北祁连地区震前重力场变化特征

CHARACTERSTICS OF GRAVITY FIELD CHANGE BEFORE EARTHQUAKE IN THE NORTH QILIAN AREA

分析讨论了１９９１年１月２日和１９９２年１月１２日两次中强地震前重力异常变化及其与地震的对应关系，指出这两次地震都发生在重力变化高梯度带附近。

The anomalous variations of the gravimetric values before both Qilian(Ms=5.1, 1991) and Jiayuguan(Ms=5.4,1992) earthquakes are discussed in detail.It is indicated that both of the earthquakes occured in the high gradient zone of gravity change.