EXTRACTING ANOMALIES FROM SEISMICITY AND SEISMOLOGICAL INDEXES IN NORTH CHINA BEFORE ZHANGBEI Ms6.2 EARTHQUAKE

A M_s6.2 earthquake occurred in Zhangbei Shangyi area of Hebei province in Jan 1,1998.Some obvious seismicity anomalies appeared in North China region before the event.China seismological Bureau had given a successful medium term prediction for this quake,but no imminent prediction.In this paper,according to the characters of local seismicity before the event,we pick up some seismological anomalies through Gl spatial scanning,and the focal region is determined.The result is ideal.