关键词: 断层陡坎, 侵蚀作用, 微地貌, 平谷地区

Abstract: Based on observation and comparison to the surface scarps of the Pinggu-Sanhe area, the mirco-geomorphy differences between the river erosion scarp and fault scarp are studied. Direction of scarps caused by river erosion follows the river, is unstable and the tendency of scarps is symmetric along the river. While distribution of fault scarps is not influenced by the river direction. If the fault is dominated by normal slip, motion direction of both sides of scarps is stable. Study results indicate that the surface scarps of the Pinggu area are river erosion scarps. Characters of river erosion sediment and fault dislocation sediment are analysed from structural geomorphy and stratigrapic sedimentography. It is suggested that there are two possible interpretations for the data of shallow seismic exploration and boring in the Pinggu area.

Key words: Fault scarp, Aggressive action, Microgeomorphy, Pinggu area