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Detection of the translational oscillations of the Earth's solid inner core based on the international superconducting gravimeter observations

机译：基于国际超导重力仪的观测，检测地球固体内核的平移振荡

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Based on the 21 series of the high precision tidal gravity observations recorded using superconducting gravimeters (SG) at 14 stations distributed globally (in totally about 86 years), the translational oscillations of the Earth's solid inner core (ESIC) is detected in this paper. AH observations are divided into two groups with G-I group (8 relatively longer observational series) and G-II group (13 relatively shorter observational series). The detailed corrections to minute original observations for each station are carried out, the error data due to the earthquakes, power supply impulses and some perturbations as change in atmospheric pressure and so on are carefully deleted for the first step, the gravity residuals are obtained after removing further synthetic tidal gravity signals. The Fast Fourier Transform analysis is carried out for each residual series, the estimations of the product spectral densities in the sub-tidal band are obtained by using a multi-station staking technique. The 8 common peaks are found after further removing the remaining frequency dependent pressure signals. The eigenperiods, quality factors and resonant strengths for these peaks are simulated. The numerical results show that the discrepancies of the eigenperiods for 3 of 8 peaks, compared to those of theoretical computation given by Smith, are only 0.4 percent, -0.4 percent and 1.0 percent. This coincidence signifies that the dynamical phenomenon of the Earth's solid inner core can be detected by using high precision ground gravity observations. The reliability of the numerical computation is also checked, the spectral peak splitting phenomenon induced by Earth's rotation and ellipticity is preliminary discussed in this paper.
机译：基于超导重力仪（SG）在全球分布的14个站（共计约86年）记录的21个高精度潮汐重力观测值，本文检测到了地球固体内芯（ESIC）的平移振荡。 AH观测分为G-I组（8个相对较长的观测序列）和G-II组（13个相对较短的观测序列）两组。对每个站点的微小原始观测值进行了详细的校正，第一步，由于地震，电源脉冲和大气压变化等引起的微扰等引起的误差数据被认真删除，重力残差在获得之后消除其他合成潮汐重力信号。对每个残差序列进行快速傅立叶变换分析，通过使用多站桩技术来获得潮下带乘积谱密度的估计值。在进一步去除剩余的频率相关压力信号后，找到8个共同峰。模拟这些峰的本征周期，品质因数和共振强度。数值结果表明，与Smith给出的理论计算相比，8个峰中的3个峰的本征周期差异仅为0.4％，-0.4％和1.0％。这种巧合表明，可以通过使用高精度地面重力观测来检测地球固体内核的动力学现象。本文还对数值计算的可靠性进行了检验，初步讨论了地球自转和椭圆率引起的谱峰分裂现象。

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