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引言地震预报的关键在于判定未来地震发生的时间、地区和震级。对大量地震震例资料的统计发现，相似的地震前兆异常有时对应近源区的地方震，而有时又对应远源区强震，这就为发震地区的预报带来了相当大的困难。因此，深入研究近震前兆和远场效应的特点和差异并探讨其成因、机
Foreword The key to earthquake prediction lies in determining the time, area and magnitude of future earthquakes. Statistics of a large number of earthquake cases show that similar earthquake precursory anomalies sometimes correspond to local earthquakes in the near source region and sometimes strong earthquakes in the far source region, which brings considerable difficulties in the prediction of the seismogenic region. Therefore, in-depth study of the characteristics and differences of near-earthquakes and far-field effects and their causes,