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Activity Research for the Dalinghe Hidden Fault

WAN Bo\ GAO Changbo\ WU Ge\ WU Mingda (The Seismological Bureau of Liaoning Province,Shenyang,110031) HOU\ Jianjun (Department of Geology, Peking University,Beijing,100871)  
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 14 C chronological data,the T\-1 terrace of Dalinghe river section from Dayushupu to Linghai city is formed between Q 3 and Q 4;T\-2 formed in Q 3;T\-3 formed between Q 2 and Q 1 3.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 Q 3 when T 3 formed.The average crust up rate in this area from Q 3 till now is 0 20~0 28?mm/a.
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