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Seismo-ionosphere coupling processes have been investigated considering theGPS observed anomalous ionospheric Total Electron Content (TEC) variationsbefore strong earthquakes as their precursors. The numerical simulations'results of the TEC response on the vertical electric currents flowing betweenthe Earth and ionosphere during the earthquake (EQ) preparation time have beenperformed. Model experiments have been carried out using the Upper AtmosphereModel. The following currents' parameters were varied in: (i) direction (to orfrom the ionosphere); (ii) latitudinal zone of the sources' (EQ epicenters)location; (iii) currents' configuration: (1) grid nodes with "straight"currents were surrounded by "border" grid points with currents of oppositedirection ("return" currents); (2) the "return" currents were spread out overthe globe; (3) without "return" currents. Numerical simulations have shown thatelectric currents with density of 4\times10-8 A/m2 over the area of about 200km in longitude and 2500 km in latitude produce both positive and negative TECdisturbances with magnitude up to 35 % in agreement with GPS TEC observationsbefore EQs.

Modeling of the ionosphere response on the earthquake preparation