Environmental Earth Sciences

, Volume 62, Issue 1, pp 25–31 | Cite as

Kita-Uebaru natural rock slope failure and its back analysis

  • Naohiko Tokashiki
  • Ömer AydanEmail author
Original Article


A large landslide occurred in Kita-Uebaru (or Asato) area of Nakagusuku village in Okinawa Island (Japan) on 10 June 2006 after a rainy period of about 9 days. The total rainfall was 126 mm from June 8 till the time of the landslide this period. This landslide destroyed several buildings and roads, and the total travel distance of the landslide was about 110 m. In this article, the authors were concerned with the initiation conditions of Kita-Uebaru landslide and post-failure motions of the landslide body. The observations made in the landslide area, structural geology analyses and outcomes of geotechnical investigations are described first. Then, possible causes of the landslide are investigated through back analyses using as inputs the geological structure and the strength properties of planes of discontinuities involved in the sliding processes. The final part of the article is concerned with the simulation of post-failure motions of the landslide body. The results of the investigations and back analyses indicate that the failure plane was bi-planar and the heavy torrential rainy period for about 3 days was the main cause of initiation of the landslide. The mechanical model presented in this article was capable of capturing the overall features of the landslide body following the initiation of the failure.


Landslide Rainfall Post-failure motion Limiting equilibrium analysis 



The authors would like to sincerely acknowledge the Civil and Architectural Engineering Division of Okinawa Prefectural Government for the information on the Kita-Uebaru landslide and aerial photographs and topographic map of the landslide body.


  1. Aydan Ö (2003) Actual observations and numerical simulations of surface fault ruptures and their effects engineering structures. In: The eight U.S.-Japan workshop on earthquake resistant design of lifeline facilities and countermeasures against liquefaction. Technical report, MCEER-03-0003, pp 227–237Google Scholar
  2. Aydan Ö (2009) Characteristics of large rock slope failures induced by recent worldwide earthquakes. Earthquake Geotechnical Engineering Satellite Conference XVIIth International Conference on Soil Mechanics & Geotechnical Engineering, Alexandria, Egypt (on CD)Google Scholar
  3. Aydan Ö, Shimizu Y (1993) Post-failure motions of rock slopes. Proceedings of Int Symp. Assessment and Prevention of Failure Pheomena in Rock Engineering, Istanbul, pp 409–415Google Scholar
  4. Aydan Ö, Ulusay R (2002) A back analysis of the failure of a highway embankment at Bakacak during the 1999 Düzce-Bolu earthquake. Env Geol 42:621–631CrossRefGoogle Scholar
  5. Aydan Ö, Shimizu Y, Kawamoto T (1992) The reach of slope failures. Proceedings of the 6th Int Symp. Landslides, ISL 92, 1, Christchurch, pp 301–306Google Scholar
  6. Aydan Ö, Üçpırtı H, Kumsar H (1996) Stability of slopes having an inclined sliding surface with a visco-plastic behaviour. Proceedings of Korea-Japan Joint Symposium on Rock Eng., pp 437–444Google Scholar
  7. Aydan Ö, Kumsar H, Ulusay R, Shimizu Y (1997) Assessing limiting equilibrium methods (LEM) for slope stability by discrete finite element method (DFEM). Proceedings of IACMAG, Wuhan, pp 1681–1686Google Scholar
  8. Aydan Ö, Atak VO, Ulusay R, Hamada H, Bardet JP (2005) Ground deformations and lateral spreading around the shore of Sapanca Lake induced by the 1999 Kocaeli earthquake. In: Proceedings of geotechnical earthquake engineering satellite conference, performance based design in earthquake geotechnical engineering: concepts and research, Osaka, pp 54–61Google Scholar
  9. Aydan Ö, Ohta Y, Tokashiki N, Akagi T (2006) Prediction of post-failure motions of rock slopes induced by earthquakes. Proceedings 35th Rock Mechanics Symposium of Japan, pp 103–108Google Scholar
  10. Aydan Ö, Ulusay R, Atak VO (2008) Evaluation of ground deformations induced by the 1999 Kocaeli earthquake (Turkey) at selected sites on shorelines. Environ Geol 54:165–182CrossRefGoogle Scholar
  11. Aydan Ö, Ohta Y, Hamada M (2009a) Geotechnical evaluation of slope and ground failures during the 8 October 2005 Muzaffarabad earthquake in Pakistan. J Seismol 13(3):399–413CrossRefGoogle Scholar
  12. Aydan Ö, Hamada M, Itoh J, Ohkubo K (2009b) Damage to civil engineering structures with an emphasis on rock slope failures and tunnel damage induced by the 2008 Wenchuan earthquake. J Disaster Res 4(2):153–164Google Scholar
  13. Gibo S, Zhou Y, Sasaki K, Nakamura S (2006) Kita-Uebaru landslide caused by continual rainfall in Nakagusuku Village, Okinawa Prefecture on June 10, 2006. J Jpn Landslide Soc 43(2):44–47Google Scholar
  14. Japan Geographical Surveying Institute (2006) On the landslide of Okinawa PrefectureGoogle Scholar
  15. Japan Geological Survey (2006) On the geological aspects of the landslide of Okinawa PrefectureGoogle Scholar
  16. Japan Meteorological Agency (2006) The Kita-Uebaru landslide of Okinawa PrefectureGoogle Scholar
  17. Nakamura S, Gibo S, Iwasaki S (2006) The estimation of average strength of sliding surface using Shimajiri, mudstone formation strength graph. Proceedings of Annual Meeting Papers of Okinawa Geotechnical Society, pp 49–52Google Scholar
  18. Okinawa Prefectural Government (2006) Governmental Response to Nakagusuku Kita-Uebaru landslideGoogle Scholar
  19. Tokashiki N, Aydan Ö (2003) Characteristics of Ryukyu Limestone and its utilization as a building stone in historical and modern structures. In: International symposium on industrial minerals and building stones, Istanbul, pp 311–318Google Scholar
  20. Ulusay R, Aydan Ö, Kılıç R (2007) Geotechnical assessment of the 2005 Kuzulu landslide (Turkey). Eng Geol 89(1–2):112–128CrossRefGoogle Scholar
  21. Voight B (1988) Materials science laws applies to time forecast of slope failure, In: C. Bonnard (ed) Proceedings of 5th Int Symp Landslides Lausanne 1988, Vol 3, pp 1471–1472Google Scholar

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Department of Civil EngineeringRyukyu UniversityNahaJapan
  2. 2.Department of Marine Civil EngineeringTokai UniversityShizuokaJapan

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