Abstract: Two parameters δN,δE, deseribing the pattern of seisrnieity anomaly before stronge arthquake were proposed in this paper,and it was used in North China,Xinjiang and South-North seismic zones.The predietability of those two parameters was tested;the relation between the anomalous distribution Pattern and the Position of stronge arth-quakes was studied.The results show that those two parameters could better express the anomal ous seismic quiescence and anomalous seismic clustering within the seismic zonebe-for estrongearthquakes.From the time-space anomalous pattern of δN,δE we can see that the anomaly distributed around the epicentral area from three months to one year before moderately stronge arthquakes obviously,and with the time approaehing to the origin time of an earthquake,the size of anomalous area is relevant to the earthquake magnitude.Re-gardless of the variation of pattern with time,we just regard the earthquake oeeurred in one year after anomaly appearing as corrcet foreeasting,the foreeast evaluation marks R for three seismice zones are greater than 0.5。

Key words: Earthquake predietion, Seismieity, Temporal-spatial dynamic pattern