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采用多因子分析的主成分分析法,选择与地震活动强度有关的地震频次N(ML≥3.0)、b值、η值、Mf值、A(b)值和Ac值等6个参量进行分析,实现对上述参量的有效约简,得到反映地震强度特征的综合指标W。发现指标W在辽宁海城7.3级、岫岩5.4级地震前出现明显的异常变化,震后恢复。表明综合指标W可以较好的反映地震活动的异常特征。
The principal component analysis of multi-factor analysis was used to analyze six parameters such as seismic frequency N (ML≥3.0), b value, η value, Mf value, A (b) value and Ac value related to the seismic activity intensity. Realize the effective reduction of the above parameters, and get the comprehensive index W reflecting the characteristics of earthquake intensity. It is found that the index W shows obvious anomalous changes before the 7.3 magnitude of Haicheng, Liaoning Province and the M5.4 Xiuyan earthquake, and recovered after the earthquake. It shows that comprehensive index W can better reflect the anomalous characteristics of seismic activity.