USGS/SLU Regional Moment Solution
SOUTH ISLAND OF NEW ZEALAND
11/06/13 02:20:48.09 Epicenter: -43.539 172.805 MW 5.9 USGS/SLU REGIONAL MOMENT TENSOR Depth 7 No. of sta: 21 Moment Tensor; Scale 10**17 Nm Mrr= 2.77 Mtt= 4.74 Mpp=-7.50 Mrt= 4.44 Mrp= 0.25 Mtp=-5.41 Principal axes: T Val= 9.36 Plg=32 Azm= 17 N 0.48 56 216 P -9.84 9 113 Best Double Couple:Mo=9.6*10**17 NP1:Strike=160 Dip=61 Slip= 18 NP2: 61 74 150
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.