How to Detect Water in the Mantle Wedge of a Subduction Zone Using Seismic Anisotropy - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2018

How to Detect Water in the Mantle Wedge of a Subduction Zone Using Seismic Anisotropy

D. A. Okaya
  • Fonction : Auteur

Résumé

In approximately one fourth of worldwide subduction zones, seismic observations indicate a rotation from trench-normal to trench-parallel fast axis orientations in the mantle wedge. To interpret this observation we predict the evolution of crystal lattice preferred orientation in mantle wedge material as a function of the amount of water by using a model of polycrystal deformation (D-Rex) coupled with an analytical corner flow. The resulting seismic signature is obtained from synthetic seismic wave propagation through this mantle wedge. We identify that progressive hydration produces the rotation of fast axis orientations and can generate between the two zones of trench-parallel and trench-normal fast axis orientations a morph zone with very small anisotropy and a related decrease in P and S wave velocities. Such a morph zone is not produced by trench-parallel flow, hence this signature can be used to detect water in the mantle wedge.
Fichier principal
Vignette du fichier
Geophysical Research Letters - 2018 - Kaminski - How to Detect Water in the Mantle Wedge of a Subduction Zone Using Seismic.pdf (3.41 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

insu-03589304 , version 1 (25-02-2022)

Licence

Copyright (Tous droits réservés)

Identifiants

Citer

E. Kaminski, D. A. Okaya. How to Detect Water in the Mantle Wedge of a Subduction Zone Using Seismic Anisotropy. Geophysical Research Letters, 2018, 45, pp.13,298-13,305. ⟨10.1029/2018GL079571⟩. ⟨insu-03589304⟩
46 Consultations
16 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More