From hypothesis of undeground discharges towards models of relationship of seismicity and electromagnetic effects

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   Up till now the analysis of mechanisms of occurrence of electromagnetic
   (EM) anomalies before earthquakes (ionospherical perturbations being
   involved), and the mechanisms of electromagnetic action (EMA) on the
   seismicity have been carried out independently from each other. Several
   models describing energy conversion from mechanical form to
   electromagnetic one (the physics of precursors), and vise versa were
   discussed during the 5-th Conference on Solar-Terrestrial Relations and
   Physics of Earthquake Precursors. The unified approach to the problem of
   seismic electromagnetic relationship is of interest. This implies the
   integration of models, describing unilateral nondissipative energy
   conversions. The fundamental for such approach is the expression for
   generalized pulse of EM field and substance, the interaction being
   considered as partial pulse transfer from the substance with charged
   particles to EM field, or vise versa. On can derive by dimensions method
   (immediately from the structure of Electrodynamics equation) the frame
   estimates of limiting value of telluric current density, for which the
   excitation of acoustic and seismo-acoustic waves is expected. These waves
   are able to play triggering role for seismic shifts. The values of mass
   velocities have been also estimated, for which the occurrence of EM
   anomalies in solid Earth becomes possible. The comparison with the results
   on ionospherical perturbations, caused by internal gravitational waves or
   acoustic gravitational waves propagating from the Earth surface though
   atmosphere, has revealed the following. The order of above evaluation of
   mass velocity is in agreement with the typical level of amplitude
   ( ~ 10 см) at cyclic frequency  ~ 0.01 1/s. Beside the
   approach of general Physics, some scenarios of seismoelectric or
   electromagnetic - seismic effects have been analyzed in the paper as well.