Abstract: Before the Zhangbei Shangyi M 6.2 earthquake,the anomalies of high value of subsurface fluids have appeared for more than two years in the north area of Noth China.Some anomalies of subsurfase fluids rose one after another and coordinated with some moderate and moderate strong earthquakes in 1997,and some typical short impending earthquake anomalies appeared 2 months earlier than the earthquake in the region of 100～200km away from the epicenter.These anomalies were traced for two years,with the improving of the understanding on earthquake risk,the short impending earthquake prediction was made successfully half month before the earthquake.

Key words: Earthquake prediction, Subsurface fluids, ZhangbeiShangyi earthquake

摘要： 张北-尚义地震前华北北部地区存在为期两年以上的地下流体高值中期异常;近一年来该区地下流体异常此起彼落并与某些中等或中强地震活动遥相呼应;震前两个月距震中100～200km的地区出现典型的地下流体短临异常。两年来跟踪上述异常,不断修正对震情形势的认识,震前半个月做出较为成功的短临预报。

关键词: 地震预报, 地下流体异常, 张北-尚义地震