安塞县塌地发育区新构造应力场效应  

The effect of neotectonic stress field on landslides in Ansai County of Shaanxi Province

作　　者：武春龙[1] 姜永清[1] 

机构地区：[1]中国科学院水利部西北水土保持研究所

出　　处：《水土保持通报》1989年第3期40-44,共5页Bulletin of Soil and Water Conservation

摘　　要：遥感图象分析,揭示出在安塞县南部有塌地群发育。利用水系资料,求得塌地发育区新构造应力场的主压应力方向为N43°E。塌地移动方向存在两个优势方向,分别为NNE—SSW和EW,它与区域新构造应力场的剪切破裂面方向基本一致。重力平行与新构造应力场剪切破裂面的作用是沟谷边坡扩展过程的优势事件。Through wide field inventory, remote sensed image and topographicmap analysis, we found landslide groups and obtained the moving direction data of 162 landslides in southern Ansai county of Shaanxi Province.The moving directions of landslides have the preferential orientationsNNE-SSW and EW. In order to find a possible connection of landslideswith neotectonic stress field conditions, the 926 valley orientations havebeen measured on 1:100,000 scale topographic map. The preferential valleyorientations are N8°E and N77°E. Accordingly, they are considered asthe two shear directions of the local neotectonic stress field. Thus, oneof the principal stress directions has an orientation near N43°E, theother near S133°E, the first of these azimuths corresponding to the maxi-mum compression. Two of the shears can be compared with the movingdirections of landslides.

关 键 词：黄土地区 塌地发育 重力侵蚀 

分 类 号：S157.1[农业科学—土壤学]