Constraints on Transient Viscoelastic Rheology of the Asthenosphere From Seasonal Deformation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2018

Constraints on Transient Viscoelastic Rheology of the Asthenosphere From Seasonal Deformation

Kristel Chanard
Luce Fleitout
Eric Calais
  • Fonction : Auteur
  • PersonId : 838291
Jean-Philippe Avouac

Résumé

We discuss the constraints on short-term asthenospheric viscosity provided by seasonal deformation of the Earth. We use data from 195 globally distributed continuous Global Navigation Satellite System stations. Surface loading is derived from the Gravity Recovery and Climate Experiment and used as an input to predict geodetic displacements. We compute Green's functions for surface displacements for a purely elastic spherical reference Earth model and for viscoelastic Earth models. We show that a range of transient viscoelastic rheologies derived to explain the early phase of postseismic deformation may induce a detectable effect on the phase and amplitude of horizontal displacements induced by seasonal loading at long wavelengths (1,300-4,000 km). By comparing predicted and observed seasonal horizontal motion, we conclude that transient asthenospheric viscosity cannot be lower than 5 × 10 17 Pa.s, suggesting that low values of transient asthenospheric viscosities reported in some postseismic studies cannot hold for the seasonal deformation global average.
Fichier principal
Vignette du fichier
chanard_et_al-2018-geophysi.pdf (6.58 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02325469 , version 1 (22-10-2019)

Identifiants

Citer

Kristel Chanard, Luce Fleitout, Eric Calais, Sylvain Barbot, Jean-Philippe Avouac. Constraints on Transient Viscoelastic Rheology of the Asthenosphere From Seasonal Deformation. Geophysical Research Letters, 2018, 45 (5), pp.2328-2338. ⟨10.1002/2017GL076451⟩. ⟨hal-02325469⟩
17 Consultations
117 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More