Earth-Atmosphere system modeling for acoustic and gravity wave propagation
Abstract
Acoustic and gravity waves generated, for example, by seismic surface waves or explosions in the atmosphere could lead to a significant step into the understanding of the atmosphere dynamics but also of the interior structure of planets. Thus an accurate numerical modeling of the solid-fluid coupling and the atmosphere dynamics is thus important to properly understand the coupled solid-fluid system. We therefore introduce a numerical modeling tool that takes into account the propagation of both acoustic and gravity waves in a non-linear atmosphere (Navier-stokes equations) coupled to a linear viscoelastic solid Earth. The implementation is performed based on both discontinuous and continuous Galerkin methods and implemented in the SPECFEM 2D software package. Validation cases are presented by comparison with analytical solutions and with linear wave propagation simulated based on a finite difference technique in time domain. Simulations are presented to illustrate the ability of the tool to infer wave conversions between acoustic and gravity waves in a windy atmosphere, and non linear effects induced by large-amplitude waves.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFM.S11C2479B
- Keywords:
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- 7219 Seismic monitoring and test-ban treaty verification;
- SEISMOLOGYDE: 7294 Seismic instruments and networks;
- SEISMOLOGYDE: 7299 General or miscellaneous;
- SEISMOLOGY