USGS WPhase Moment Solution

SOUTH OF KERMADEC ISLANDS

11/10/ 7  8:58:29.00

Epicenter: -32.387 -178.915
MW 6.1

USGS/WPHASE CENTROID MOMENT TENSOR
11/10/ 7  8:58:29.00
Centroid:  -32.187 -178.797
Depth  50         No. of sta: 40
Moment Tensor;   Scale 10**18 Nm
  Mrr= 1.48       Mtt=-0.15
  Mpp=-1.33       Mrt= 0.60
  Mrp= 0.92       Mtp=-0.67
 Principal axes:
  T  Val=  1.84  Plg=71  Azm=312
  N     =  0.14       4      207
  P     = -1.98      17      115

Best Double Couple:Mo=1.9*10**18
 NP1:Strike=198 Dip=28 Slip=  79
 NP2:        30     63        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.