Infrasound modeling in a spherical heterogeneous atmosphere - INSU - Institut national des sciences de l'Univers Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2005

Infrasound modeling in a spherical heterogeneous atmosphere

Résumé

The deployment of a worldwide network for infrasound detection requires numerical methods for modeling these signals over long distances. A ray theoretical approach appears robust and efficient. It furthermore allows a straightforward interpretation of recorded phases. We have developed a three-dimensional Hamiltonian ray tracing for modeling linear acoustic waves in the atmosphere. Propagating over distances superior to 500 km requires the curvature of the Earth to be considered, which is achieved by using spherical coordinates. High atmospheric winds are properly handled through a modified Hamiltonian. These winds as well as sound velocity can change significantly during long-lasting propagations; these variations are also included in our modeling. Finally, the amplitude of infrasonic signals is computed by concomitantly solving for paraxial rays and assessing the evolution of the ray tube thus defined. We present the theory for this atmospheric infrasound modeling and some simple applications that establish its robustness and potential.
Fichier principal
Vignette du fichier
2005GL022867.pdf (565.72 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

insu-00355221 , version 1 (19-02-2021)

Identifiants

Citer

J.-X. Dessa, J. Virieux, S. Lambotte. Infrasound modeling in a spherical heterogeneous atmosphere. Geophysical Research Letters, 2005, 32, pp.L12808. ⟨10.1029/2005GL022867⟩. ⟨insu-00355221⟩
78 Consultations
67 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More