The Characteristics of the Precursory Anomaly prior to the Yiliang Earthquakes,Yunnan,China on September 7,2012

查看全文 作　　者：Sun [1]Zongqiang;Shi [2]Yafang;Gao [3]Huayan;Rui [4]Wenjun;Feng [5]Liangliang;Xu [6]Fangfang;Cao [3]Xiaoli;Wang [7]Bin;Wang [8]Yongmei 机构地区：[1]Earthquake Prevention and Disaster Reduction Bureau of Shuifu County;[2]Guiyang Seismological Observatory;[3]Earthquake Administration of Lufeng County;[4]Earthquake Administration of Binchuan County;[5]Earthquake Administration of Baoji City;[6]Rongcheng Seismic Station;[7]Yancheng Seismic Station;[8]Earthquake Administration of Zhaotong County 出　　处：《Earthquake Research in China》索引2014年第28卷第2期,共11页 摘　　要：An analysis was carried out on the seismic activity and the precursory anomaly prior to the earthquakes in Yiliang on September 7,2012. The characteristics of the seismic activity,the dynamic changes of underground fluid and deformation were investigated. As a result of the investigation,we found that: before the earthquake,the seismicity level of M4. 0earthquakes had enhanced,and seismic gap of a small earthquake had appeared; the precursory anomalies emerged about 1 year before the earthquake; there was phenomenon of short-term anomaly migrating from the periphery to the epicenter area; the imminent anomaly appeared in a relatively concentrated period of time, a week before the earthquake. The research has shown a significant guidance for the analysis and prediction of strong earthquakes( Ml> 5. 0). 关 键 词：地震活动 前兆异常 特征 云南 中国 地震前 动态变化 地下流体