On the efficiency of the method for selection of ionospheric precursors of earthquakes based on the parameters of Es and F2 layers

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   The results of the study of ionospheric parameter deviations from their
   background values in summer months of 1998-2002 are presented for
   Petropavlovsk-Kamchatsky ionospheric station of vertical sounding.
   Anomalous variations of virtual sporadic E layer (h'Es), reflection cutoff
   frequency from Es (fEs) and critical frequencies of F2 (foF2) layer, which
   can be attributed to the possible earthquake precursors, were selected.
   High efficiency of the applied method for detection of ionospheric
   precursors of earthquakes basing on several parameters of Es and F2 layers
   has been shown. The empirical dependence, which reflects the connection
   between the advance time of a precursor for an earthquake moment with its
   magnitude and epicentral distance to the observation site, has been
   obtained. This dependence is consistent with the results of detection of
   earthquake precursors on the basis of measurement of the Earth's crust
   physical parameters in the same region.