新构造应力场与滑坡侵蚀

Neotectenic Stress Field and Landslide Erosion

根据水系地貌学数据研究认为黄土高原新构造应力场的主压应力方向为Ｎ５８°Ｅ，其起源于印度板块和欧亚板块的碰撞。野外调查和遥感地图分析，发现了安塞县南部的古滑坡侵蚀群，滑坡移动方向受控于新构造应力场。长武王东沟现代滑坡移动方向与新构造应力场的主压应力方向一致。

Geomorphlogical and Seismological data were used to determine the orientation of the principal large regional neotectonic mormal seress directions in Loess Plateau.It is shown that the maximum pressure is oriented N58°E.This may be an indication that aparts the effect of the collosion between the Eurasian and Indian tectonic plates.Through wide field inventory,remote sensing image and topographic map analysis, landslide erosion groups were found in southern Ansai county of Shaanxi province,and the moving directions of landsides had the proferential orientations NNE SSW and EW.Two of shears of neotectonic stress field can be compared with the moving directions of landslides.The landslide moving direction of Wangdong Gully in Changwu county,Shaanxi province corresponded with maxim pressure direction of neotectonic seress field.The landslide erosion is main reason for seidiment yield in watershed.