Anatomy of first time landslides

2013 Fiscal Year Final Research Report

• Project/Area Number: 23310126
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Natural disaster science
• Research Institution: Kyoto University
• Principal Investigator: CHIGIRA Masahiro 京都大学, 防災研究所, 教授 (00293960)
• Co-Investigator(Kenkyū-buntansha): YAMASAKI Shintaro 北見工業大学, 工学部, 助教 (40584602)
• Co-Investigator(Renkei-kenkyūsha): UETA Keiichi (財)電力中央研究所, 地球工学研究所, 上席研究員 (40371405)
• Project Period (FY): 2011-04-01 – 2014-03-31
• Keywords: 初生地すべり / 山体重力変形 / 地質構造

Research Abstract

We established how to observe and describe high-quality undisturbed drilled cores using methods and knowledge of structural geology, and consequently obtained criteria to differentiate nontectonic faults and tectonic faults. We clarified the relationship between the development of foliation and gravitational rock deformation and the development processes from gravitational slope deformation to first-time landslide.
We simulated the subsurface gravitational slope deformation that have been obtained by high-quality drilled cores by using finite difference methods, demonstrating that the internal stress strain conditions in the slope change according to the river incision forming the shear zones, which have been identified in the nature.

Research Products

• [Journal Article] Development of deep-seated gravitational slope deformation on a shale dip-slope : observations from high-quality drillcores (2013)
  • Author(s): Chigira, M., Hariyama, T., Yamasaki, S.
  • Journal Title: Tectonophysics Volume: 605 Pages: 104-113
  • DOI: 10.1016/j.tecto.2013.04.019
  • Peer Reviewed
• [Journal Article] Topographic precursors and geological structures of deep-seated catastrophic landslides caused by Typhoon Talas (2013)
  • Author(s): Chigira, M., Tsou, C.-Y., Matsushi, Y., Hiraishi, N., Matsuzawa, M.
  • Journal Title: Geomorphology Volume: 201 Pages: 479-493
  • DOI: 10.1016/j.geomorph.2013.07.020
  • Peer Reviewed
• [Journal Article] Landslide Amplification by Liquefaction of Runout-Path Material after the 2008 Wenchuan (M 8_0) Earthquake, China (2013)
  • Author(s): Wang, G., Huang, R., Chigira, M., Wu, X., Lourenco, S.D.N.
  • Journal Title: Earth Surface Processes and Landforms Volume: 38(3) Pages: 265-274
  • DOI: 10.1002/esp.3277
  • Peer Reviewed
• [Journal Article] 近年の斜面災害が与えた教訓 (2013)
  • Author(s): 千木良雅弘
  • Journal Title: 地盤工学会誌 Volume: 61(9) Pages: 1-5
• [Journal Article] 地質災害 (2013)
  • Author(s): 千木良雅弘
  • Journal Title: 地質と調査 Volume: 137 Pages: 32-38
• [Journal Article] Seismic recordings of landslides caused by Typhoon Talas (2011), Japan (2012)
  • Author(s): Yamada, M., Matsushi, Y., Chigira, M., Mori, J.
  • Journal Title: Geophysical Research Letters Volume: 39(doi:13310.11029/12012GL052174.) Pages: L13301
  • Peer Reviewed
• [Journal Article] 2012 年台風12 号による深層崩壊 (2012)
  • Author(s): 千木良雅弘, 松四雄騎, ツォウ・チンイン, 平石成美, 松沢真, 松浦純男
  • Journal Title: 京都大学防災研究所年報 Volume: 55 Pages: 193 - 211
  • URL: http://www.dpri.kyoto-u.ac.jp/nenpo/no55/ronbunA/a55a0p08.pdf
• [Journal Article] Catastrophic landslide induced by Typhoon Morakot, Shiaolin, Taiwan (2011)
  • Author(s): Tsou, C.Y., Feng, Z.Y., Chigira, M
  • Journal Title: Geomorphology Volume: 127(3-4) Pages: 166-178
  • DOI: 10.1016/j.geomorph.2010.12.013
  • Peer Reviewed
• [Journal Article] Weathering mechanisms and their effects on landsliding in pelitic schist (2011)
  • Author(s): Yamasaki, S., Chigira, M
  • Journal Title: Earth Surface Processes and Landforms Volume: 36(4) Pages: 481-494
  • DOI: 10.1002/esp.2067
  • Peer Reviewed
• [Presentation] Precursory landforms and geologic structures of catastrophic landslides induced by typhoon Talas 2011 Japan (2013)
  • Author(s): Chigira, M., Matsushi, Y., Tsou, C.-Y.
  • Organizer: American Geophysical Union. American Geophysical Union
  • Place of Presentation: American Geophysical Union, San Francisco
  • Year and Date: 2013-12-04
  • Invited
