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文章应用应力摩尔圆分析法，探讨了三维空间状态下断层能动度与构造应力方向和断层面几何特征的关系。分析结果表明：断层面法线与最大主压应力方向间的夹角θ在大于断层内摩擦角φ和小于π／２时，断层可能产生滑动；当θ角等于４５°＋φ／２时，断层最易滑动。在此基础上，将断层能动度进行数值化。华北地区１９６６至１９７６年４次强震区的活动断层研究结果，与理论分析结果相符。
In this paper, stress molar circle analysis is applied to investigate the relationship between fault mobility and tectonic stress direction and fault plane geometric features in three-dimensional space. The results show that the fault may slip when the angle θ between the fault normal and the direction of the maximum principal compressive stress is larger than the internal friction angle φ and less than π / 2. When θ is equal to 45 ° + φ / 2, the fault Most easy to slide. Based on this, the fault mobility is quantified. The results of active faults in four strong earthquake regions from 1966 to 1976 in North China are consistent with the theoretical analysis.