The results of experiments on the study of the radiation characteristics of powerful vibrators and reception conditions at a number of seismic stations in the Altai-Sayan region in the range of distances of 50-450 kilometers in the problem of selecting points for active vibro-seismic monitoring are presented. It is shown that the real effective range of the CV-40 vibrator can be significantly increased by using multiple and semi-multiple harmonics. A method for assessing the applicability of stations for vibration monitoring using special programs for assessing the seismic background and seismic resonances within the boundaries of the location of seismic stations is proposed and tested.

The results of determining the depths of aftershocks of the Tuva earthquakes (Tuvinskoe 1 (27.12.2011, ML=6.7) and Tuvinskoe 2 (26.02.2012, ML=6.8)) using the travel times of longitudinal refracted waves from the Mokhorovichich border (Pn–waves) from regional seismic stations are presented. The depth and distribution of aftershock hypocenters obtained by this method correlate with the results from the data of the local network of seismic stations near the Tuva earthquakes.

The review of the Altai-Sayan region seismicity for 2013 is presented. The permanent seismic network included 41 stations. In addition, there were 4 local temporary networks in operation during the year with 55 stations in total. There were 11548 earthquakes recorded with the total seismic energy of 1.81·1015 J. The most significant earthquakes in 2013 occurred in the area of the Bachatsky coal mine on June 18 and in the Altai Republic on January 24, both with ML=6.1. A brief description of the seismicity of the Chui-Kurai zone of the Altai Mountains is given.

The aftershock process induced by the Ms = 7.0 Uureg Nuur earthquake, one of the largest events in the Altai, has been studied comprehensively. As an additional experiment, a temporary local network of seismic stations was deployed in 2006 in the epicentral area of the earthquake to gain more insights into the current tectonic activity. The aftershocks of the Uureg Nuur event were restricted to small faults in the interior of fault blocks rather than those being localized along border faults. Seismic activity across the directions of large faults has apparently been generated by a fault (in the Tsagaan Shuvuut Range) reactivated during the Uureg Nuur earthquake. The aftershock process, at its final phase, involved an adjacent crust block.