search for the presence of electric and magnetic signals, in the high atmosphere, related to seismic and/or volcanic crises on the Earth and more particularly signals related to the seismic break or volcanic eruption preparatory phase;
determine the neutral atmosphere and ionosphere disturbances characteristics equally related to seismic activity after but also before events;
search for cases of particles' precipitations that are related to these events.

The second DEMETER objective is to:

determine the nature of these signals (closely related to the previous objective) as well as all their spectral, spatial and temporal characteristics.
allow the determination of the signals apparition conditions at high altitude as well as their variability following on one hand the event geophysical characteristics and, on the other hand atmospheric, ionospheric and magnetospheric conditions.
This last aspect of the project will constitute an essential contribution to the geophysical community effort to understand the generating mechanisms as well as these signals propagation conditions.