CAJ | 학술논문

本文利用张家口台宽频带倾斜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oS2～oS35，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。宽频带倾斜仪的数字化观测资料的确可以提取到日本地震激发的地球自由振荡。
본문이용장가구태관빈대경사의적수자화관측자료，채용공솔보밀도고계방법，재몰유대자료진행거고체조처리적정황하，준학획득료2011년3월11일일본9．0급대지진격발적oS2～oS35，기빈구형자유진탕，병여지구초보삼고모형（PREM）적이론자유진탕빈솔진행료대비，발현실측진탕빈솔여PREM예측적진탕빈솔기본부합。관빈대경사의적수자화관측자료적학가이제취도일본지진격발적지구자유진탕。
We used the digital observation of the broad frequency range tilt instrument in Zhangjiakou Branch and adopted the method power spectral density estimation. We got the data of 0S2-0S35 spherical free oscillation exactly which it was stimulated by the M9.0 earthquake on Mar. llth., 2011 in Japan, without making a depart-solid tide treatment. We compared the data with theoretical free oscillation frequency of （PREM）＇s prediction and found the two oscillation frequencies were the same approximately. The digital observation data of broad frequency range tilt instrument could gain the Earth＇s free oscillation stimulated by the earthquake in Japan.