给出一类周期特征值问题的向后误差分析，定义了特征对的范数型结构向后误差，并给出了显式表达式。
The normwise structured backward error of an approximate eigen-pair is defined and its explicit formula is given.
为了对比分析衰减关系的影响，编图中也采用了借助误差向后传播算法建立的地震烈度衰减关系。
For comparing and analyzing the influence of attenuation relationship, the attenuation relationship of earthquake intensity created by the error back propagation approach was adopted in mapping.
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