摘要
An attempt has been made to search for the translational oscillations of the Earth＇s solid inner core in the gravity measurements recorded with the superconducting gravimeters （SG） from the worldwide network of the Global Geodynamics Project （GGP）. All the SG data were prepared and analyzed by the same method to remove accurately the signatures related to gravity tides, local baro- metric pressure, the Earth＇s rotation, the long-term trend and so on. We obtained the estimations of the power spectral densities of each residual series and the estimations of the product spectral densities in the subtidal band （0.162-0.285 cph） were obtained by using a multi-station stacking technique after further eliminating atmospheric effects. The inner core translation triplet was detected in the subtidal band. We find 6 groups of signal with high signal-to-noise ratio that are consistent with the characteris- tics of the triplet, and 4 groups of the results that are close to the previous studies and the differences are less than 0.92%. It implies that the groups of signatures all have the possibility to be related to the inner core translational oscillations.
An attempt has been made to search for the translational oscillations of the Earth＇s solid inner core in the gravity measurements recorded with the superconducting gravimeters （SG） from the worldwide network of the Global Geodynamics Project （GGP）. All the SG data were prepared and analyzed by the same method to remove accurately the signatures related to gravity tides, local baro- metric pressure, the Earth＇s rotation, the long-term trend and so on. We obtained the estimations of the power spectral densities of each residual series and the estimations of the product spectral densities in the subtidal band （0.162-0.285 cph） were obtained by using a multi-station stacking technique after further eliminating atmospheric effects. The inner core translation triplet was detected in the subtidal band. We find 6 groups of signal with high signal-to-noise ratio that are consistent with the characteris- tics of the triplet, and 4 groups of the results that are close to the previous studies and the differences are less than 0.92%. It implies that the groups of signatures all have the possibility to be related to the inner core translational oscillations.
基金
supported by the National Natural Science Foundation of China(Nos.41021003 and 41074053)
