【摘要】 选取四川省姑咱台和攀枝花南山台SSY石英伸缩仪观测资料,对2004年12月26日印尼苏门答腊Ms8.7地震、2003年9月26日日本北海道Ms8.0地震和2003年9月27日俄、蒙、中交界Ms7.9地震激发的振荡波列进行小波分解及谱分析,并与日常观测记录的分析结果比较。结果显示SSY石英伸缩仪记录资料给出的巨大远震激发的振荡波时间滞后,振荡波列的小波分解得到的谱结构的主要几种频率成分,与地球自由振荡的某些振型是一致的。更多还原

【Abstract】 On the basis of the observations of SSY quartz extensometers at Guza and Panzhihua-Nanshan stations in Sichuan province,the oscillation wave trains excited by the Sumatra Ms8.7 earthquake on December 26,2004 in Indonesia,the Hokkaido Ms8.0 earthquake on September 26,2003 in Japan and the Ms7.9 earthquake on September 27,2003 on the borders of Russia,Mongolia and China were decomposed by wavelet transform and the spectrum analysis were done,and the analysis results were compared with the usual observation records.The time of oscillation waves excited by great far-field earthquake from SSY quartz extensometer observation data lags,several main frequency components of spectrum structure obtained by decomposing oscillation wave trains are in accordance with some modes of earth’s free oscillations.更多还原