USGS WPhase Moment Solution

NEW BRITAIN REGION, P.N.G.

12/09/12  4:28:14

Epicenter:  -5.067  152.130
MW 5.4

USGS/WPHASE CENTROID MOMENT TENSOR
12/09/12 04:28:14.00
Centroid:   -5.067  152.130
Depth  45         No. of sta: 20
Moment Tensor;   Scale 10**17 Nm
  Mrr= 1.60       Mtt=-1.48
  Mpp=-0.12       Mrt= 0.92
  Mrp= 0.36       Mtp=-0.24
 Principal axes:
  T  Val=  1.89  Plg=73  Azm=330
  N     = -0.10       4       76
  P     = -1.79      15      168

Best Double Couple:Mo=1.8*10**17
 NP1:Strike=265 Dip=29 Slip= 100
 NP2:        74     61        84

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.