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利用张家口地震台体应变观测资料检测地球自由振荡
引用本文:李金,符泽宇,刘燕翔,王妍,宫猛,赵建明,任佳.利用张家口地震台体应变观测资料检测地球自由振荡[J].地震地磁观测与研究,2019,40(3):93-99.
作者姓名:李金  符泽宇  刘燕翔  王妍  宫猛  赵建明  任佳
作者单位:中国河北 063000 唐山地震中心台;中国石家庄 050021 河北省地震局
基金项目:中国地震局地震科技星火计划项目(项目编号:XH18008Y);中国地震局三结合课题(项目编号:160304);河北省地震局地震科技星火计划(项目编号:DZ20170512076)
摘    要:在保证低频自由振荡信号分辨率,又不对高频自由振荡信号产生抑制效应的前提下,利用张家口地震台体应变观测资料,采用功率谱密度估计方法,获得2011年3月11日日本9.0级大地震激发的0S2-0S74基频球型振荡和17个谐频球型振荡(3S25S32S102S123S911S17S105S134S185S1414S44S241S387S1814S89S195S30),并与地球初步参考模型(PREM)的理论自由振荡周期进行对比,发现与实测振荡周期基本一致。

关 键 词:地球自由振荡  功率谱密度  PREM模型  体应变

Detection of Earth's free oscillations by using body strain observation data at Zhangjiakou Seismic Statoin
Li Jin,Fu Zeyu,Liu Yanxiang,Wang Yan,Gong Meng,Zhao Jianming,Ren Jia.Detection of Earth's free oscillations by using body strain observation data at Zhangjiakou Seismic Statoin[J].Seismological and Geomagnetic Observation and Research,2019,40(3):93-99.
Authors:Li Jin  Fu Zeyu  Liu Yanxiang  Wang Yan  Gong Meng  Zhao Jianming  Ren Jia
Institution:1.Thangshan Central Seismic Station, Hebei Province 063000, China;2.Hebei Earthquake Agency, Shijiazhuang 050021, China
Abstract:Under the conditions of ensuring the resolution ratio of low frequency free oscillation signals and no inhibiting effect on high frequency free oscillation signals, we acquired 0S2-0S74 fundamental sphere free oscillations and 17 harmonic sphere free oscillations 3S25S32S102S123S911S17S105S134S185S1414S44S241S387S1814S89S195S30 caused by the March 11,2011 Japan earthquake using the digital observation data of the strain meter at Zhangjiakou Seismic Station by power spectrum density estimation method. Compared it with the periods of free oscillations of the PREM model, it is found that the measured oscillation period is basically coincide with the oscillation period predicted by the PREM model.
Keywords:the earth free oscillation  power spectral density  preliminary reference earth model(PREM)  body strain
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