USGS WPhase Moment Solution

10/ 7/18 13:34:59.00

Epicenter:  -5.930  150.590
MW 7.4

USGS/WPHASE CENTROID MOMENT TENSOR
10/ 7/18 13:34:59.00
Centroid:   -6.030  150.489
Depth  23         No. of sta: 29
Moment Tensor;   Scale 10**20 Nm
  Mrr= 1.15       Mtt=-1.09
  Mpp=-0.05       Mrt= 1.25
  Mrp= 0.41       Mtp=-0.15
 Principal axes:
  T  Val=  1.76  Plg=64  Azm=335
  N     = -0.05       4       76
  P     = -1.70      24      168

Best Double Couple:Mo=1.7*10**20
 NP1:Strike=269 Dip=21 Slip= 104
 NP2:        74     70        85

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.