USGS WPhase Moment Solution

VANUATU

12/ 2/ 2 13:34:38.00

Epicenter: -17.810  167.149
MW 7.1

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 2/ 2 13:34:38.00
Centroid:  -17.410  167.044
Depth  30         No. of sta: 49
Moment Tensor;   Scale 10**19 Nm
  Mrr=-2.77       Mtt=-1.41
  Mpp= 4.17       Mrt=-2.10
  Mrp=-0.59       Mtp= 2.32
 Principal axes:
  T  Val=  5.23  Plg= 9  Azm=112
  N     = -0.83      38      209
  P     = -4.40      50       10

Best Double Couple:Mo=4.9*10**19
 NP1:Strike=166 Dip=49 Slip=-145
 NP2:        51     65       -46

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.