摘要
经野外调查和验证,长江三峡狮子口地区的NNW向遥感线性形迹是地形、岩性和小型断层的反映。对区内断层带样品进行的同位素年龄测定,判定出青林口断层在距今49×r0~4a曾有轻微活动,其余的四条断层第四纪(240×10~4a)以来无活动。地貌、地质和微震(M<3)分布表明,这些断层现代是不活动的,非控震构造,对三峡水库、大坝工程稳定性无影响。
The NNW-trending linear traces in the Shizhikou area of the Three Gorges section of Changjiang River reflect the relief, lithologic features and small-scale faults. It is inferred from geologic and geomorphic data and result of isotopic dating that the Qinglin-kou fault was slightly activated in 49×104a B. P. The Jufang fault was not activated since 50×104a, and other three small faults were not been also activated since 50×104a, even in the Quaternary period. The geologic and geomorphic data and distribution of earthquake epicenters indicate that the NNW-trending faults in the studied area have not been active in recent time, and not the seismogenic and earthquake-generating faults either which would not have an influnce on the stability of the Three Gorge reservoir and its dam.
出处
《地震地质》
EI
CSCD
北大核心
1991年第1期78-86,共9页
Seismology and Geology
关键词
断层
活动
长江三峡
狮子口
Three Gorges on Changjiang River, Sizhikou area, Recent fault activity, Enginering-active fault
