USGS WPhase Moment Solution

10/07/18 13:04:09

Epicenter:  -5.970  150.430
MW 6.9

USGS/WPHASE CENTROID MOMENT TENSOR
10/07/18 13:04: 9.00
Centroid:   -6.170  150.530
Depth  40         No. of sta: 31
Moment Tensor;   Scale 10**19 Nm
  Mrr= 2.77       Mtt=-0.04
  Mpp=-2.73       Mrt= 0.22
  Mrp= 0.16       Mtp=-0.61
 Principal axes:
  T  Val=  2.79  Plg=85  Azm=343
  N     =  0.08       3      192
  P     = -2.86       2      102

Best Double Couple:Mo=2.8*10**19
 NP1:Strike=188 Dip=43 Slip=  84
 NP2:        16     47        95

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.