柴达木盆地中部深部构造和地震活动

用航磁资料研究了青海柴达木盆地中部的深部构造环境。结果表明：该地区存在由东西向、北西向和北东向各两条断裂组成的构造系统；地震主要分布在由两条东西向断裂和两条北东向断裂交截形成的顺扭平形四边形的角区；构造应力场主压应力方向大致为近南北方向，在其作用下，北东向和东西向断裂都是该地区主要的发震构造。

DEEP TECTONIC AND SEISMICITY IN CENTRAL TSAIDAM BASIN

The deep tectonics in central Tsaidam Basin has been studied with aeromagnetic date.The studies show that there are six faults including each two in EW,NE and NW directions in the area,and earthquakes were distributed mainly in the corners of a dextral rhomboid tectonic-system that is composed of each two faults in EW and NE directions. The principal compressive stress is nearly in the NS strike. Under the action of such a stress,the faults in EW and NE directions are the major causative faults in this area.