张北-尚义地震前太平庄井地下流体中短期异常

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

INTERMEDIATE SHORT TERM ANOMALY OF UNDERGROUND FLUID IN TAIPINGZHUANG WELL BEFORE THE ZHANGBEI SHANGYI EARTHQUAKE

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. S