Abstract: Using a fractal geometry analysis,the fault systems in northwestern Yunnan were interpreted and their geometrical standings were determined. The fractal characteristics of active fault systems are described by a comparison of the fault and river systems in several subareas. The result shows that 1) NE-trending fault system (D=1.32) is more complicated in geometry than those in NW(D=1.26) or SN (D=1.32) directions,indicating that NE-and NW-trending fault systems are at least equal in status in this region,and 2) the difference -in fractal dimension between active fault and river system increases from south to north,indicating that the distribution of river system is more strongly controlled by strike-slip fault than oblique-slip fault.

Key words: Fractal dimensionm, Active fault pattern, River system, Northwestern Yunnan Province

摘要： 本文应用分数维几何学的方法,对滇西北区断裂系进行解析并确立了各断裂系的地位;从该区各典型子区活动断裂与水系的几何学分析和对比,探讨了二者的分布特征及其相关性。

关键词: 分数维, 活动断裂格局, 水系, 滇西北