【摘要】 本文利用广州地磁台1961年4月至1963年3月记录到的连续磁扰变化,经过模数转换、谱分析和数字滤波,得到了大量不同短周期的磁变事件,再将周期相同的事件取三个月滑动组合求得转换函数。结果表明:广州台不同短周期的磁扰矢量△B在球极坐标上的投影均趋于同一水平面;转换函数A、B及帕金森矢量(Parkinson)长度CP随时间的异常变化与广东省河源县1962年3月19日Ms6.1级地震有关。本文还讨论了该台转换函数A、帕金森矢量长度CP及倾角I与地磁周期的关系,得到周期为9至40分钟时的A、CP、I之年均值与磁变周期呈线性相关。故认为研究广州台地磁周期小于40分钟的转换函数随时间的变化,可获得以电导率异常为标志的地震前兆信息。更多还原

【Abstract】 Based on the surveying data of the continous geomagnetic disturbance Variations recorded at the Guangzhou Geomagnetic Observatory from April 1961 to March 1963, and by using the methods of A/D converting, spectral analysis and digital filrteting, a great variety of magnetic variation events of different short periods have been foundand the transforming functions have been got by three months rolling-grouping of the events with the same periods. The results show that the projects on the sphevic polar coordinates of the geomagnetic disturbance vectors ( △B ) of different short periods tend to lying on the same horizantal surface; the anomalus variationes with time of the transforming functions A, B and the length of the Parkinson Vector Cp is related to the Ms 6.1 Earthquake of Heyuan, Guangdong occured on March 19, 1962. The relations between the geomagnetic periods v.s. the transforming function A, the Parkinson vector lehgth Cp, and inclination I have been investigated, showing that the annual average values of A, Cp and I of the periods rangins from 9 to 40 minutes being linearly correlated to the geomagnetic variation periods. Therefore, by researching the variations of the transforming functions of the geomag-netic periods less than 40 minutes the seismic precursors flagged by the electric conductivity anomaly could be seen更多还原