【摘要】 拉脊山断裂带在遥感影像上具有明显的线性构造特征,由拉脊山北缘断裂带和拉脊山南缘断裂带向北东凸出的弧形挤压逆冲断裂带构成,成为北侧的西宁—民和盆地、南侧的循化—化隆盆地和东侧的临夏盆地等多个晚新生代断陷盆地的边界,拉脊山北缘断裂带全长230km,由数段弧状不连续的断裂带组成。拉脊山南缘断裂带全长220km,由5段不连续宽缓波状断裂带组成,其左旋活动形成了拉张型的山间盆地——千户盆地,左旋水平位移180~640m不等。历史上沿拉脊山南、北两侧发生过20余次5级左右中等破坏性地震,这与遥感解译该断裂带的几何特征相一致。更多还原

【Abstract】 Lajishan fault appears obvious linear tectonic characteristics in remote sensing photos,which is formed by the northern and southern marginal Lajishan faults in NE direction,and it is the boundary zone of Xining-Minhe basin in the north,Xunhua-Hualong basin in the south,Linxia basin in the east and other Late Neozoic era downfaulted basins.Lajishan north marginal fault is 230km long,formed by several arcuate discontinuous faults.Lajishan south marginal fault is 220km long,formed by five discontinuous wide gradual slope faults,and the sinistral motion formed an extensional basin named Qianhu basin,and the sinistral displacement is about 180～640m.There occurred 20 times about M 5 earthquakes in Lajishan,and this is in agreement with the results of remote sensing decryption.更多还原