根据断裂构造的判读标志,在南水北调西线工程区共存在NW,NE,SN和EW向四组断裂近200条,NW向断裂为区域性的断裂构造,控制工程区地貌、水系等的发育。其中,有22条断裂规模较大,对输水线路存在相对较大的影响。野外考察结果表明,区内有5条全新世时期的活动断裂和12条晚更新世时期的主干和区域性大断裂。通过综合分析发现,5条全新世时期的活动断裂因为离输水线路较远或未穿越输水线路,而12条晚更新世时期的断裂构造则因全新世以来没有活动,因而它们对工程区的影响总体上还是有限的,工程区处于一个相对稳定的区域,而区域构造分析的结果也说明工程区位于一个相对的安全岛内。

According to the interpretation marks of active faults,about 200 faults were interpreted,which strike northwest, northeast, south-north and east-west respectively. Northwest-trending faults have the largest scale and regional feature, controlling the development of landforms and water systems in the Project Area. Among them, 22 faults have relatively larger effects on water transfer project. Through the field observation, it has been shown that there are 5 active faults in Holecene and 12 huge active faults in later Quaternary. However, it has been discovered by synthetical analyses that these active faults don't have critical threat on the water transfer project because of long distance from the water transfer project or not passing through it or other factors. In summary, the water transfer project will be stable relatively through active faults analysis.