【摘要】 1999年 9月 2 3日开始发生的福州震群 ,由于距离市中心很近 ,加之紧随“9 2 1”台湾集集 7 6级大地震之后 ,且该区域曾经是极少震区域 ,因此引起了广泛的关注。本文分析了此次震群活动的时间和空间分布特点 ,表明存在着显著的密集震级、密集时段和密集区域等震级结构特征 ,意味着福州地区中层地壳介质中易于产生中强以上地震的层位可能形成了小尺度的宏观起始破裂面 ,一定程度上存在着未来中长期中强以上地震的危险性。更多还原

【Abstract】 On September 23,1999,an earthquake swarm occurred in Fuzhou.Because the region where earthquakes occurred scarcely before and it is very near the center of the city and short after the Jiji earthquake with M \-S 7\^6 of Taiwan,on September 21,1999.The earthquake swarm had been interested at home and abroad.In this paper,we analyzed the characteristics of spatial and temporal distribution of the earthquake swarm and validate magnitude\|number constituent of the swarm is special.In present theory,the earthquake swarm means that a macro original rupture had formed in the layer where moderately strong earthquake risk on the site.We proposed that further observation and basic research should be carried out for the purpose of protecting against and mitigating earthquake disaster in provincial capital of Fujian Province where the population is dense and economy is developed.更多还原