Recent Advances in Applications of Geodetic VLBI to Geophysics

This paper presents recent advances in Earth Orientation Parameters (EOP) determination and in their modeling. These advances are related to the increase of the precision of the observation and the implementation of dedicated strategies to better obtain them. The advances are also related to the determination of Earth geophysical parameters from VLBI observations and better modeling of the phenomena within the Earth. Further improvement in the observation precision enhances our understanding of the interior of the Earth. In particular, we examine the coupling mechanisms at the core-mantle boundary: the electromagnetic coupling, the topographic coupling, and the viscous coupling. We also present future developments necessary for a better understanding of the Earth’s interior and its orientation parameters.

[1]  O. Anderson,et al.  Electrical and thermal conductivities of Fe–Ni–Si alloy under core conditions , 2001 .

[2]  John M. Wahr,et al.  The forced nutations of an elliptical, rotating, elastic and oceanless earth , 1981 .

[3]  U. Christensen,et al.  Scaling properties of convection-driven dynamos in rotating spherical shells and application to planetary magnetic fields , 2006 .

[4]  U. Christensen,et al.  Magnetic and viscous coupling at the core—mantle boundary: inferences from observations of the Earth's nutations , 2007 .

[5]  J. Tromp,et al.  Even‐degree lateral variations in the Earth's mantle constrained by free oscillations and the free‐air gravity anomaly , 2001 .

[6]  Thomas A. Herring,et al.  Modeling of nutation and precession: New nutation series for nonrigid Earth and insights into the Ea , 2002 .

[7]  G. Soldati,et al.  Tomography of core–mantle boundary and lowermost mantle coupled by geodynamics , 2012 .

[8]  V. Dehant,et al.  Recent advances in modeling precession-nutation , 2008 .

[9]  A. Dziewoński,et al.  Joint inversions of seismic and geodynamic data for models of three—dimensional mantle heterogeneity , 1994 .

[10]  P. M. Mathews,et al.  Forced nutations of the Earth: Influence of inner core dynamics: 2. Numerical results and comparisons , 1991 .

[11]  N. Simmons,et al.  Joint seismic, geodynamic and mineral physical constraints on three-dimensional mantle heterogeneity: Implications for the relative importance of thermal versus compositional heterogeneity , 2009 .

[12]  UK,et al.  Structure and dynamics of liquid iron under Earth’s core conditions , 2000 .

[13]  V. Dehant,et al.  Analytical computation of the effects of the core-mantle boundary topography on tidal length-of-day variations , 2012 .

[14]  A. Dziewoński,et al.  Whole Earth tomography from delay times of P, PcP, and PKP phases: Lateral heterogeneities in the outer core or radial anisotropy in the mantle? , 2000 .

[15]  Patrick Charlot,et al.  The International Celestial Reference Frame as Realized by Very Long Baseline Interferometry , 1998 .

[16]  P. M. Mathews,et al.  Forced nutations of the earth: Influence of inner core dynamics. I - Theory. II - Numerical results and comparisons. III - Very long interferometry data analysis , 1991 .

[17]  V. Dehant Integration of the gravitational motion equations for an elliptical uniformly rotating earth with an inelastic mantle , 1987 .

[18]  Gino Tuccari,et al.  VLBI2010: A Vision for Future Geodetic VLBI , 2007 .

[19]  J. Wahr,et al.  Effects of non‐hydrostatic core‐mantle boundary topography and core dynamics on Earth rotation , 1997 .

[20]  Thomas A. Herring,et al.  Geodesy by radio interferometry: Studies of the forced nutations of the earth. I - Data analysis. II - Interpretation , 1986 .

[21]  Thomas A. Herring,et al.  Geodesy by radio interferometry: Studies of the forced nutations of the Earth. II: Interpretation , 1986 .

[22]  Thomas A. Herring,et al.  Modeling of nutation and precession: Effects of electromagnetic coupling , 2002 .

[23]  Viscomagnetic torque at the core mantle boundary , 2005, physics/0503038.

[24]  S. Lambert Atmospheric excitation of the Earth's free core nutation , 2006 .

[25]  J. Wahr,et al.  Internal Loading of an Inhomogeneous Compressible Earth With Phase Boundaries , 1996 .

[26]  S. Sutton,et al.  Towards evaluating the viscosity of the Earth's outer core: An experimental high pressure study of liquid Fe‐S (8.5 wt.% S) , 2002 .

[27]  Thomas A. Herring,et al.  Forced nutations of the Earth: Influence of inner core dynamics: 1. Theory , 1991 .

[28]  E. F. Arias,et al.  THE SECOND REALIZATION OF THE INTERNATIONAL CELESTIAL REFERENCE FRAME BY VERY LONG BASELINE INTERFEROMETRY , 2015 .

[29]  Alexandre Fournier,et al.  Fast torsional waves and strong magnetic field within the Earth’s core , 2010, Nature.

[30]  L. Koot,et al.  Viscosity of the Earth's inner core: Constraints from nutation observations , 2011 .

[31]  B. Buffett Chemical stratification at the top of Earth's core: Constraints from observations of nutations , 2010 .

[32]  B. Buffett Tidal dissipation and the strength of the Earth’s internal magnetic field , 2010, Nature.

[33]  V. Dehant,et al.  Constraints on the coupling at the core-mantle and inner core boundaries inferred from nutation observations , 2010 .

[34]  O. de Viron,et al.  Atmospheric contributions to nutations and implications for the estimation of deep Earth's properties from nutation observations , 2011 .

[35]  P. Mathews,et al.  Impact of inner core rotation on outer core flow: the role of outer core viscosity , 2004 .

[36]  Z. Altamimi,et al.  ITRF2008: an improved solution of the international terrestrial reference frame , 2011 .

[37]  P. Mathews,et al.  Viscoelectromagnetic coupling in precession‐nutation theory , 2005 .