[S02-6] New directions in anthropogenic seismicity studies II

[S02-6-04] Possibilities of seismic monitoring in control of equipment and constructions of hydro-electric power plants condition

^○Victor Seleznev^{1, 2}, Aleksei Liseikin² (1.Geophysical Survey of the Russian Academy of Sciences, Obninsk, Russia, 2.Seismological Branch of Geophysical Survey of the Russian Academy of Sciences, Novosibirsk, Russia)

Hydro-electric power plants of Russia situated in earthquake-prone regions are equipped with systems of seismometric and seismological investigations. The systems are integrated in one seismological grid which is maintained by GS RAS so that observations in local zones become more detailed and it let to investigate the seismicity in regions of hydrotechnical constructions location at a higher level. The investigations show that oscillations which source is working equipment of hydro-electric power plant, natural oscillations of dams, hydroacoustic self-oscillations in water conducts are found in microseisms records even at vast distances. We have developed methods of detection of these oscillations from records. With the usage of archived records for 15 years in a row we've analyzed the changes of natural oscillations of Sayano-Shushenskaya hydro-electric power plant dam – the biggest HPP in Russia. The Analysis of records from the seismological grid let us study out the processes happened during the accident at HPP on 17 august 2009 that helped to find out its reasons. Developed method according to continuous records of seismic stations lets us realize remote monitoring of vibratory condition of working hydroelectric units; monitor technical condition of dams through changing of natural oscillations of construction; get additional objective information which is necessary for investigation of reasons of emergency on hydro-electric power plants.