Determination of horizontal stress orientations from borehole breakout analyses in an ocean drilling project

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PreviousNext No AccessProceedings of the 11th SEGJ International Symposium, Yokohama, Japan, 18-21 November 2013Determination of horizontal stress orientations from borehole breakout analyses in an ocean drilling projectAuthors: Weiren LinYukari KidoYoshinori SanadaSaneatsu SaitoNobuhisa EguchiSean ToczkoLena MaedaJames J. MoriFrederick M. ChesterExpedition 343 ScientistsWeiren LinJAMSTEC, Japan, ;Search for more papers by this author, Yukari KidoJAMSTEC, Japan, ;Search for more papers by this author, Yoshinori SanadaJAMSTEC, Japan, ;Search for more papers by this author, Saneatsu SaitoJAMSTEC, Japan, ;Search for more papers by this author, Nobuhisa EguchiJAMSTEC, Japan, ;Search for more papers by this author, Sean ToczkoJAMSTEC, Japan, ;Search for more papers by this author, Lena MaedaJAMSTEC, Japan, ;Search for more papers by this author, James J. MoriKyoto University, Japan;Search for more papers by this author, Frederick M. ChesterTexas A&M Univ., USA;Search for more papers by this author, and Expedition 343 ScientistsSearch for more papers by this authorhttps://doi.org/10.1190/segj112013-085 SectionsAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract Integrated Ocean Drilling Program (IODP) Expedition 343, Japan Trench Fast Drilling Project (JFAST), drilled three boreholes at Site C0019 to investigate the large shallow slip during the 2011 Tohoku-oki earthquake (Mw 9.0). Borehole C0019B dedicated to logging-while-drilling (LWD) penetrated 850 meters below seafloor (mbsf) at a water depth of approximately 6890 m, and penetrated through the plate boundary shear zone between the subducting Pacific Plate and overriding North American Plate. The plate boundary was located at about 820 mbsf and was the likely slip zone during the 2011 Tohoku-oki earthquake. Borehole wall resistivity images obtained from LWD show that the drilling induced borehole breakouts are available in a wide depth range of ~44 – 813 mbsf above the fault but are not available below the fault. Breakouts are reliable as indicators of the orientations of current maximum and minimum horizontal stresses and can be used to constrain stress magnitudes. We have analyzed the breakouts observed from borehole wall images of Hole C0019B. As a result, the maximum horizontal stress orientation highly varied in the upper part of the borehole (~44 – 537 mbsf), but has a clear preferred orientation in a northwest – southeast direction (319 – 139°) in the deeper part (~537 – 813 mbsf). This orientation is approximately parallel to the direction of the Pasific Plate subduction. Keywords: stress orientation, in-situ stress, borehole breakout, ocean drilling, borehole image, logging while drilling (LWD), marine, earthquakePermalink: https://doi.org/10.1190/segj112013-085FiguresReferencesRelatedDetails Proceedings of the 11th SEGJ International Symposium, Yokohama, Japan, 18-21 November 2013ISSN (online):2159-6832Copyright: 2013 Pages: 580 publication data© 2013 Published in electronic format with permission by the Society of Exploration Geophysicists of JapanPublisher:Society of Exploration Geophysicists HistoryPublished: 15 Jan 2014 CITATION INFORMATION Weiren Lin, Yukari Kido, Yoshinori Sanada, Saneatsu Saito, Nobuhisa Eguchi, Sean Toczko, Lena Maeda, James J. Mori, Frederick M. Chester, and Expedition 343 Scientists, (2013), "Determination of horizontal stress orientations from borehole breakout analyses in an ocean drilling project," SEG Global Meeting Abstracts : 335-338. https://doi.org/10.1190/segj112013-085 Plain-Language Summary Keywordsstress orientationin-situ stressborehole breakoutocean drillingborehole imagelogging while drilling (LWD)marineearthquakePDF DownloadLoading ...