USGS WPhase Moment Solution

SOUTH ISLAND OF NEW ZEALAND

11/12/23  0:58:36

Epicenter: -43.488  172.976
MW 5.8

USGS/WPHASE CENTROID MOMENT TENSOR
11/12/23 00:58:36.00
Centroid:  -43.888  172.563
Depth  11         No. of sta: 18
Moment Tensor;   Scale 10**17 Nm
  Mrr= 1.13       Mtt= 2.44
  Mpp=-3.58       Mrt= 3.85
  Mrp= 4.96       Mtp=-2.92
 Principal axes:
  T  Val=  5.87  Plg=46  Azm=345
  N     =  2.73      25      224
  P     = -8.61      32      117

Best Double Couple:Mo=7.2*10**17
 NP1:Strike=154 Dip=27 Slip=  17
 NP2:        49     82       116

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.