USGS WPhase Moment Solution

SOUTHEAST OF LOYALTY ISLANDS

12/10/23  9:39:31.00

Epicenter: -22.316  171.675
MW 5.8

USGS/WPHASE CENTROID MOMENT TENSOR
12/10/23  9:39:31.00
Centroid:  -22.216  171.459
Depth 100         No. of sta: 25
Moment Tensor;   Scale 10**17 Nm
  Mrr= 1.19       Mtt=-3.32
  Mpp= 2.13       Mrt= 4.22
  Mrp= 3.63       Mtp= 3.22
 Principal axes:
  T  Val=  7.79  Plg=39  Azm=303
  N     = -1.80      39       75
  P     = -5.99      26      189

Best Double Couple:Mo=7.1*10**17
 NP1:Strike=330 Dip=41 Slip= 168
 NP2:        69     82        50

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.