• [Presentation] Landslides in tectonically active countries (2013)
  • Author(s): Chigira, M., Kamai, T.
  • Organizer: 2nd G-EVER International Symposium and the 1st IUGS&SCJ International Workshop on Natural Hazards
  • Place of Presentation: Sendai
  • Year and Date: 2013-10-19
• [Presentation] Recent landslide hazards induced by earthquakes and rainfalls in Asia (2013)
  • Author(s): Chigira, M.
  • Organizer: International Symposium & 9th Asian Regional Conference of IAEG (International Association of Engineering Geology and Environment)
  • Place of Presentation: Beijing
  • Year and Date: 2013-09-24
  • Invited
• [Presentation] Geological precursors of catastrophic landslides induced by earthquakes (2013)
  • Author(s): Chigira, M.
  • Organizer: Japan Geoscience Union Meeting 2013
  • Place of Presentation: Makuhari
  • Year and Date: 2013-05-23
• [Presentation] 泥質片岩における萌芽的滑り層の形成条件 (2013)
  • Author(s): 山崎新太郎, 千木良雅弘, Dave Petley
  • Organizer: 日本地球惑星科学連合大会
  • Place of Presentation: 幕張
  • Year and Date: 2013-05-22
• [Presentation] Geological and geomorphological characteristics of catastrophic landslides induced by recent earthquakes (2013)
  • Author(s): Chigira, M.
  • Organizer: The International Symposium in Commemoration of the 5th Anniversary of the 2008 Wenchuan Earthquake.
  • Place of Presentation: Chengdu
  • Year and Date: 2013-05-13
  • Invited
• [Presentation] Topographic precursors and geological structures of deep-seated catastrophic landslides caused by typhoon Talas (2013)
  • Author(s): Chigira, M., Tsou, C.-Y., Matsushi, Y.
  • Organizer: determined from the analysis of high-resolution DEMs
  • Place of Presentation: European Geosciences Union, Vienna
  • Year and Date: 2013-04-10
• [Presentation] Extracting small scarps to predict potential sites of deep-seated landslides (2012)
  • Author(s): Chigira, M., Tsou, C.-Y., Yokoyama, R., Shirasawa, M., Funakoshi, K., Sakurai, Y.
  • Organizer: Japan Geoscience Union Meeting 2013
  • Place of Presentation: Makuhari
  • Year and Date: 2012-05-23
• [Presentation] Deep-seated catastrophic landslides induced by typhoon 12 and their precursory gravitational slope deformation (2012)
  • Author(s): Chigira, M., Tsou Ching-Ying, Matsushi, Y., Hiraishi, N., Matsuzawa, M.
  • Organizer: Japan Geosciences Union Meeting 2012
  • Place of Presentation: Makuhari
  • Year and Date: 2012-05-23
• [Presentation] Rainfall, slope instability, and deep-seated landslides in Kii Mountains Japan (2012)
  • Author(s): Matsushi, Y., Yamada, M., Chigira, M.
  • Organizer: Japan Geosciences Union Meeting 2012
  • Place of Presentation: Makuhari
  • Year and Date: 2012-05-23
• [Presentation] Seismic recordings of the Landslides caused by Typhoon Talas (2012)
  • Author(s): Yamada, M., Matsushi, Y., Chigira, M.
  • Organizer: Japan Geosciences Union Meeting 2012
  • Place of Presentation: Makuhari
  • Year and Date: 2012-05-23
• [Presentation] A method for making wide cross-sections of fracture zone formed by deep-seated gravitational slope deformations (2011)
  • Author(s): Yamasaki, S., Chigira, M.
  • Organizer: 2nd Conference on Slope Tectonics
  • Place of Presentation: Vienna
  • Year and Date: 2011-09-06
• [Presentation] 頁岩の流れ盤斜面における重力変形 (2011)
  • Author(s): 千木良雅弘, 針山岳大
  • Organizer: 日本地すべり学会研究発表会
  • Place of Presentation: 静岡
  • Year and Date: 2011-08-31
• [Book] 深層崩壊-どこが崩れるのか- (2013)
  • Author(s): 千木良雅弘
  • Publisher: 近未来社
• [Book] Landslides induced by the Wenchuan earthquake (2012)
  • Author(s): Chigira, M., Wang, G., Wu, S.
  • Total Pages: 383-392
  • Publisher: Cambridge University Press
• [Book] 地震地すべりと地質, 地震地すべり (2012)
  • Author(s): 千木良雅弘
  • Total Pages: 103-109
  • Publisher: 社団法人日本地すべり学会 (編)
• [Book] 災害地質学(斜面災害) (2011)
  • Author(s): 千木良雅弘
  • Total Pages: 73-100
  • Publisher: 古今書院
• [Book] 深層崩壊発生の地形・地質的な場 (2011)
  • Author(s): 千木良雅弘
  • Total Pages: 114-116
  • Publisher: 丸善出版
• [Remarks]
  • URL: http://www.slope.dpri.kyoto-u.ac.jp/index.html