张北6.2级地震的断层形变速率异常

利用北京地区 1994～ 2 0 0 0年的跨断层形变资料 ,研究了张北地震的形变前兆规律。以形变速率值和基准值之比作为异常参数 ,定量分析了北京地区 1995～ 1999年的异常及其与本区及邻区中强地震的关系。结果表明 ,异常出现后的 0 .5～ 1年内 ,都有中强震发生 ,而在 1997～1998年近 2年内异常数都超过 6次 ,其间即发生了张北 6 .2级地震 ( 1998年 1月 )

ANOMALY OF CONCERNED FAULT DEFORMATION RATE RELATED TO ZHANGBEI EARTHQUAKE OF 6.2

The deformation precursor law of the Zhangbei Earthquake was studied using the cross-fault deformation data from 1994 to 2000 in the Beijing area,and the relation of the anomalies from 1995 to 1999 in the Beijing area to the medium-strong earthquakes in this and adjacent areas was analyzed quantitatively by taking the ratio of deformation rate to datum value as the anomaly parameters.The results show that in most cases medium-strong earthquake occurs in 6～12 months after the anomalies.In 1997～1998 the number of anomaly was over 6 and in that peried the Zhangbei Earthquake of 6.2 occured(in Jan.1998).