Caltech
Email:
juliette@gps.caltech.edu
poster/oral: poster
| The dynamic coupling between the "solid" earth and the atmosphere is particularly efficient in the domain of surface waves propagation. Although the atmospheric perturbation induced by a Rayleigh wave at the ground level is very small, a upward propagating acoustic-gravity wave is created and strongly amplified up to 200 km high. Since the 60s ionospheric sounding networks have detected such oscillations on Doppler measurements, and now this observation is performed systematically for M>6.5 earthquakes. On the other hand, atmospheric disturbances are known to produce signals on seismic measurement. e.g. after explosions or volcanic eruptions. We present here the extension of normal-mode computations to a global model including the solid earth ant its atmosphere. This allows to predict the ionospheric measurements of seismic waves, and to understand the origin of seismic signals from atmospheric events. We will then focus on the perspectives open by such studies in global seismology problems. |