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AN ESTIMATION OF THE EFFECTIVE ATTENUATION FOR P WAVES APPLIED TO THE CENTRAL PART OF THE EAST EUROPEAN CRATON BASED ON THE QUARRY BLASTS DATA
Abstract
The central part of the East European craton (EEC) is the site of extensive mining activity. The small aperture array ?Mikhnevo? (MHVAR) monitors the weak seismic events in the distance range about 500 km. The most of them are identified as industrial explosions using the S/P amplitude ratio, day-time distribution criteria, spectral content, recurrence and clustering of events. The detailed analysis of waveform variations allows monitoring of the change in the position of the explosion as well as the subtle changes in the technology of the blasting. Basing on array data and regular seismic measurements in the vicinity of quarries we estimate the effective attenuation for P waves. Experimental calibration curves for industrial explosions show strong variations with azimuth. The observed ground velocity is equivalent to the intensity I=1.5-2 near the quarries with the energy of explosions of the order 5В·108 J/year, and to the intensity of I=3, if the energy is of the order 5В·1010 J/year. Presumable maximum impact of the industrial explosions is estimated in case of simultaneous activity on all the sites. The central part of the EEC is vulnerable to seismic effects from minor quarry blasts similar to the area near big mining sites.
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