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利用伸缩仪观测资料检测日本9.0级大地震激发的地球自由振荡

Detection of The Earth’s Free Oscillation Excited by the Japan M9.0 Earthquake by Using Observation Data of Extensometer

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【Author】 CHENG Na1,ZHAI Jian2,LI Xi-shun3,WEN Chao4,NING Hai-wen5,REN Jia5(1.Luoyang Seismological Station of Earthquake Administration of Henan Province,Luoyang,Henan 471000,China; 2.Luoyang Seismological Station of Earthquake Administration of Henan Province,Luoyang,Henan 471000,China; 3.Hongshan Reference Seismological Station of Earthquake Administration of Hebei Province,Longyao,Hebei 055300,China; 4.Earthquake Administration of Hebei Province,Shijiazhuang,Hebei 050021,China; 5.Zhangjiakou Central Seismological Station of Hebei Province,Zhangjiakou,Hebei 075000,China)

【机构】河南省地震局洛阳地震台；河北省地震局红山基准台；河北省地震局；河北省地震局张家口中心台；

【摘要】利用河南信阳台和河北张家口台伸缩仪的数字化观测资料,采用功率谱密度估计方法,在没有对资料进行去固体潮处理的情况下,准确获得了2011年3月11日日本9.0级大地震激发的0S4～0S39基频球型自由振荡,并与地球初步参考模型(PREM)的理论自由振荡频率进行了对比,发现实测振荡频率与PREM预测的振荡频率基本符合。更多还原

【Abstract】 Based on the digital observation data of extensometer of Xinyang,Henan,Seismological Station and Zhangjiakou,Hebei,Seismological Station,the spheroidal free oscillation of 0S4~0S39 basic frequency excited by the MAR.11,2011 Japan earthquake of M9.0 is accurately gained by using power spectral density estimation,in the condition without eliminating solid tide of the data.The result is contrasted with the theoretical free oscillation frequency of PREM,found that the measured oscillation frequency mainly coincides with the oscillation frequency predicted by PREM.更多还原

【关键词】地球自由振荡；伸缩仪；日本9.0级大地震；球型振荡；
【Key words】 free oscillation of Earth； Extensometer； Japan M9.0 great earthquake； spheroidal oscillation；

【文献出处】山西地震 ,Earthquake Research in Shanxi , 编辑部邮箱 ,2011年03期

【分类号】P315.63
【被引频次】2
【下载频次】40

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