Abstract
As the fixed elements of occurrence of the avalanche, the authors defined vegetation, degrees of inclination, direction and type of the slopes which are able to measure or interprete mith non-snow covered aerial photos.
Using these elements, every slope which is devided by ridge and drainage classified 84 patterns.
With snow covered aerial photos interpreted avalanches, and then calculated the statistical probability of occurrence of the avalanche for every pattern.
If such fixed elements are able to measure or interprete, the probability of the occurrence of the avalanche would be estimated at everywhere by means of this result.
