ИСТИНА

Earthquake catalogue of the Bishkek (Kyrgyzstan) geodynamic test area for 1967-2008 were analyzed with aim to study the properties of seismicity response to the power electromag-netic probing of the lithosphere in 1983-1990 and 2000-2005. Time variations of statistical pa-rameters usually used for investigation of background and transient modes of seismicity was analyzed in the 150-km vicinity of the probing dipole. Analysis is carried out on the two levels of time scales: first years – before, during and after probing series, and first days – during 10 days after each acts of probing. Main results obtained on the scale of first days are as follows: directly during probing GR b-value is significantly higher than in background mode; gradual decreasing of b-value follows after probing finishing has duration about one and half day; seismic activity slightly increases during probing; after probing, during b-value decreasing activity is minimal. Analysis on the scale of first years reveals time-variations of seismicity parameters, but there are no evidence to relate these variations with probing series. Revealed variations are typical signatures of preparation and after-action of tectonic earthquakes occurring in the studied area.