Abstract
Risk evaluation for earthquake-induced rapid and long-travel landslides in densely populated urban areas is currently the most important disaster mitigation task in landslide-threatened areas throughout the world. The research achievements of the IPL M-101 APERITIF project were applied to two urban areas in megacities of Japan. One site is in the upper slope of the Nikawa landslide site where previous movements were triggered by the 1995 Hyogoken-Nambu earthquake. During detailed investigation, the slope was found to be at risk from a rapid and long-travel landslide induced by sliding surface liquefaction by earthquakes similar in scale to the 1995 event. A new plan to prevent the occurrence of this phenomenon was proposed and the plan was implemented. Another area is the Tama residential area near Tokyo. A set of field and laboratory investigations including laser scanner, geological drilling and ring-shear tests showed that there was a risk of sliding surface liquefaction for both sites. A geotechnical computer simulation (Rapid/LS) using the quantitative data obtained in the study allowed urban landslide hazard zoning to be made at individual street level.
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Acknowledgments
This research was conducted as a part of the areal prediction of earthquake and rain induced rapid and long-traveling flow phenomena (APERITIF) project of the International Programme on Landslides (IPL M101), which was funded by the Special Coordinating Fund for Promoting Science and Technology of the Ministry of Education, Culture, Sports, Science and Technology (MEXT) in 2001–2004.
This subproject of APERITIF project was supported by all group members of this project including members of Tokyo university (Ikuo Towhata, Kazuo Konagai), the Geographical Survey Institute of Japan (Seiji Ichikawa, Minoru Hoshino, Ryoichi Kojiroi, Hiroshi Sato), the Japan Landslide Society (Takahiko Furuya, Chigira Masahiro), National Research Institute of Earth Science and Disaster Prevention (Hiromu Moriwaki, Yasuhiko Okada), Niigata University (Hideaki Marui), and this research benefited from the advice of Prof. Osamu Sato, Prof. Akira, Iwamatsu and Dr. Norio Oyagi of the project management committee.
The authors deeply appreciate the cooperation of the office of Disaster Prevention Research of MEXT for its cooperation with the implementation of this project.
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Sassa, K., Wang, G., Fukuoka, H. et al. Landslide risk evaluation and hazard zoning for rapid and long-travel landslides in urban development areas. Landslides 1, 221–235 (2004). https://doi.org/10.1007/s10346-004-0028-y
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DOI: https://doi.org/10.1007/s10346-004-0028-y