滇西北及邻区现代构造应力场  

RECENT TECTONIC STRESS FIELD IN NORTHWEST YUNAN PROVINCE AND ITS ADJACENT AREAS

作　　者：谢富仁[1] 刘光勋[1] 梁海庆[1] 

机构地区：[1]国家地震局地壳应力研究所

出　　处：《地震地质》1994年第4期329-338,共10页Seismology and Geology

基　　金：地震科学联合基金

摘　　要：通过滇西北及邻区大量活动断层擦痕的测量和利用由断层滑动方向反演构造应力张量的计算方法，获得滇西北及邻区现代构造应力场特征：区域现代构造应力场以水平作用为主，在滇西北地区，最大主应力方向为北北东；在滇西北外围地区，最大主应力方向为北北西或北西。在构造应力场分析的基础上，依据活动断裂构架及运动组合特征，提出了滇西北反“Ｓ’型右旋扩展的构造成因模型。Based on the investigation of active faults in region we have obtained the recent tectonic stress field in Northwest Yunnan Province and its adjacent areas using the method of determina-tion of principal stress axes from field measurements of slickensides. The result shows that thereceut tectonic stress field in the region is characterized by horizontal componment. The directionof maximum principal stress in Northwest Yunnan is different from that in the surrounding ar-eas. Analysis of active tectonic pattern shows that Northwest Yunnan active tectonic region is aantithetic S extension region with NW-trending strike slip faults. This may be better for explain-ing the tectonic origin and the state of recent crustal stress in the region.

关 键 词：滇西北 断层滑动方向 构造应力场 

分 类 号：P554[天文地球—构造地质学]