USGS/SLU Regional Moment Solution
SOUTH ISLAND OF NEW ZEALAND
11/02/21 23:51:41.01 SOUTH ISLAND OF NEW ZEALAND Epicenter: -43.638 172.819 MW 6.2 USGS/SLU REGIONAL MOMENT TENSOR Depth 14 No. of sta: 36 Moment Tensor; Scale 10**18 Nm Mrr= 1.11 Mtt=-0.53 Mpp=-0.58 Mrt= 1.12 Mrp= 0.91 Mtp=-1.81 Principal axes: T Val= 1.68 Plg=63 Azm= 1 N 1.20 18 232 P -2.88 20 135 Best Double Couple:Mo=2.5*10**18 NP1:Strike=198 Dip=30 Slip= 52 NP2: 60 67 109
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 form 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.