东南沿海地震带的地震丛集窗及震级结构特征分析

基于东南沿海地震带的地震活动特点和构造背景, 确定了若干个地震活动特别集中的区域, 并引入地震丛集窗和震级结构的概念分析这些区域的局部特点。结果表明, 这些地震丛集窗的地震活动水平变化反映了所属大区的应力状态, 当某个地震丛集窗发生震级结构异常, 具备前兆震群特征的地震密集事件时, 该地震丛集窗内或其相关部位的介质性状可能发生了变化, 这对以后可能对应发生中强地震或强震具有一定的中期预测效能。

A study on the seismic swarming windows and magnitude structure features of the Southeast China coastal seismic belt

On the basis of the seismic activity feature and tectonic background of the Southeast China coastal seismic belt, several locations where seismic activity is highly con-centrated are determined, and the seismic swarming windows and magnitude structure concepts are introduced to analyze the partial features of these locations. The results show that the seismic activity level changes of these seismic swarming window sreflect the stressstate of the large area where the earthquakes occurred. When some seismic swarming windows show the anomaly of their magnitude structure and seismic swarming events with the features of precursory seismic swarms, it probably indicates that the medium properties of those seismic swarming windows or their related parts have been changed. Therefore, this method has some efficiency in mid-term prediction of the moderately strong earthquakes or strong events.