Normal modes of rotating Earth models
type: Dataset
description: The normal-mode spectrum of rotating Earth models is made up of the seismic modes, the rotational modes and the spectrum of the liquid core. The local equations for the infinitesimal elastic-gravitational deformation, based on a Lagrangian perturbation of a spherically-averaged Earth model using the theory of hydrostatic equilibrium, are first established. A comparison is made between this approach and the classical global angular momentum approach to Earth rotation variations. The splitting of the seismic modes by rotation and ellipticity is then computed. Numerical investigation also shows that, by changing the structure of the liquid core, the rotational modes and core spectrum interact to give rise to avoided crossings, which provide a physically plausible mechanism to explain the observed double frequency of the Chandler wobble. The analogy with other oscillatory physical systems allows for a better understanding of the avoided crossing phenomenon.
issued: 2026-05-15T08:52:46.393750
language: en
modified: 2026-05-15T08:52:46.393756
contact point: Organization
  fn: CCSD
keyword: earth-rotation
keyword: fluid-core-dynamics
keyword: geodesy
keyword: geophysics
keyword: habilitation-a-diriger-des-recherches
keyword: infoeu-reposemanticsother
keyword: normal-modes
keyword: physphysphys-geo-phphysics-physicsphysics-physicsgeophysics-physicsgeo-ph
keyword: sdemcgenvironmental-sciencesglobal-changes
keyword: sdustugpsciences-of-the-universe-physicsearth-sciencesgeophysics-physicsgeo-ph
keyword: seismology
landing page: https://theses.hal.science/tel-00773648

Normal modes of rotating Earth models
type: Distribution
format: HTML
issued: 2026-05-15T08:52:46.401699
modified: 2026-05-15T08:52:46.370335
access URL: https://theses.hal.science/tel-00773648

test_moissonnage_selune
type: Agent