地震过程中的大地电场变化特征  

THE VARIATION CHARACTERISTICS OF THE TELLURIC FIELD IN THE PROCESS OF EARTHQUAKE

作　　者：毛桐恩[1] 席继楼[2] 王燕琼[2] 尹淑芝 

机构地区：[1]中国地震局地球物理研究所,北京100081 [2]中国地震局分析预报中心,北京100036

出　　处：《地球物理学报》1999年第4期520-528,共9页Chinese Journal of Geophysics

基　　金：中国地震局95-04-05项目

摘　　要：根据国产ZD9A型大地电场仪在宝低地电台的记录结果，研究了1998年1月10日河北省张北地区6．2级地震过程中的大地电场变化特征．主要表现为：1．震前36天至发震当日出现大地电场日变异常簇;2．地震前后大地电场E的方位发生转动;3、大地电场E具有日变倍9（天）周期性和振幅｜E｜变化特征;4大地电场EW分量的极性变化．根据对这些特征的分析结果表明，它们有可能做为孕震进入短临阶段的前兆信息及识别标志．According to the seismic recording data obtained in the Baodi geoelectrical station by the ZD9A geoelectric-field instrument which made in China, we study the characteristics of the telluric field in the process of the earthquake Ms6.2 occurred in Zhangbei area of Hebei Province on the Jan, 10, 1998. The key features and some properties of the telluric field of are discussed as follows. 1. Clusters of the abnormal telluric field signal occurred 36 days before the earthquake and lasted till the earthquake occured. 2. The direction of the telluric field rotated. 3. The daily variation of the telluric field E had per 9(days) periodicity, and the amplitUde |E| showed abnormal changes. 4. The polarization of the EW component of the telluric field inverse. These characteristics and properties will become the pre-information of precursor signal and identifying marks of prediction for short-term or immediate earthquakes.

关 键 词：张北地震 大地电场 变化特征 地电场仪 地震前兆 

分 类 号：P315.7[天文地球—地震学]