USGS/SLU Regional Moment Solution
SOUTH ISLAND OF NEW ZEALAND
13/08/16 03:09:10.18 Epicenter: -41.836 173.882 MW 5.8 USGS/SLU REGIONAL MOMENT TENSOR Depth 9 No. of sta: 32 Moment Tensor; Scale 10**17 Nm Mrr=-0.73 Mtt= 4.16 Mpp=-3.44 Mrt= 0.39 Mrp= 3.10 Mtp=-3.96 Principal axes: T Val= 5.98 Plg= 8 Azm=205 N 0.69 61 311 P -6.67 27 111 Best Double Couple:Mo=6.3*10**17 NP1:Strike=155 Dip=77 Slip= -26 NP2: 251 65 -166
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.