USGS Body-Wave Moment Tensor Solution
SOUTH ISLAND OF NEW ZEALAND
11/06/13 02:20:48.09 Epicenter: -43.539 172.805 MW 5.9 USGS MOMENT TENSOR SOLUTION Depth 7 No. of sta: 34 Moment Tensor; Scale 10**17 Nm Mrr= 3.33 Mtt= 4.16 Mpp=-7.49 Mrt= 3.02 Mrp= 0.21 Mtp=-3.89 Principal axes: T Val= 7.37 Plg=36 Azm= 14 N 1.41 54 205 P -8.77 5 108 Best Double Couple:Mo=8.2*10**17 NP1:Strike= 56 Dip=70 Slip= 149 NP2: 157 62 23
The figure above shows a visual representation of the style of faulting (focal mechanism) derived from the estimated moment tensor. Shaded areas show quadrants of the focal sphere in which the P-wave first-motions are away from the source, and unshaded areas show quadrants in which the P-wave first-motions are toward the source. The dots represent the axis of maximum compressional strain (in black, called the "P-axis") and the axis of maximum extensional strain (in white, called the "T-axis") resulting from the earthquake.