Abstract
The occurrence number of landslides due to heavy storms per unit area (250m×250m) is found to follow a negative binomial distribution with the parameters k and p. Taking account of the linear relationship between the mean number of landslides and the parameter k, exponential regression models of k are investigated using the storm charactaristics as the trigger factors of landslides. The regression cofficients of model can be calculated by the maximum likehood method, and the expectations of the occurrence number, area and volume of landslides are estimated.
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