Abstract: North Zhongtiaoshan Fault is the main boundary fault of the southern margin of Yuncheng basin at the southeastern margin of Ordos block, which controls the tectonic evolution of Yuncheng basin. Sliding rate is one of the most important parameters for quantitative study of active faults, and it is also a direct reflection of the mode and intensity of fault activity. The value of sliding rate in this section is of great significance for seismic risk assessment and medium-and long-term prediction of Yuncheng Basin. Focusing on the Haizhou section of the north piedmont fault in Zhongtiaoshan Mountains, by using the methods of high resolution remote sensing influence interpretation, geological and geomorphological investigation, UAV survey, fault profile analysis and stratigraphic dating, we studied the Late Quaternary activity habits, geomorphological surface deformation and activity rate of the fault in detail. Three main points were obtained, ① there are a series of secondary faults parallel to the main fault in Haizhou section of North Zhongtiaoshan Faults, The closer to the basin, the later the faults developing and the stronger their activity; ② there are three main stages of alluvial fans in Yanchi area since the late Pleistocene, and the abandoned age of the first stage of alluvial fans is 14.1~15.7 ka, the average cutting height being 10.2~11.7 m; and the average vertical slip rate of faults is 0.65~0.83 mm/a; ③ the average vertical slip rate of faults in south Xiaolicun is 0.45~0.62 mm/a since (15.7±2.5)ka; the average vertical slip rate since (107.4±18.6)ka is about 0.1 mm/a, and the activity of faults in Late Pleistocene is gradually increasing.

Key words: Yuncheng Basin, North Zhongtiaoshan Faults, Late Pleistocene, Sliding rate