Aftershocks play a significant part in investigation of seismicity and stress-strain state of medium, aimed to predict further behavior of major earthquake source. They are also of great interest to define cluster dimension and structure of earthquake zone and as a source of information on medium reology and redistribution of postseismic deformations and stresses in space and time.

The South-Yakutia earthquake (April 20, 1989; 22-59-54.8±0.6 c; MLH=6.6±0.1; Kр=16.5±0.5; j=57.17°±0.05° N and l=122.31°±0.10° E; H=27±5 km) occurred in the south of Yakutia in northern spurs of Stanovoy ridge and was followed by many aftershocks. This work presents the results of statistical study of kinematics (spatial location) and dynamics (relative variation in spatial location) of aftershocks of the South-Yakutia earthquake aimed to find the relation between migration of stress-strain zone concentration and largest repeated shocks. Variations of average characteristics of stress-strain concentration zones and largest successive aftershock groups in space and time are considered, dynamic parameters of aftershock sources are determined and it is found that the spatio-temporal shock clustering and the decreasing of average dislocation radii took place prior to the largest repeated events of April 19, 1989 (Kр=13.7, MLH=5.2) and May 17, 1989 (Kр=14.8, MLH=6.0). These peculiarities of the aftershock process may be used to predict these largest repeated shocks.