Аннотация:The approach of the mining operations to the Saamsky fault (the Khibiny rock
massif) has resulted in changes in the stress-strain state of the rock mass and the
seismic regime, which is seen in an increase of a number of seismic events and
their energy. In the last decade, the large seismic events (energy more than
10 MJ) began to occur near the Saamsky fault area, which indicates the
activation of this fault. Each large seismic event is accompanied by a number of
smaller events—foreshocks and aftershocks. This study presents the results of a
retrospective analysis of microseismic monitoring data in the area of the
Saamsky Fault, which is one of the largest radial subvertical faults of the
Khibiny massif. The impact of the mining operations with approaching the fault
and the dynamics of seismicity has been analyzed. The causes of the activation
of seismicity and its migration have been defined. It is shown that the further
approaching of mining operations to the fault (such as extraction of the ore body
and driving of workings across the strike of the fault) can complicate the
geodynamic situation and requires further monitoring.