USGS Centroid Moment Solution
SOUTH ISLAND OF NEW ZEALAND
11/12/23 02:18:02.51 Epicenter: -43.503 172.837 MW 5.9 USGS CENTROID MOMENT TENSOR 11/12/23 02:18:25.50 Centroid: -43.601 173.045 Depth 17 No. of sta: 20 Moment Tensor; Scale 10**17 Nm Mrr= 4.30 Mtt= 0.33 Mpp=-4.63 Mrt= 4.06 Mrp=-2.65 Mtp=-5.65 Principal axes: T Val= 9.01 Plg=46 Azm= 33 N -0.69 44 213 P -8.32 0 123 Best Double Couple:Mo=8.7*10**17 NP1:Strike= 68 Dip=60 Slip= 144 NP2: 178 59 36
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.
