MICROSEISMIC VIBRATION MEASUREMENTS WITH Vp/Vs ASSESSMENT AT THE CHARTAK RESERVOIR DAM

Abstract

This paper presents the results of a study of microseismical vibrations and the possibility of estimating the Vp/Vs ratio, as well as the physical parameters of dam conditions, using the Chartak Reservoir as an example. The Nakamura method was used to obtain the ratios of the spectra of the horizontal components of microseismical vibrations to the spectrum of their vertical components (H/V ratios). Determining the H/V ratio and Kg revealed that the seismic instability coefficient Kg at the dam crest does not exceed 17.8. It was also found that an inclined seismic impact increases the amplitude amplification factor of the Chartak Reservoir dam vibrations.