Abstract
volcanic rocks is responsible for the high calcium and sulfate concentration. The δ 34 S values of dissolved sulfate in the surface waters support this view. Intense rock weathering at the head areas of sulfate-rich streams is likely to have caused the 1964 large-scale landslide there. Positive correlation between SO4 2‐ concentration in the streams and a ratio of landslide area to the catchment area indicates a high probability of landslide in the area where SO4 2‐ concentration in water is high. Hydrogeochemical information at landslide areas has a potential of identifying the area of future landslide.
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