Abstract: In this paper, six teen groups of seismological anomaly in Anhui province since 1970 have been analyzed. The authors try to find the force source of that“ there is an anomaly but no earthquake occurs”. Correlation is found between the situation that “there is an anomaly but no earthquake occurs” and moderately strong earthquakes in Xiayangzi fault. There would have groups of seismological anomaly in middle-western Anhui province when earthquake with ML≥ 5. 0 occurred in tectonic system of Xiayangzi fault. This phenomenon may indicate that the middle-western Anhui province is a strain-concentrated point during the development of the inhomogeneous strain field in East China, and also is a sensitive region of seismological anomaly. It is important to study the relation between anomaly and epicentral region in judging information about the coming strong earthquake.

Key words: Seismological anomaly, Group of anomaly, Tectonic field