HR: 17:00h
AN: U32C-04    [PDF]
TI: Acoustic-Gravity Waves Induced by Earthquakes: Insights From Observations and Numerical Modeling
AU: * Artru, J
EM: juliette@gps.caltech.edu
AF: California Institute of Technology, Seismological Laboratory, MC 252-21 1200 E California Blvd, Pasadena, CA 91125 United States
AU: Ducic, V
EM: ducic@ipgp.jussieu.fr
AF: Institut de Physique du Globe de Paris, D\'epartement de G\'eophysique Spatiale et Plan\'etaire 4, avenue de Neptune, Saint-Maur, 94107 France
AU: Farges, T
EM: thomas.farges@cea.fr
AF: Commissariat \`a l'\'Energie Atomique, D\'epartement Analyse Surveillance Environnement, BP 12,, Bruyeres-le-Chatel, 91680 France
AU: Kanamori, H
EM: hiroo@gps.caltech.edu
AF: California Institute of Technology, Seismological Laboratory, MC 252-21 1200 E California Blvd, Pasadena, CA 91125 United States
AU: Lognonne, P
EM: lognonne@ipgp.jussieu.fr
AF: Institut de Physique du Globe de Paris, D\'epartement de G\'eophysique Spatiale et Plan\'etaire 4, avenue de Neptune, Saint-Maur, 94107 France
AU: Tromp, J
EM: jtromp@gps.caltech.edu
AF: California Institute of Technology, Seismological Laboratory, MC 252-21 1200 E California Blvd, Pasadena, CA 91125 United States
AB: Surface waves emitted after large earthquakes are known to induce, by dynamic coupling, atmospheric infrasonic and gravity waves propagating upward in the atmosphere. Those waves can be detected at ionospheric heights using a variety of techniques, such as Doppler or GPS ionospheric sounding, facilitating systematic monitoring. This opens new perspectives for remote sensing of solid earth events, or the study of solid Earth and atmosphere structure. However, in order to obtain quantitative information from these data, propagation effects due to the atmosphere must be separated from those due to the solid Earth structure. We present a number of modeling approaches to study the relative contribution of source mechanism, solid Earth and atmospheric structure, viscous dissipation and thermal conduction on the propagation of these waves. In order to validate these models, we tested our simulations with some benchmarks cases of simple solid or atmospheric source, as well as with several recent ionospheric observations of earthquakes.
DE: 3360 Remote sensing
DE: 7255 Surface waves and free oscillations
DE: 7260 Theory and modeling
DE: 9820 Techniques applicable in three or more fields
SC: U
MN: 2003 Fall Meeting