利用沈家地震台水位资料检测地球自由振荡  

DETECTION OF EARTH’S FREE OSCILLATIONS BY USING WATER LEVEL-METER AT SHENJIA SEISMIC STATOIN

作　　者：李金[1] 宫猛[2] 刘燕翔[1] 王妍[1] 符泽宇 任佳[3] LI Jin;GONG Meng;LIU Yanxiang;WANG Yan;FU Zeyu;REN Jia(Tangshan Central Seismic Station,Hebei Earthquake Agency,Tangshan 063000,China;Hebei Earthquake Agency,Shijiazhuang 050021,China;Hongshan Standard Seismic Station,Hebei Earthquake Agency, Xingtai 054000,China)

机构地区：[1]河北省地震局唐山中心地震台,河北唐山063000 [2]河北省地震局,河北石家庄0500212 [3]河北省地震局红山基准地震台,河北邢台054000

出　　处：《高原地震》2019年第3期23-29,33,共8页Plateau Earthquake Research

基　　金：中国地震局地震科技星火计划项目(项目编号:XH18008Y);中国地震局监测、预报、科研三结合课题(课题编号:160304);河北省地震科技星火计划之青年项目(项目编号:DZ20180322027)联合资助

摘　　要：利用沈家台LN-3A型数字化水位仪观测资料,采用功率谱密度估计的方法,检测到了2011年3月11日日本Mw9.0级大地震激发的0S2~0S76基频球型自由振荡和5个谐频球型自由振荡1S3、1S6、2S12、7S10、1S38,并与地球初步参考模型(PREM)的理论自由振荡频率进行比较,结果表明,实际观测振荡频率与PREM模型预测的振荡频率基本吻合。Using digital observation data of LN-3A water level-meter at Shenjia seismic station and with power spectrum density estimation method,the authors detected 0 S 2 ~ 0 S 76 fundamental sphere free oscillations and 1 S 3 、 1 S 6 、 2 S 12 、 7 S 10 、 1 S 38 five harmonic frequency free oscillations caused by the M w9.0 earthquake on March 11,2011 in Japan,and then compared it with the frequency of free oscillations of the PREM model. The results show that the observed oscillation frequencies are consistent with those predicted by the PREM model.

关 键 词：水位仪 地球自由振荡 功率谱密度 PREM模型 

分 类 号：P315.4[天文地球—地震学]