【摘要】 郯庐断裂带(即郯城-庐江断裂带)是纵贯中国东部大陆边缘的一条巨型断裂带,整体为北北东走向。它的形成和演化对中国东部中生代以来的地质演化有明显控制作用,同时又是一条现今地震活动较为活跃的地震带,因此对郯庐断裂带周边构造应力场的研究具有重要的意义。采用野外观测取得的10个测点共206条活断层擦痕数据,利用断层滑动资料反演构造应力张量的方法,计算获得了研究区现代构造应力场主要特征:郯庐断裂及其周边地区现代构造应力场以北东-东西向挤压、北西-近南北向拉张为特征,其最大主压应力(σ1)方向为64°一106°,平均倾角23%最小主压应力(σ3)方向为332°~14°,平均倾角14°;中间主应力(σ2)倾角较陡,近垂直,应力结构为走滑型。更多还原

【Abstract】 The Tan-Lu fault zone is a large-scale strike-slip fault zone and important geological boundary striking NNE in east China,its formation and evolution of the geological evolution since the Mesozoic in the east China has obvious control effect,at the same time,it is a belt of seismic activity today,so the study of tectonic stress field of surrounding the Tan-Lu fault zone has an important significance.According to field seismo-geology investigation and fault slip observation,we got 206 data of active fault slickensides.And using the method of inversion of fault slip data,we can obtain following characteristics of recent tectonic stress field in the research region.It is characterized by near NE-SW maximum compressional stress and by near NW-SE minimum extensional stress in the Tan-Lu fault,and the stress regimes are all of strike slip.The direction of the maximum principal compressional stress（σ₁） is N64°W—N104CE,and the average dip angle is 23°.the minimum principal compressional stress（σ₃） is N322°W—N14°E,and the average dip angle is 14°,and the dip angle of middle principal compressional stress（σ₂）is nearly vertical.更多还原