地磁场Z分量的年变化  

ANNUAL VARIATION OF Z COMPONENT OF GEOMAGNETIC FIELD

作　　者：解用明[1] 马喜龙[1] 韩宝善[1] 董承发[1] 

机构地区：[1]河北省地震局,石家庄050021

出　　处：《华北地震科学》1998年第2期64-68,共5页North China Earthquake Sciences

摘　　要：利用河北省及邻区共8个台的绝对磁测Z分量的资料，分析了地磁场Z分量的年变化。结果是，曲线相对长斜线而言，一年中形成两个峰值，时间在4月份和10月份前后。每年1、7、12月份为低值，7月份最低。相对长斜线的年变最大幅度各台变化不大，有从南往北逐渐加大迹象，但是各台的年变化幅度又随时间而有较大差异。认为同时间里各台Z分量的变化差异，主要是各地长期变化速率不同引起的。认识了地磁场Z分量这些变化特征和规律，更好地发挥地磁手段在短临预报中的作用。The Z component data of absolute magnetic surrey at 8 stations in Hebei Province and its sdjacent region are used to analyze the annual variation of Z component of geomagnetic field. The result is, for the curve against long oblique line, two peak values were formed before or after April and October in a yeat. The low values are in January, July and December, the lowest one in July every year. Against the maximum amplitude of annual variation of the long oblique line, the variation of various stations is little, showing a sign to gradully increase from south to north, but the annual variation amplitude of each station showed relatively large difference with time. Meanwhile, it is considered that the variation of z component of each station is different,which was caused mainly by different variation rate of long-term variation in different localities. After these variational characteristics and laws of Z component of geomagnetic field are recognized, the geomagnetic surrey method can play a better role in short-term and imminent earthquake prediction.

关 键 词：地磁物 Z分量 年变化 地磁变化 地震预报 

分 类 号：P315.7[天文地球—地震学] P318.5[天文地球—固体地球物理学]