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The analysis of the VLF signals radiated by ground transmitters and received on board of the French DEMETER satellite, reveals a drop of the signals (scat- tering spot) connected with the occurrence of large earth- quakes. The extension of the "scattering spots" zone is large enough (1000-5000 km) and, probably, it increases with the magnitude of the "relative" earthquake. A possible model to explain the phenomenology, based on the acoustic grav- ity waves and the ionosphere turbulence, is proposed. The method of diagnostics applied to this study has the advan- tage to be a global one due to the world wide location of the powerful VLF transmitters and of the satellite reception. However, a specific disadvantage exists because the method requires rather a long time period of analysis due to the large longitudinal displacements among the successive satellite or- bits. At the moment, at least, one month seems to be neces- sary.

Global diagnostics of the ionospheric perturbations related to the seismic activity using the VLF radio signals collected on the DEMETER satellite