USGS WPhase Moment Solution

NEW IRELAND REGION, P.N.G.

12/ 7/28 20: 4:0.00

Epicenter:  -4.733  153.173
MW 6.5

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 7/28 20: 4: 0.00
Centroid:   -4.633  153.273
Depth  60         No. of sta: 34
Moment Tensor;   Scale 10**18 Nm
  Mrr= 5.68       Mtt=-6.36
  Mpp= 0.68       Mrt= 4.43
  Mrp= 2.53       Mtp= 1.15
 Principal axes:
  T  Val=  8.16  Plg=62  Azm=310
  N     = -0.33      19       85
  P     = -7.83      17      182

Best Double Couple:Mo=8.0*10**18
 NP1:Strike=300 Dip=32 Slip= 130
 NP2:        76     66        68

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.