2019 Volume 25 Pages 663-668
We need the frequency of deep-seated landslides when we plan the countermeasure for them. In recent years, the method by estimating the frequency by carbon dating has been proposed. However, the method to estimate the frequency in very large area such Kii mountain area is not established. In this paper we tried to propose the research flow to estimate the frequency in large area, and showed the frequency of deep-seated landslide in Kii mountain area. The flow was consisted of three section which are preliminary research, detailed research and sample analysis. We listed the point to extract landslide deposit in preliminary research and developed the sampler to collect samples in detailed research. The frequency from carbon dating was approximately 100-200 years which was not conflicting to some historical document.
