东日本9.0级大地震激发的地球自由振荡时频分析  

The Time Frequency Analysis of the Earth's Free Oscillation Induced by the M9.0Earthquake in East Japan Observed with the DZW Gravimeter

作　　者：金大利[1] 李瑞东[2] 樊春艳[3] 李金[4] 王妍[4] 符泽宇 赵建明[4] 任佳[4] 

机构地区：[1]天津市地震局,天津市耐火路7号300201 [2]防灾科技学院,三河市燕郊学院街065201 [3]中国地震台网中心,北京市南横街5号100045 [4]河北省地震局唐山中心台,唐山市063000

出　　处：《大地测量与地球动力学》2015年第3期529-532,共4页Journal of Geodesy and Geodynamics

基　　金：中国地震局教师科研基金(20120122)

摘　　要：利用中国14个台站的DZW型重力仪观测资料,对东日本9.0级大地震激发的地球自由振荡进行时频分析,展示其二维及三维时频分布特征。对比14个台站的谱图发现,地球自由振荡能量在频率轴的展布很均匀,均可清晰展示频率信息;而在时间轴上存在一些差异,大部分台站展布相近,宜昌台、西昌小庙台、厦门台和深圳台4个台站的展布相对较窄。We analyze the earth＇s free oscillation induced by the M9.0 earthquake off the east coast of Japan, using data observed with the DZW gravimeter at China＇s 14 observatory stations, and the 2D and 3D time frequency characteristics are displayed for the first time. Comparing the spectrum figures of the 14 observatory stations, we found that the energy of the earth free oscillation is uniformly dis- tributed in the frequency axis, and shows frequency information clearly. However, there are differ- ences in the time axis, the distribution of the energy of the earth free oscillation is similar at most sta- tions, but narrower at the Yichang, Xichangxiaomiao, Xiamen and Shenzhen stations.

关 键 词：DZW型重力仪 地球自由振荡 时频分析 东日本9.0级地震 

分 类 号：P315[天文地球—地震学]