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利用怀来地震台水管仪观测资料检测地球自由振荡
Detecting the Earth’s free oscillations in the usage of observed data of water-pipe instrument in Huailai Seismic Station
【摘要】 利用怀来地震台水管仪的数字化观测资料,采用功率谱密度估计方法,在没有对资料去固体潮处理的情况下,准确获得2004年12月26日苏门答腊9.0级地震激发的0S2—0S38基频球型自由振荡,并与PREM模型的理论自由振荡周期进行对比,发现实测振荡周期与PREM预测的振荡周期吻合,除0S2、0S4、0S7振型的观测周期和PREM模型理论周期的相对误差大于0.3%外,其他振型的观测周期和PREM模型理论周期的相对误差大都集中在0.1%左右,同时检测到7个谐频球型振荡和10个环型振荡。可以从水管倾斜仪的观测资料中提取地球球型振荡信息,为地球自由振荡的研究提供一种新的仪器观测方法。
【Abstract】 In this research,without dealing with the case of solid tide,we successfully detected 0S2— 0S38 free ball-oscillation excited by Sumatra earthquake on December 26,2004 in the use of observational data of the digital water-pipe meter in Huailai Seismic Station,with power spectral density estimation methods.Comparing with the free-running period of PREM model theory,we found that,except for the relative value between the period of 0S2、0S4、0S7 and the PREM prediction is greater than 0.3%,the value regarding the vibration mode of the observation period and the PREM model were mainly focused on the relative error of about 0.1%.Also,we detected seven harmonic oscillation and 10 ring oscillation.In the use of observed data from water-pipe instrument to extract information of Earth oscillation,provide a new instrument method of observation for the study of the Earth’s free oscillations.
【Key words】 water-pipe instrument; Sumatra M 9. 0 earthquake; the Earth s free oscillations; the ball-oscillation;
- 【文献出处】 地震地磁观测与研究 ,Seismological and Geomagnetic Observation and Research , 编辑部邮箱 ,2010年05期
- 【分类号】P315.7
- 【被引频次】1
- 【下载频次】10