USGS WPhase Moment Solution

SOUTH ISLAND OF NEW ZEALAND

11/12/23  2:18: 2

Epicenter: -43.491  172.843
MW 5.9

USGS/WPHASE CENTROID MOMENT TENSOR
11/12/23 02:18: 2.00
Centroid:  -43.791  172.567
Depth  11         No. of sta: 14
Moment Tensor;   Scale 10**17 Nm
  Mrr= 2.08       Mtt= 2.43
  Mpp=-4.50       Mrt= 6.15
  Mrp= 2.81       Mtp=-3.82
 Principal axes:
  T  Val=  8.46  Plg=42  Azm=  5
  N     =  0.45      34      235
  P     = -8.91      27      124

Best Double Couple:Mo=8.7*10**17
 NP1:Strike=164 Dip=36 Slip=  15
 NP2:        62     81       125

Moment Tensor Solution
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.

Moment Tensor Solution

Details on the W-phase inversion algorithm.