东日本9.0级大地震激发的地球自由振荡时频分析
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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 M9.0earthquake off the east coast of Japan,using data observed with the DZW gravimeter at China's 14 observatory stations,and the 2D and 3Dtime 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 distributed in the frequency axis,and shows frequency information clearly.However,there are differences in the time axis,the distribution of the energy of the earth free oscillation is similar at most stations,but narrower at the Yichang,Xichangxiaomiao,Xiamen and Shenzhen stations.
引文
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