Landslides

, Volume 13, Issue 6, pp 1405–1419 | Cite as

A new landslide-induced tsunami simulation model and its application to the 1792 Unzen-Mayuyama landslide-and-tsunami disaster

  • Kyoji Sassa
  • Khang Dang
  • Hideaki Yanagisawa
  • Bin He
Original Paper

Abstract

By combining landslide dynamics research and tsunami research, we present an integrated series of numerical models quantitatively simulating the complete evolution of a landslide-induced tsunami. The integrated model simulating the landslide initiation and motion uses measured landslide dynamic parameters from a high-stress undrained dynamic-loading ring shear apparatus. It provides the numerical data of a landslide mass entering and moving under water to the tsunami simulation model as the trigger of tsunami. The series of landslide and tsunami simulation models were applied to the 1792 Unzen-Mayuyama megaslide and the ensuing tsunami disaster, which is the largest landslide disaster, the largest volcanic disaster, and the largest landslide-induced tsunami disaster to have occurred in Japan. Both the 1792 megaslide and the tsunami portions of the disaster are well documented, making this an excellent test of the reliability and precision of the new simulation model. The simulated tsunami heights at the coasts well match the historical tsunami heights recorded by “Tsunami-Dome-Ishi” (a stone showing the tsunami reaching point) and memorial stone pillars.

Keywords

Unzen-Mayuyama landslide Landslide-induced tsunami Undrained ring shear test Computer simulation 

Notes

Acknowledgments

The authors appreciate the cooperation from the Unzen Restoration Office of the Ministry of Land Infrastructure and Transport (MLIT) of Japan and the Unzen Volcanic Area Global Geopark Office, the Unzen Museum, and Prof. Kaoru Takara (Disaster Prevention Research Institute, Kyoto University, Japan) and Dr. Kimio Inoue (Sabo Frontier Foundation, Tokyo, Japan) for their investigation of the Unzen Mayuyama megaslide. We acknowledge Mr. Yuji Sato and the GODAI Development Cooperation, Kanazawa, Japan, for their cooperation in the development of the user-friendly software LS-Tsunami and LS-Motion.

Note: This simulation was conducted by a laptop computer (CPU @1.80 GHz, 2.39 GHz, RAM 8.00 GB) and a desk top computer (CPU 3.50 GHz, 4.00 GHz, RAM 64.0 GB).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Kyoji Sassa
    • 1
  • Khang Dang
    • 1
    • 2
  • Hideaki Yanagisawa
    • 3
  • Bin He
    • 4
  1. 1.International Consortium on LandslidesSakyo-kuJapan
  2. 2.VNU University of Science, Vietnam National UniversityThanh XuanVietnam
  3. 3.Department of Regional Design, Faculty of Liberal ArtsTohoku Gakuin UniversitySendaiJapan
  4. 4.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and LimnologyChinese Academy of ScienceNanjingPeople’s Republic of China

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