宁波皎口地震的记录波形特征研究

最近两年，皎口地震的频度和强度都已达到了本世纪以来宁波市乃至浙江省的最高水平。本文选择了宁波台记录该地区地震的部分典型图形进行了研究。通过分析计算对皎口地震的记录波形特征有了几点初步认识：（１）初动符号随时间具有优势分布特征；（２）振幅比变化范围大，显示该地区震源错动方式是紊乱的；（３）记录波形的震相较简单；（４）初动位移量ＡＮ＜ＡＥ＜ＡＵ；（５）最在振幅波形偏向无规律；（６）ＳＭ波周期０．２ｓ左

Research of the recording wave features for Jiaokou earthquakesin Ningbo area

Near recent two years,the frequency and strengthof the Jiaokou earthquakes has reached a highest level in Ningbo municipality and Zhejang Province since this century.Some typical waves of the Jiaokou earthquake recorded by Ninbo seismic station havebeen studied,and a few basic knowledges have been obtained:(l) first arrials have thefeature of preferred distribution with time;( 2)variation range in amplitude ratio islarge,it shows that of foci is disorder;(3)phases of seismogram are simpler;(4)firstarrial displacement components are A_N