USGS WPhase Moment Solution

VANUATU

12/12/ 2  0:54:23.00

Epicenter: -17.012  167.626
MW 6.1

USGS/WPHASE CENTROID MOMENT TENSOR
12/12/ 2  0:54:23.00
Centroid:  -17.012  167.416
Depth  35         No. of sta: 44
Moment Tensor;   Scale 10**18 Nm
  Mrr= 1.58       Mtt=-0.90
  Mpp=-0.68       Mrt= 0.17
  Mrp=-0.29       Mtp= 0.95
 Principal axes:
  T  Val=  1.62  Plg=83  Azm= 77
  N     =  0.16       3      312
  P     = -1.78       5      221

Best Double Couple:Mo=1.7*10**18
 NP1:Strike=308 Dip=40 Slip=  84
 NP2:       135     51        95

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.