Abstract: his paper present the anomalies of underground fluid in the Taipingzhuang well of Beijing suburbs which appeared several times before the Zhangbei Shangyi M 6.2 earthquake.Though these anomalies seem to be related to Zhangjiakou M 4.2 earthquake of May 25,1997 and Wulatehouqi M 5.0 earthquake on October 21,1997,we consider that the anomalies and the earthquakes should be regarded as the respond to crust activity in the north area of North China and increase of stress in the regional stress field.So it can be identified as the intermediate short term precursor of Zhangbei Shangyi M_s 6.2 earthquake January 10,1998.

Key words: Mediumterm anomaly, Shortterm anomaly, Earthquake precursor, ZhangbeiShangyi earthquake, Underground fluid

摘要： 张北-尚义地震前,北京太平庄井地下流体多次出现异常,这些异常虽然在时间上与1997年5月25日张家口4.2级和1997年10月21日乌拉特后旗5.0级地震相对应,但笔者认为应该将这些异常群体与地震活动都看作是华北北部地区地壳活动的反应,是整个区域应力场应力不断增强的反应,是张北-尚义地震的中短期前兆异常。

关键词: 中期异常, 短期异常, 地震前兆, 张北-尚义地震, 地下流体