河北省数字地电场数据分析  

Analysis on Digital Geoelectric Field Anomalies in Hebei Province

作　　者：张学民[1] 郭建芳[2] 郭学增[2] 

机构地区：[1]中国地震局地质研究所 [2]河北省地震局,石家庄市槐中中路262号050021

出　　处：《中国地震》2006年第1期64-75,共12页Earthquake Research in China

基　　金：国家科技攻关项目(2004BA601B010503)资助。

摘　　要：通过分析总结河北省数字地电场的正常场和异常信息,发现正常记录除了显示日变周期外,还记录到了半日和三分之一日周期,比较长的周期还有半月周期等;干扰信息主要与电极极化及磁暴等有关,大磁暴干扰一般会出现高频信号,破坏正常日变形态,其主要表现为多台同步等幅信号;对台站的电场方向性研究发现,在正常时段电场记录方向性显著,而磁暴记录期内方向性较差,显示外空异常源方向比较复杂。最后对一些可能与地震有关的异常现象进行了分析探讨。我们认为,目前的多极距地电场观测对排除干扰及异常识别带来很大方便,但共用电极的观测方式为异常识别增加了障碍。The normal and anomalous data of digital geoelectric field in Hebei Province were analyzed. It is found that the normal field recorded at stations consisting of not only daily variation, but also semi-diurnal and a-third-diurnal period variation, and semi-lunar wave with longer period. Main anomalies are dipole polarization and magnetic storms. Big magnetic storms always cause high-frequency signals, destroying the daily variation, which were presented at many stations with similar amplitude at the same time. The directional properties on a station show that, the direction of geoelectric field is apparent and steady in normal time intervals, but scattered during time of large magnetic storms, which present that the sources of external space are distributed complicatedly. Finally, some anomalous signals before earthquakes were analyzed and discussed. We think that, it is convenient to distinguish the anomaly with different directional and multi-dipole observations at the stations, but the arrangement of common electrode adds difficulties in anomaly analysis.

关 键 词：地电场 磁暴 多极距观测 方向性 阶变异常 

分 类 号：P315[天文地球—地震学]