山西洪洞M_L5.0地震前后地震波参数的异常特征
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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。
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.
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.
引文
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[3]陈运泰,吴忠良,王培德,等.数字地震学[M].北京:地震出版社,2000:52-53.
[4]王莜荣.利用地震波参数进行地震预报的新探索[J].高原地震,1999,11(3):49-57.
[5]曲延军,王海涛,胡才荣,等.中等地震前地震波异常特征[J].高原地震,1993,5(1):9-16.
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