极值在地磁日变曲线中作为特征量而引人注目。本文在对无锡台历年(1977—1981)地磁(Z)资料进行分析处理后,对该台Z分量极值的时态分布、位移特征,及与地震之间的可能联系进行探讨。一上午高值时态分布特征在地磁日变曲线中,以低值为界,可见到上午高值和下 Extreme value in the geomagnetic diurnal variation as a feature amount of attention. After analyzing and processing the geomagnetic data of the calendar year of Wuxi (1977-1981), this paper discusses the temporal distribution of extreme value of Z component, the displacement characteristics and the possible connection with earthquakes. A high value of the temporal distribution of the characteristics of geomagnetic diurnal variation curve, with low values ​​as the boundary, we can see the morning high and under