The same grade terrace height beside the river is surveyed at almost the same level, proved that the hidden fault under the river never moved after.

• 经测量河流两侧相对应的同级阶地面处在相同的高度上,证明自晚更新世大凌河三级阶地形成以来位于大凌河床底部的隐伏断裂没有过活动。