【摘要】 采用山西数字遥测地震台网的数字化地震波形资料,研究了山西洪洞地震前后P波初动符号、初动半周期、振幅比、S波衰减率、尾波持续时间比等地震波参数的异常特征,得出了地震前,小震P波初动符号一致性增强,初动半周期存在低值—波动—发震或低值—发震的时序演化过程等结论。更多还原

【Abstract】 Based on the digital seismic waveform data of the Shanxi Digital Telemetric Seismograph Network,anomaly characteristics of seismic wave parameters,including sign and half-period of first motion of P wave,amplitude ratio,attenuation rate of S wave and duration time ratio of coda wave,before and after the Hongtong,Shanxi,earthquake are studied.It is concluded that consistency of the signs of first motion of P wave for small earthquakes increases,and that half-period of first motion has the time sequence evolvement process of low value-fluctuation-earthquake occurrence or low value-earthquake occurrence before the Hongtong earthquake.更多还原