皎口与横溪地震波形特征分析与应用

通过对宁波地震台记录的横溪地震和皎口地震波形特征的对比分析，发现它们到宁波台的震中距基本相同。震相都较简单，记录波形衰减较快。不同点有：初动方向不同，ＡＰ／Ａｓ比值不同，ＳＭ波周期不同，利用这些不同的特征，对部分初动不清楚的小震定位判断，结果与宏观调查基本一致。

Waveform characteristics of Jiaokou and Hengxi earthquakes and its appl ication

By comparative analysis of waveform characteristics of Hengxi and Jiaokou earthquakes,it is found that their epicentral distances to Ningbo Station are almost the same,their seismic phases are all simple and attenuate quickly.It is also found that their first motion directions,their ratioes of A / A and their periods of SM wave are different.Using these characteristics,we give the locations of some minor earthquakes with unclear first motions.The results are coincident with that of macroexamination.