2012年9月7日彝良5.7、5.6级地震的近场异常  

Near Field Anomalies of Yiliang M5.7,5.6 Earthquakes on Sep.7,2102

作　　者：何德强 李亚芳 佘如昌 梁冰 曾子明 申玻 

机构地区：[1]昭通市防震减灾局,云南昭通657000

出　　处：《地震研究》2014年第1期1-8,171,共8页Journal of Seismological Research

基　　金：云南省人民政府十项重大措施监测预报(JCYB-20080601-05)项目资助

摘　　要：通过对2012年9月7日云南省昭通市彝良县洛泽河一带5.7、5.6级地震前近场区的地震活动和前兆异常研究,总结得出地震活动异常主要为"震前4级地震活动水平增强、出现小震活动空区,孕震早期有‘信号震’,短期出现‘逼近地震’";前兆异常开始于震前1年左右,流体异常早于形变异常,短临阶段前兆异常有由外围向震中迁移的现象,临震异常出现的时间较为集中,主要在9月1日和5日2个时间点。Research on seismic activity and precursory anomalies in the near field before the M5.7,5.6 earthquakes in Luoze River of Yiliang County in Zhaotong on Sep.7,2012,we summarized the maim characteristic of seismic activity before Yiliang M5.7,5.6 earthquakes is that the increasing of M4.0 earthquakes activity and small earthquake activity gap appeared before the earthquake,‘ signal shock’ appeared in the early stage of earthquake preparation and the impending earthquakes appeared in a short time.Precursory anomalies had begun in one year before the earthquake and fluid anomalies occurred earlier than deformation anomalies.In the short-term and impending stages,the precursory anomalies migrated from the periphery to epicenter and the appearance time of impending anomalies mainly focused on Sep.1 and Sep.5 in 2012.

关 键 词：彝良5 7、5 6级地震 近震源区 地震活动异常 前兆异常 

分 类 号：P315.7[天文地球—地震学]