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Experimental confirmation of the correlation between possible earthquake precursors in near-surface quasi-static electric fields and the ionosphere
The data of simultaneous measurements of the parameters of the ionospheric Es- and F2-layers and the electric potential vertical gradient in the near-ground atmosphere during the preparation of crustal earthquakes with M=5.0-6.2 in Kamchatka region are considered. The appearance of anomalously high Es, accompanied by an increase in frequency parameters of the sporadic layer and the regular F2 layer, was detected on the days when the previously identified possible earthquakes precursors in atmospheric electric fields were noted. Two groups of supposed precursors of earthquakes in the ionosphere with different lead times about the earthquake time, from several hours to two weeks, have been identified. Empirical dependences connecting the lead time of earthquake moment (from the moment of corresponding anomaly occurrence in the ionosphere or in the near-ground atmospheric electric field to a shock) and the epicentral distance to the observation point with the magnitude of an earthquake are presented. These dependences are different for the two groups of supposed earthquake precursors, but are close within each of the groups for probable earthquake precursors identified by measurements of the quasi-static electric field and detected in ionospheric parameters changes.
KORSUNOVA L.P., MIKHAILOV YU.M., HEGAI V.V., LESHCHENKO L.N., SMIRNOV S.E., BOGDANOV V.V. Experimental confirmation of the correlation between possible earthquake precursors in near-surface quasi-static electric fields and the ionosphere. // Geomagnetism and Aeronomy. 2010. Vol.50. Issue No. 7, pp.908-914.
