We analysed and calculate spatial centrality and inhomogeneity of precursory a-nomalies in Liaoning region, China since 1988. The results show that the inhomogeneity index Cv 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 Rv 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 Cv value. On condition that the Cv value appeared high value, and the Rv 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.%通过对1988年以来辽宁地区年度前兆异常空间分布特征的分析与计算,结果发现,辽宁及邻区5级以上地震前1～3年中短期异常空间分布非均匀性指标CV值均出现明显的高值(大于等于2倍均方差).异常空间分布集中度RV值与异常频次正相关,与最大震级反相关,可作为参考指标,配合CV值使用.当CV值出现高值异常期间,若RV低于均值并接近30 km时,1年内辽宁地区发生M≥5.0地震的可能性较大.
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