USGS WPhase Moment Solution

WEST OF MACQUARIE ISLAND

12/10/18  1:27:15.00

Epicenter: -54.273  143.918
MW 5.9

USGS/WPHASE CENTROID MOMENT TENSOR
12/10/18  1:27:15.00
Centroid:  -54.173  143.404
Depth  13         No. of sta: 48
Moment Tensor;   Scale 10**17 Nm
  Mrr=-0.72       Mtt= 2.16
  Mpp=-1.44       Mrt= 1.54
  Mrp= 1.12       Mtp=-8.19
 Principal axes:
  T  Val=  8.78  Plg= 3  Azm= 38
  N     = -0.31      76      295
  P     = -8.46      13      129

Best Double Couple:Mo=8.6*10**17
 NP1:Strike=173 Dip=78 Slip=  -7
 NP2:       265     83      -168

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.