Abstract: We analysed and calculate spatial centrality and inhomogeneity of precursory anomalies in Liaoning region, China since 1988. The results show that the inhomogeneity index C_V value of the anomaly distribution in the short to medium term appeared obviously high value(more than or equal to one times of mean square) 1 to 3 years before M≥5.0 earthquakes happened in Liaoning and its adjacent area. The R_V value of the anomaly distribution concentration was correlated positively with the anomaly frequency, negatively with the maximum magnitude, and could be used as the indicators in combination with the C_V value. On condition that the C_V value appeared high value, and the R_V value was lower than the mean value and close to 30 km, M≥5.0 earthquake would have a high possibility in Liaoning for the next year.

Key words: Precursory anomaly, Inhomogeneity, Concentration, Liaoning region