The first belt stretches from Qinghe, Wenquan to the NW direction and the second extends from Nankou, Changping to the ENE direction.

• 一条从清河、温泉一带向北西方向伸展，到怀来县以北的黄土窑一带；另一条是自南口、昌平一带向北东东向伸展的活动断裂带。