【摘要】 计算分析了银川台１９８３年１月～１９９６年１０月的地磁周期Ｔ＝９～２００ｍｉｎ的复转换函数Ａ的模｜Ａ｜、总误差σｚ和帕金森矢量或韦氏矢量，并将其在银川台４００ｋｍ范围内８次中强地震发生时的变化进行了研究。结果表明：周期为１２、２０、２６、３５、４５、６０、７５、９０ｍｉｎ的｜Ａ｜、σｚ磁方位角αｐ及其方差Δαｐ在震前有明显的异常变化，帕金森矢量或韦氏矢量在震前指向震中。更多还原

【Abstract】 The modules |A| of complex transfer functions for the geomagnetic field with the periods of T=9～200 minutes from January 1983 to October 1996 at Yingchuan seismic station are calculated and analyzed as well as the overall error σz and Parkinson or Wiess vector.The variation of those for 8 moderate and strong earthquakes 400 km far from Yingchuan station are studied.The study showed that the |A|,σz,magnetic azimuth αp and difference Δαp varied abnormously at the periods 12,20,26,35,45,60,75 and 90 minutes and the Parkinson or Weiss vector pointed toward the epicenters before the earthquakes.更多还原