河西构造系及其与青藏高原东北部地震活动的关系

河西系是分布在青藏高原东北部地区的北10°-30°西向右旋挤压构造带的总称。其主体构造由三个隆起带、四个拗陷带及其间的断裂带组成。构造活动影响至地壳中下部,东部边缘构造带可深及岩石圈底部。河西系对地震活动具有明显的控制作用,中强以上地震主要发生在其一级隆起带边缘与北西西向断裂复合部位。

THE HEXI TECTONIC SYSTEM AND STUDY ON RELATION BETWEEN IT AND SEISMICITY IN NORTHEAST QINGHAI-XIZANG PLATEAU

The dextral compressive tectonic zones of N10°-30°W in Northeast Qinghai-Xizang Plateau is generally known as Hexi System. The system consists of three upwarped districts, four depressions and some fault zones located between the both of them. Its activity influences to the midlower crust, even to the bottom of lithosphere in eastern border. The Hexi System evidently control seismicity. Moderate earthquakes or greater ones mainly occurred in some parts where the edges of the first-class upwarped districts and the NWW fault intersect.