鲜水河—小江断裂带7级以上强震rn构造区的划分及其构造地貌特征

摘要

划分了鲜水河—小江断裂带7级以上历史地震的强震构造区，分析了各强震构造区地质构造和构造地貌特征．认为强震构造区是沿断裂带的一些特殊构造段落，区内以断裂带主要分支断层的左阶斜列、并行排列或三叉构造组合为主体构造格局．强震构造区内发育了构造较复杂的盆地类型，如三叉区拉分盆地、双阶区拉分盆地和阶区-三叉区拉分盆地等．%Seismo-tectonic areas of historical strong earthquakes with magnitude MS≥7.0 along Xianshuihe-Xiaojiang fault zone are divived, and their individual fault pattern and tectonic geomorphology are analysed. Those strong earthquake areas are located in some special parts of the fault zone, where the major branch-faults of the fault zone form left stepping, parallel, and fork-like patterns. In the strong earthquake areas structurally complicated basins are developed, such as pull-apart basins in fork-like area, in double stepping area, and in stepping and fork-like areas.