Plumose fracture and orientation of dislocation was applied to find out whether sharp angle zone or obtuse angle zone between two groups of conjugate joints was compressive zone.

• 采用共轭剪节理和断层面产状、擦痕侧伏角及移位符号综合确定主应力轴，并指出两组共轭剪节理所夹钝角压也可能为压缩区，其判别方法采用羽裂判断法和位错方向判断法。