USGS WPhase Moment Solution

VANUATU

12/ 3/ 9  7: 9:54.00

Epicenter: -19.108  169.625
MW 6.7

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 3/ 9  7: 9:54.00
Centroid:  -18.808  169.625
Depth  11         No. of sta: 25
Moment Tensor;   Scale 10**18 Nm
  Mrr=-8.97       Mtt= 3.02
  Mpp= 5.96       Mrt=-5.30
  Mrp= 3.79       Mtp=-6.35
 Principal axes:
  T  Val= 12.82  Plg=16  Azm=229
  N     = -1.72       9      136
  P     =-11.10      70       16

Best Double Couple:Mo=1.2*10**19
 NP1:Strike=334 Dip=30 Slip= -70
 NP2:       131     62      -101

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.