  The exploitation of copper ore deposits in Polish underground mines is
performed primarily by the use of blasting technology which seems to be
relatively well suited to the hardness of the local rocks and to local mining
and geological conditions. Blasting works are also recognized as an active
method of seismic events prevention, conducted as group strain-release blasting
within potentially instable main roof strata and in pillars. A notable number
of recorded dynamic events can be clearly explained by the blasting works
effects. However, these operations are presently conducted intuitively based on
a trial-and-errors basis, rather than upon an intentional and scientifically
justified approach. As a one of seismic hazard reduction measures, a special
kind of group winning blasting conducted with appropriately selected delays
between the successive face-detonations is presented in the paper. This
approach is able to amplify purposely the energy of rock mass vibration within
the area which has been identified by the FEM modeling as a potentially
instable. As a result of the entire multi-faces blasting operation one may
expect the rock mass possibly distressing manifested as a seismic event. The
presented analyses have been supported by a 3D FEM dynamic modelling of
multi-face blasting in different configurations of space and time coordinates.
