Figure 36 Source mechanisms calculated, in plan view (left) and looking North (right). Spheres are scaled according to moment magnitude. The red lines represent the P-axes. The magenta lines represent the stress measurements by the mine. The red mesh h k Figure 3 Hudson plot (Hudson et al., 1989) for the mechanisms shown in Figure 2. Both crushtype (close to excavations with associated volume change) and slip-type source mechanisms are observed. Red area: explosive sources. Green area: slip-type sources. Blue area: crush-type sources. Left: cluster A. Middle: cluster B. Right: cluster C (see Figure 5 for spatial location of clusters).
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