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利用云南省数字化水管仪的观测资料,采用功率谱密度估计方法,在没有对资料进行去固体潮处理的情况下,准确获得了2004年12月26日苏门答腊大地震激发的0S4～0S30基频球型自由振荡,并与前人的观测结果进行比较,同时对照了PREM模型的理论计算周期,发现水管仪观测与这三者符合得非常好,除0S4振型的观测周期和周期1、周期2、周期3的相对误差均大于0.3%外,其余的差别在3‰以下。研究表明,利用数字化水管仪观测资料的确可以提取到苏门答腊大地震激发的地球球型振荡,这就为地球自由振荡的研究提供了一种新的观测手段。
Based on the observation data of Yunnan digital aquifer and the power spectrum density estimation method, the data of 0S4 ~ 0S30 fundamental frequency excited by the Sumatra earthquake on December 26, 2004 were obtained accurately without the data of desilting. Type free oscillations and compared with the previous observations. At the same time, the theoretical calculation cycle of the PREM model was compared and found that the observer of the water pipe was in good agreement with the three observations except that the observed periods and periods 1 and 2 of 0S4 mode , The relative error of cycle 3 is greater than 0.3%, the remaining difference is below 3 ‰. The research shows that using the digital aquifer observation data can indeed extract the Earth’s spherical oscillation induced by the Sumatra earthquake, which provides a new observation method for the study of the Earth’s free oscillation.