【摘要】 分析了地磁垂直分量日变幅逐日比值的高值异常与其后地震的关系，发现它们之间有良好的对应，通过分析地磁垂直分量谐波幅度的逐日比，作者认为这种高值变化可能与其间地下介质电阻率下降有关，但也有可能是外场变化所致。更多还原

【Abstract】 In this paper, we found that the ratios of daily variation amplitude of vertical geomagnetic component can show the conductivity change of the underground medium. We also give calculation using day - by - day ratio method based on the information above, and we found this method is feasible and effective.更多还原