河西—祁连山东部地区北东向构造形变特征及其地震活动

DEFORMATION CHARACTERISTICS OF STRUCTURE IN NE DIRECTION AND SEISMIC ACTIVITY IN EASTERN PART OF HEXI AND QILIAN

近20年来河西-祁连山东部地区三条规模较大的北东向构造带在区域垂直形变图上反映明显。因受区域应力场强度的控制,其垂直形变表现出随时间波浪状演化式。区域垂直形变图像与莫霍面等深线相似,说明这几条北东向构造带的深部成因机制。它们对区内的中强地震起着很强的控制作用,与北西西及北北西向断裂构造共同构成了本区的控震构造网络。

There mainly exist three NE structure zones in eastern part of Hexi-Qilian Region. They are clear on recent regional vertical crust deformation map. The undulate evolution of vertical deformation field of the NE tectonic zones. The NE structure zones is controlled by regional stress field. The similarity between regional deformation map and bathymetric chart of Moho shows the plutonic mechanism of the NE structure zones The NE structure zones have important control effect to medium and strong earthquakes in the region. The NWW,NNW and NE structures together have formed an earthquake-controlling structural network.