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系统研究了1985年以来江苏及邻区的36次小震群,结果表明,江苏及邻区的地震具有成丛活动的特点,每一丛地震活动持续时间和平静时间没有明显的周期性,这反映了它是在一定的外部应力环境控制下发生的。江苏及邻区地震的成丛活动与台湾地区7级以上强震有一定的呼应关系,多发生在台湾地区7级以上强震前后。分析表明,台湾地区7级以上强震孕育范围较大,明显影响和控制了江苏及邻区的震群活动,而江苏及邻区的震群活动对大范围区域应力场的增强具有指示意义,对台湾地区7级以上强震的发生也具有一定的中短期指示意义。
The study of 36 small swarms in Jiangsu and its adjacent areas since 1985 shows that the earthquakes in Jiangsu and its adjacent areas have the characteristics of clumping, and there is no obvious periodicity in the duration and calm time of each clump. It reflects that it is under the control of certain external stress environment. The conglomeration of earthquakes in Jiangsu and its adjacent areas has a certain echo relationship with strong earthquakes of magnitude 7 or higher in Taiwan, mostly occurring before and after the earthquakes of magnitude 7 or above in Taiwan. The analysis shows that a large range of strong earthquakes above magnitude 7 in Taiwan was conceived, which obviously affected and controlled the swarm activity in Jiangsu and its neighboring areas. However, the swarm activities in Jiangsu and its adjacent areas were instructive for the enhancement of the stress field in a large area. It also has certain medium and short term significance to the occurrence of strong earthquakes of magnitude 7 or above in Taiwan.