山西地震带近期水平运动状态及活动性

PRESENT CRUSTAL HORIZONTAL MOVEMENT AND ACTIVITY OF SHANXI FAULT BELT DETERMINED BY GPS

利用山西地震带３ 期ＧＰＳ复测资料（１９９６～１９９８），计算并分析了该带近期的水平运动状态，结果表明： 山西断裂带现主要受来自北西、北西西—南东、南东东向压应力场的控制，不存在明显的走滑运动；运动强度在空间上表现为北强南弱，在时间上表现为前弱后强；局部区域的应变量级达到１０－ ６。

By use of the repeated GPS observation data (1996～1997～1998), the present state of crustal horizontal movement along Shanxi fault belt is analyzed. The results show that: (1) the activity of Shanxi belt is controlled by the NW,NWW-SE、SEE compressive stress, and there is not strike slip movement; (2) the horizontal movement in the south is less active than that in the north; (3) the motion in 1997～1998 is stronger than that in 1996～1997 and the maximum value of local strain reaches 1×10 -6 .