Abstract: The Dalinghe hidden fault, as an example in this paper, is just located under the Dalinghe river, so the activity of this hidden fault can be defined by comparing Quaternary layers and terraces beside the river (hidden fault). Based on spore analysis of 17 layers and several ¹⁴C chronological data, the T₁ terrace of Dalinghe river section from Dayushupu to Linghai city is formed between Q₃ and Q₄; T₂ formed in Q₃; T₃ formed between Q₂ and Q₃¹. 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 Q₃ when T₃ formed. The average crust up rate in this area from Q₃ till now is 0.20-0.28mm/a.

Key words: Dalinghe river, hidden fault, Quaternary, terrace

摘要： 以大凌河隐伏断裂为实例，根据断裂位于大凌河床底部的特点，通过对比河流(断裂)两侧的第四纪地层和阶地，对隐伏断裂的活动性进行研究。孢粉分析和¹⁴C测年数据表明，大凌河大榆树堡—凌海市段一级阶地形成于晚更新世至全新世，二级阶地形成于晚更新世，三级阶地形成于中更新世至晚更新世早期。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。晚更新世以来这一地区的地壳平均上升速率为0.20～0.28mm/a。

关键词: 大凌河, 隐伏断裂, 第四纪, 阶地