张北地震余震Lg尾波Q的初步研究  

THE PRELIMINARY STUDY OF LG CODA Q FOR THE AFTERSHOCKS OF THE ZHANGBEI EARTHQUAKE

作　　者：阎晓蔚[1] 刘建华[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100101

出　　处：《地球物理学进展》2001年第1期93-100,共8页Progress in Geophysics

基　　金：国家高技术研究发展计划 863项目 !(82 0 0 1 0 4 )

摘　　要：利用两台架设在北京台的海底地震仪样机记的 1 998年 1月 1 0日 6 .2M张北地震的余震 ,选其中信噪比较高的记录利用单台叠加频谱比法得到Lg尾波Q及频率依赖因子 .结果显示 ,所有地震的Lg尾波Q值都比较接近 ,并且由两台仪器记录的同一地震得到的Q值及具有较高的一致性 .从中可以得出两点结论 :(1 )单台叠加频谱比法是求Q值的较稳定的方法 ,(2 )两台仪器的性能比较稳定 。In this paper, from several Lg coda time series of aftershocks of Zhangbei principal earthquake (M 1=6.2) on January 10,1998, which were recorded by two test digital ocean bottom seismograghs, we choose high signal to noise ratio records to obtain the Lg coda Q and frequency dependence η with stacked spectral ratio method. Because the two seismograghs were laid on the same seismic station (in Baijiatuan, Beijing), all the aftershocks have almost the same ray trace to get to them. The results show that all the Lg coda Q of the aftershocks are similar, furthermore, the Lg coda Q obtained by the same earthquake respectively recorded by the two seismograghs are insistent with each other. And then, the results are summarized as following: 1. SSR method is one of the good choice methods for crustal Q measurement. 2. The two seimograghs are stable and reliable.

关 键 词：余震 尾波Q 张北地震 频率依赖性 地震仪 

分 类 号：P315.4[天文地球—地震学]