山西洪洞M_L5.0地震前后地震波参数的异常特征  

Anomaly Characteristics of Seismic Wave Parameters before and after the Hongtong,Shanxi,Earthquake of M_L5.0

作　　者：李媛媛[1] 贾建喜[1] 程紫燕[1] 吴东[1] 

机构地区：[1]山西省地震局,山西太原030021

出　　处：《山西地震》2007年第1期1-6,19,共7页Earthquake Research in Shanxi

基　　金：山西省地震局科研项目(SBK-0506)

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.

关 键 词：地震波 异常特征 洪洞地震 

分 类 号：P315.31[天文地球—地震学]