【摘要】 对1970年以来甘肃地区发生的13次小震群进行分析研究,发现它们均不同程度的表现出前兆性震群特征,其中10次震群之后在震中或其附近地区发生了中强以上地震。在深入研究这些震群的时、空、强特征和性质的基础上,对甘肃礼县震群进行了重点研究,该震群的h、k、u、ρ值均为异常,在震群结束2月后就发生了岷县—临潭—卓尼县5 2级地震。更多还原

【Abstract】 We studied 13 small earthquake swarms occurring in Gansu region since 1970 and found that these swarms have the characteristics of precursory swarms.More than middle-strong earthquakes occurred in focal areas or their vicinity after ten of these swarms.Based on thoroughly studying spatial-temporal and strength features of Lixian swarm,we gain the result that the swarm is a precursory swarm and h-value、k-value、u-value and ρ-value are anomaly indexes.Minxian-Lintan-Zhuoni M_S5.2 earthquake occurred after two months that the swarm ended.更多还原