ABSTRACT
For the first time, the instrumental records of accelerations at the Kapchagay HPP facilities (soil, HPP building and channel dam) are provided at two 5-magnitude earthquakes, the foci of which are located at different distances from these facilities. The task was set to study spectral characteristics of these earthquakes in the points of instrumental recordings and to determine the period of the dam channel vibrations. The β spectral curves have been constructed. It was found that the spectral curves are the least different for the case of the channel dam, the most– for the registration point on the soil. Dominant periods of soil vibrations under the influence of 2 earthquakes vary within the range of 0.15-0.55 sec.
The period of the spectrum maximum, approximately equal to the period of vibration of the dam -0.59-0.67 sec. Recommendations are provided for increasing the number of registration points.
