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根据武威盆地 7条河流的阶地测量资料和测年数据探讨了河流阶地变形与新构造活动的关系。河流阶地的变形特征反映出新构造活动的方式 ,断层活动以逆冲为主 ,河流阶地的错断状况表明活动断层活动的次数 ,盆地西部活动至少有 7次 ,东部活动至少有 5次 ;同时可表明断层活动的幅度与强度 ,以及不同时期活动强烈区具有迁移变化的特点。武威盆地晚更新世以来发育的第四纪断层主要有 3条 ,各条断裂活动次数、强度不尽相同 ,以山前断裂活动最为强烈 ,至今活动仍未停息。 6 0ka前后西部活动强烈 ,2 0ka以来东强西弱。
Based on the terrace data and dating data of seven rivers in Wuwei Basin, the relationship between the deformation of river terraces and the new tectonic activity is discussed. The deformation features of the river terraces reflect the way of new tectonic activity. The fault activity is mainly thrusting. The fault condition of river terraces indicates the number of active fault activities. There are at least 7 activities in the western part of the basin and at least 5 times in the eastern part. At the same time It can indicate the amplitude and intensity of fault activity and the characteristics of migration and change in areas with strong activity in different periods. There are mainly three Quaternary faults developed in the Wuwei basin since the late Pleistocene. The number and intensity of each fault are not the same, and the activity of the front of the piedmont is the strongest. So far, the activity has not stopped. In the west of 6 0 ka, there was a strong activity in the west and weakness in the east and west since 20 ka.