Slope unit based 3D landslide hazard mapping system

T. Esaki, M. Xie, G. Zhou, Y. Mitani

Research output: Contribution to conferencePaperpeer-review


The assessment of landslide instability and risk has become a topic of major interest for both geoscientists and engineering professionals as well as for local communities and administrations in many parts of the world. In this paper, based on a new developed Geographic Information Systems (GIS) grid-based 3D deterministic model and taken the slope unit as the study object, the landslide hazard is mapped by the index of the 3D safety factor. Assuming the initial slip as the lower part of an ellipsoid, the 3D critical slip surface in the 3D slope stability analysis is obtained by means of a minimization of the 3D safety factor using the Monte Carlo random simulation. The failure probability of the landslide is calculated by an approximate method in which the distributions of c,f and the 3D safety factor are assumed to be in normal distributions. The assessment of the earthquake triggered landslide hazard is done by the dynamic displacement analysis using the index of the Newmark displacement. All the calculations are implemented by a computational system call 3DSLOPEGIS in that a GIS component is used for fulfilling the GIS spatial analysis function. Besides the results of 3D safety factor and probability, the possible landslide body and boundary can be three-dimensionally quantitatively identified.

Original languageEnglish
Number of pages4
Publication statusPublished - 2003
Event10th International Society for Rock Mechanics Congress, ISRM 2003 - Sandton, South Africa
Duration: Sept 8 2003Sept 12 2003


Other10th International Society for Rock Mechanics Congress, ISRM 2003
Country/TerritorySouth Africa

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Geophysics


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