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在陡坡、山脊等凸状地段，因地震易发生坡面崩塌。利用航片、地形图研究崩塌分布，对崩塌坡面的特征与整个坡面的关系难以定量测定，为此研究数字地图判定坡面崩塌的模型。将发生在地震区内的航片，先作成数字地图（网格为5m），利用计算机计算数字地图上各节点的坡度θ和平均曲率H。利用坡度θ和平均曲率H的相互组合，可以比较判明崩塌坡面的特征，根据与判别直线θ＝966H＋44的距离的程度可判断崩塌发生的难易程度。
In steep slopes, ridges and other convex areas, prone to slope collapse due to earthquakes. Using aerial photographs and topographic maps to study the distribution of the collapse, it is difficult to quantitatively determine the relationship between the characteristics of the collapsed slope and the entire slope. Therefore, the digital map to determine the slope collapse model is studied. The aerial photos that will take place in the earthquake area are first made into a digital map (grid 5m), and the slope θ and average curvature H of each node on the digital map are calculated by a computer. By using the combination of the slope θ and the mean curvature H, the characteristics of the collapsed slope can be identified and compared, and the difficulty of the collapse can be judged according to the distance from the straight line θ = 966H + 44.