MICROSEISMICITY DERIVED FAULT-PLANES AND THEIR RELATIONSHIP TO FOCAL MECHANISM, STRESS INVERSION, AND GEOLOGIC DATA

General stress and faulting trends have been retrieved through the analysis of mining induced microseismic events (M < 0) at two sites, related to an MN 2.6 rockburst, and an excavation at depth. A comparison of results obtained through principal component analysis (PCA) of seismicity, focal mechanism, and stress inversion, with in-situ measurements of stress and structural mapping data, show that: under stable stress conditions, the P, B, T, and stress inversion axes are consistent with in-situ measurements of stresses; stress inversion and PCA fault-planes lie within 10 to 20-degrees of the most significant mapped features at the sites; and the PCA technique provides a robust approach for the determination of fault-planes.