地震时空丛集程度的度量及震前异常特征初探

从Ｍｏｒｉｓｈｉｔａ空间丛集度出发，定义出其时间丛集度的表达式，并计算了几次大震前空间丛集度Ｊｓ和时间丛集度Ｊｔ的时间扫描曲线。从计算结果分析，无论是空间丛集度Ｊｓ还是时间丛集度Ｊｔ在大震发生前大都会出现高值异常。将Ｊｓ和Ｊｔ做了对比，从而对Ｍｏｒｉｓｈｉｔａ指数的含义进行了探讨，分析了各自的优缺点。结果表明，Ｊｓ和Ｊｔ可以做为一项地震活动性指标引入到地震预报中来

MEASURING OF CLUSTERING DEGREE IN TEMPORAL AND SPATIAL DISTRIBUTION OF EARTHQUAKES AND INITIAL RESEARCH OF ANOMALY CHARACTERISTICS BEFORE EARTHQUAKES

In this paper, according to Morishita's spatial clustering degree, defined formula of temporal clustering degree and calculated time scanning curves of spatial clustering degree J s and temporal clustering degree J t before some large earthquakes. The results show that J s and J t have high value anomaly before large earthquakes. Compared J s with J t, discussed their features and ana lysed respective advantage and shortcoming. Obviously, J s and J t, as an index of seismicity, can be used to predict earthquake.