USGS Body-Wave Moment Tensor Solution
SOUTH ISLAND OF NEW ZEALAND
11/12/23 02:18:02.51 Epicenter: -43.503 172.837 MW 5.8 USGS MOMENT TENSOR SOLUTION Depth 8 No. of sta: 20 Moment Tensor; Scale 10**17 Nm Mrr= 1.98 Mtt=-1.62 Mpp=-0.36 Mrt=-2.27 Mrp=-5.75 Mtp=-2.71 Principal axes: T Val= 6.68 Plg=51 Azm= 91 N 0.59 19 206 P -7.27 33 309 Best Double Couple:Mo=7.0*10**17 NP1:Strike= 87 Dip=22 Slip= 153 NP2: 203 80 70
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.