ABSTRACT
Mine staff have reported a series of macroseismic events during the excavation of 406 orebody at sanshandao mine, which are mainly distributed
1 INTRODUCTION
Seismic monitoring offers the best insight into current rock mass damage process and failure related to mining-induced fault reactivation. Brittle failure can be recorded in real-time as seismic events. The degree of damage in a rock mass can have a dramatic effect on the properties of the seismic waves emitted from microseismic sources, notably on wave velocity and attenuation (Feustel 1998). Such changes have been used to describe the rock mass character. Lower velocity and higher attenuation is recorded in a heavily fractured rock mass as compared to a homogeneous and unfractured rock mass (Jiang 2003). Given this, it is expected that the state of damage in the rock mass would also have
at the 406 orebody shear zone on 645 level Figure 1.
