット公開
• Rights (production): © 2015 Yamada and Shibanuma; licensee Springer. © 2015 Yamada and Shibanuma; licensee Springer. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.
• Related Material (URI): http://hdl.handle.net/2433/212426; http://id.ndl.go.jp/digimeta/9227937; https://dl.ndl.go.jp/pid/9227937; http://link.springer.com/content/pdf/10.1186/s40623-014-0176-9.pdf; http://link.springer.com/article/10.1186/s40623-014-0176-9/fulltext.html; http://link.springer.com/content/pdf/10.1186/s40623-014-0176-9
• Is Referenced By: Stress State in the Kumano Basin and in Slope Sediment Determined From Anelastic Strain Recovery: Results From IODP Expedition 338 to the Nankai Trough; https://cir.nii.ac.jp/crid/1050567175258280192; Distribution of stress state in the Nankai subduction zone, southwest Japan and a comparison with Japan Trench; https://cir.nii.ac.jp/crid/1050845760779256704; Stress changes in an accretionary wedge related to the displacement of an out‐of‐sequence thrust in a numerical simulation; https://cir.nii.ac.jp/crid/1360004235528031360; Multiple Types of Porosity – P‐Wave Velocity Relationships for the Nankai Trough; https://cir.nii.ac.jp/crid/1360298757432546176; 科学掘削による地震断層の応力状態・物性・すべりパラメーターの評価; https://cir.nii.ac.jp/crid/1390282679214266752; 南海トラフ地震発生帯掘削がもたらした沈み込み帯の新しい描像; https://cir.nii.ac.jp/crid/1390845712966874112
• References: Vp/Vs ratio and shear-wave splitting in the Nankai Trough seismogenic zone: insight into effective stress, pore pressure, and sediment consolidation; https://cir.nii.ac.jp/crid/1050001202178685312; Characteristics of a tsunamigenic megasplay fault in the Nankai Trough; https://cir.nii.ac.jp/crid/1050001335780632192; Granular experiments of thrust wedges: Insights relevant to methane hydrate exploration at the Nankai accretionary prism; https://cir.nii.ac.jp/crid/1050282810757340928; Structural styles across the Nankai accretionary prism revealed from LWD borehole images and their correlation with seismic profile and core data: Results from NanTroSEIZE Stage 1 expeditions; https://cir.nii.ac.jp/crid/1050845760675297152; Localized rotation of principal stress around faults and fractures determined from borehole breakouts in hole B of the Taiwan Chelungpu-fault Drilling Project (TCDP); https://cir.nii.ac.jp/crid/1360002216175278336; Three-Dimensional Splay Fault Geometry and Implications for Tsunami Generation; https://cir.nii.ac.jp/crid/1360011142936447872; Crustal velocity field of southwest Japan: Subduction and arc‐arc collision; https://cir.nii.ac.jp/crid/1360292617909503360; Elevated fluid pressure and extreme mechanical weakness of a plate boundary thrust, Nankai Trough subduction zone; https://cir.nii.ac.jp/crid/1360292617918032384; Impact of a modified convective scheme on the Madden‐Julian Oscillation and El Niño–Southern Oscillation in a coupled climate model; https://cir.nii.ac.jp/crid/1360292619832414464; A program to model the initial shape and extent of borehole breakout; https://cir.nii.ac.jp/crid/1360292620213326336; In situ stress state in the Nankai accretionary wedge estimated from borehole wall failures; https://cir.nii.ac.jp/crid/1360565166661581056; Spatial and temporal evolution of the megasplay fault in the Nankai Trough; https://cir.nii.ac.jp/crid/1360574096581186304; A model for the motion of the Philippine Sea Plate consistent with NUVEL‐1 and geological data; https://cir.nii.ac.jp/crid/1360855567866336512; Selective fault reactivation during basin inversion: potential for fluid redistribution through fault-valve action; https://cir.nii.ac.jp/crid/1361137046483170432; Local Rotations in Borehole Breakouts—Observed and Modeled Stress Field Rotations and Their Implications for the Petroleum Industry; https://cir.nii.ac.jp/crid/1361418520974926592; Effective stress and pore pressure in the Nankai accretionary prism off the Muroto Peninsula, southwestern Japan; https://cir.nii.ac.jp/crid/1361981469136454400; A statistical evaluation of intact rock failure criteria constrained by polyaxial test data for five different rocks; https://cir.nii.ac.jp/crid/1361981469169990016; Effects of rock anisotropy and heterogeneity on stress distributions at selected sites in North America; https://cir.nii.ac.jp/crid/1362262944546610816; Stress orientation profile to 3.5 km depth near the San Andreas Fault at Cajon Pass, California; https://cir.nii.ac.jp/crid/1362262944968608512; Empirical relations between rock strength and physical properties in sedimentary rocks; https://cir.nii.ac.jp/crid/1362544420534332032; Stress perturbations associated with active faults penetrated by boreholes: Possible evidence for near‐complete stress drop and a new technique for stress magnitude measurement; https://cir.nii.ac.jp/crid/1362825893664083968; Modern and ancient seismogenic out‐of‐sequence thrusts in the Nankai accretionary prism: Comparison of laboratory‐derived physical properties and seismic reflection data; https://cir.nii.ac.jp/crid/1363107370296589568; Variation of physical properties beneath a fault observed by a two‐ship seismic survey off southwest Japan; https://cir.nii.ac.jp/crid/1363670320275445888; Origin and evolution of a splay fault in the Nankai accretionary wedge; https://cir.nii.ac.jp/crid/1571417126454293760; Seismic reflection and bathymetric evidences for the Nankai earthquake rupture across a stable segment-boundary; https://cir.nii.ac.jp/crid/2051151842091770240; Strike-slip motion of a mega-splay fault system in the Nankai oblique subduction zone; https://cir.nii.ac.jp/crid/2051996267023651328; Heat flow survey in the vicinity of the branches of the megasplay fault in the Nankai accretionary prism; https://cir.nii.ac.jp/crid/2051996267023652736
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• Bibliographic ID (NDL): 9227937; http://id.ndl.go.jp/bib/9227937
• NAID: 120005756319