Electromagnetic soundings of the earth crust and deformation processes in geosphere of the Bishkek geodynamic polygon (BGP)

Abstract

A new processing of materials on variations of seismicity of the Bishkek geodynamic polygon (BGP) under effect of electromagnetic (EM) soundings of geological medium has been carried out. The revision of these materials is topical due to following issue. During the period of 1983-1989 the disharges of the capacitor battery (so-called cold runs) were used for supply for EM soundings in addition to the MHD generator launchs (hot, or fire runs). Moreover, alternative source of EM soundings by bipolar current pulses (namely, the ERGU-600-2 equip) was used in the times of 90s. But previous studies paid low attention to electric injection to Earth Crust besides MHD generator hot runs. Motivated by such state of the art we have analysed temporal dependence of Benioff strain on the territory of the BGP in the overall period of EM soundings (from 1983 up to now). The alterations of EM soundings sources and operational modes have been taken into account. But our approach has reveal no no noticeable change seismic regime (by the Benioff strain data) during the nineties in close surrounding of the injecting dipole.