Rock mass diagnostics based on microseismic monitoring data at Sheregesh deposit

Distribution of seismic events in rocks mass around a mineral deposit is studied, it is found that the distribution features conform with the local blasting operations and geology. Epicenters of concentration zones of seismic events are detected in the area of stoping and faulting between two ore locuses. Weakening planes generated under four chronologically ordered shocks are indentified. Occurrence of these planes is characterized, and the stress redistribution after blasting is analyzed. The authors apply an integrated approach to rockburst hazard prediction, including calculus of apparent velocity of migration of seismic events during the first ten minutes after a blast and the rockburst probability assessment. (paper)