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Gravity Variations and Ground Deformations Resulting from Core Dynamics.

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Fluid motion in Earth's core causes gravity variations and ground deformations. However, these core-induced signals are about ten times smaller than surface processes, making them challenging to detect and isolate.

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Area of Science:

  • Geophysics
  • Earth Science
  • Core Dynamics

Background:

  • Fluid motion in Earth's liquid outer core redistributes mass, deforming solid boundaries and altering rotation.
  • These internal mass changes and rotational variations induce global gravity changes and ground deformations.

Purpose of the Study:

  • To review the mechanisms of core-induced gravity variations and ground deformations.
  • To discuss methods for reconstructing and estimating the amplitudes of these core signals.
  • To compare the magnitude of core-generated signals with those from surface processes.

Main Methods:

  • Review of existing literature on Earth's core dynamics.
  • Analysis of mass redistribution and deformation processes within the core.
  • Comparison of core-generated signals with surface-driven signals using spherical harmonic analysis.

Main Results:

  • Core processes contribute to gravity variations and ground deformations through mass advection, boundary deformation, and torques on the inner core.
  • At spherical harmonic degree 2, core contributions are approximately ten times smaller than those from surface processes.
  • The contribution from the core diminishes with increasing harmonic degree.

Conclusions:

  • Core dynamics significantly influence global gravity and deformation, but their signals are subtle.
  • Extracting core-generated signals requires precise removal of larger signals from surface processes.
  • Current understanding suggests core signals are a minor component of observed gravity and deformation variations.