USGS WPhase Moment Solution

VANUATU

11/ 8/20 16:55:2.00

Epicenter: -18.260  168.069
MW 7.2

USGS/WPHASE CENTROID MOMENT TENSOR
11/ 8/20 16:55: 2.00
Centroid:  -18.360  167.858
Depth  35         No. of sta: 42
Moment Tensor;   Scale 10**19 Nm
  Mrr= 5.18       Mtt=-0.17
  Mpp=-5.01       Mrt= 2.92
  Mrp=-3.33       Mtp= 1.73
 Principal axes:
  T  Val=  6.97  Plg=67  Azm= 32
  N     =  0.00      12      153
  P     = -6.97      19      247

Best Double Couple:Mo=7.0*10**19
 NP1:Strike=357 Dip=28 Slip= 116
 NP2:       147     65        77

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.