Advances in Earth Science ›› 2002, Vol. 17 ›› Issue (5): 664-669. doi: 10.11867/j.issn.1001-8166.2002.05.0664

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ADVANCES IN THE STUDY ON THE EFFECTS OF THE EARTH'S FLUID OUTER CORE

XU Jian-qiao, SUN He-ping   

  1. Key Laboratory of Dynamic Geodesy, Institute of Geodesy and Geophysics, CAS, Wuhan 430077,China
  • Received:2001-11-29 Revised:2002-03-22 Online:2002-12-20 Published:2002-10-01

XU Jian-qiao, SUN He-ping. ADVANCES IN THE STUDY ON THE EFFECTS OF THE EARTH'S FLUID OUTER CORE[J]. Advances in Earth Science, 2002, 17(5): 664-669.

The techniques to study the global geodynamics of the Earth's fluid outer core, the advances in the detection of its dynamical effects and some results are briefly reviewed. The roles of the superconducting gravimeters on the study on the fluid core dynamics are specially emphasized on. Based on the preliminary reference Earth's model, the elasto-gravitational deformation theory of a spherical, non-rotating, perfectly elastic and isotropic (SNREI) Earth is employed to study the deformation of the Earth's solid parts (including the mantle and the solid inner core) caused by the perturbation on the core-mantle and inner core boundaries due to the dynamical effects of the fluid outer core. According to the nearly diurnal resonance on the tidal gravity observations, the Earth's free core nutation is investigated by stacking the gravity data recorded with international six super- conducting gravimeters. The corresponding resonance parameters are accurately determined as 429.0 (424.3, 433.7) sidereal days for the egeinperiod, 9 543 (6 405, 18 714) for the quality factors, and (-6.10±0.20, -0.01±0.02) ×10-4 °/h for the complex resonance strength. Recently, the product spectral density of 21 long-term and high-quality gravity data sequences, obtained with 14 superconducting gravimeters globally distributed at the Global Geodynamics Project observatory network, are estimated in order to search for the translational oscillations of the solid inner core.

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