USGS WPhase Moment Solution

NEAR S COAST OF NEW GUINEA, PNG.

12/12/ 8 16:35:17.00

Epicenter:  -7.211  143.929
MW 5.6

USGS/WPHASE CENTROID MOMENT TENSOR
12/12/ 8 16:35:17.00
Centroid:   -7.111  143.929
Depth  15         No. of sta: 22
Moment Tensor;   Scale 10**17 Nm
  Mrr= 3.38       Mtt=-2.73
  Mpp=-0.65       Mrt= 1.68
  Mrp=-0.10       Mtp= 0.56
 Principal axes:
  T  Val=  3.81  Plg=75  Azm=357
  N     = -0.53       3      101
  P     = -3.28      13      192

Best Double Couple:Mo=3.6*10**17
 NP1:Strike=287 Dip=31 Slip=  97
 NP2:        99     59        86

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.