太行山东麓汤西断裂南段活动特征分析

采用槽探、年代样品测试、阶地调查和形变测量监测等方法,对太行山东麓汤西断裂南段进行研究,分析其活动特征。结果表明,汤西断裂发育于中更新世,历经多次活动,断裂并未上延到上更新统地层中,其南段的活动强度较高,最新活动年代为中更新世;汤西断裂西代村场地的垂直形变监测(1999~2014年)结果存在异常,综合监测点数据和区域新构造特征分析发现,该异常可能是研究区区域形变场的反映,并非由汤西断裂活动引起。

Analysis on the Activity Characteristics of the Southern Segment of Tangxi Fault at the Eastern Foot of Taihang Mountain

The southern section of the Tangxi fault of the Taihang Mountains is studied by means of troughing, dating test, terrace survey and deformation measurement monitoring. The activity characteristics of the southern section of the Tangxi fault are analyzed and discussed. The results show that the Tangxi fault developed in the Middle Pleistocene and experienced many activities. The activity intensity in the southern segment of the Tangxi fault is relatively high,and the fault does not extend to the Late Pleistocene strata. The era of latest activity of the southern section of the Tangxi fault is the Middle Pleistocene. The results of vertical deformation monitoring of Xidaicun site in Tangxi fault (1999-2014) are abnormal. Based on the data of all monitoring points and regional neotectonic characteristics, the abnormality may reflect regional deformation in the working area, not caused by Tangxi fault.