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通过对严格选取的我国大陆１９６５年以来的１０８个地震序列震级结构特征的研究，分析了大多数地震序列震级结构不符合古登堡李克特（ＧＲ）关系的原因，提出了分段拟合地震序列震级结构的方法，并着重研究了分段拟合震级结构在大震级段的特征值．其中特征震级百分比ｆ和大震级段斜率ｂ２的特征意义最为显著，它们对于不同类型的地震序列是有差别的．结果表明，有５２．８％的地震序列震级结构的ＮＭ图象在不到８０％最大震级处开始不符合ＧＲ关系，而且只有１８．５％的地震序列震级结构在大震级段ＮＭ关系呈下降趋势．当ｂ２＜０或０≤ｂ２＜３．０而ｆ又较小时，地震序列除主震外强震发生得较少；当ｂ２≥３．０时，地震序列往往伴有多次强震发生；当０≤ｂ２＜３．０而ｆ又较大时，地震序列除主震外，比主震小一些的中等地震发生得较多．
Based on the study of the magnitude structure of 108 seismogenic sequences selected from mainland China since 1965, the reason why the magnitude structure of most earthquake sequences does not accord with Gutenberg-Richter’s (GR) This paper focuses on the method of fitting the magnitude structure of the earthquake sequence and focuses on the eigenvalues of the piecewise fitted magnitude structure at the large earthquake magnitude. Among them, the signatures of the percentage of feature magnitude f and the slope b2 of the large earthquake magnitude are most significant, which are different for different types of seismic sequences. The results show that 52.8% of the N-M images of earthquake-grade earthquake magnitude structures do not accord with the GR relationship at less than 80% of the maximum magnitude, and only 18.5% N M relationship showed a downward trend. When b2 <0 or 0≤b2 <3.0 and f is small, the earthquakes occur less frequently than the main shock; when b2≥3.0, the earthquakes are often accompanied by multiple strong earthquakes; When 0≤b2 <3.0 and f is large, the earthquakes except for the main shocks occur more moderately than the main earthquakes.