泰安地震台GM-4仪观测中台阶干扰分析  

Reason for the steps in the GM-4 fluxgate magnetometer observation at Taian Seismic Station

作　　者：刘敏[1,2] 陈传华 张素琴[4] 

机构地区：[1]山东省地震局,中国济南250014 [2]北京大学地球与空间科学学院,中国北京100871 [3]泰安基准地震台,中国泰安271000 [4]中国地震局地球物理研究所,中国北京100081

出　　处：《地震地磁观测与研究》2012年第2期74-79,共6页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局三结合项目(项目编号:SD2010SJH01);全国地磁台网运行维护监督与观测质量监控管理(2200404)

摘　　要：自2008年12月以来,泰安地震台的地磁观测数据在Z分量一直存在一种出现时间和持续时间长度均不规则的小幅度台阶干扰。分析此种干扰的特点,在泰安地震台的相对记录室、绝对观测室和山洞等不同场地进行实地对比观测试验,确定干扰仅出现在相对记录室,应属于供电干扰。通过排查分析,最终确定照明电路是导致该干扰的原因。There has been disturbances of small steps in the vertical component （Z component） of the geomagnetic observation at Taian Observatory since December 2008 with no repetition in the occurring time and the lasting period. Based on the review of the characteristics of the disturbances, we carried out comparison observation with another instrument of different type in addition to the running GM-4 magnetometer. The comparison results showed that this kind of disturbances appeared only in the variometer room. After estimating each part of the electronic circuitry, the illuminating circuitry was cut off and the steps never showed up later. Something in the illuminating circuitry seemed to be the reason for the steps in the magnetic observation.

关 键 词：地磁观测干扰 Z分量 台阶干扰 照明电路 

分 类 号：P315.7[天文地球—地震学]