USGS WPhase Moment Solution

SOUTH OF KERMADEC ISLANDS

13/ 1/ 8 21:26:55.00

Epicenter: -34.429  179.170
MW 5.7

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 1/ 8 21:26:55.00
Centroid:  -34.629  179.291
Depth  17         No. of sta: 19
Moment Tensor;   Scale 10**17 Nm
  Mrr= 0.09       Mtt=-3.09
  Mpp= 3.00       Mrt=-1.72
  Mrp= 2.59       Mtp= 1.74
 Principal axes:
  T  Val=  4.58  Plg=28  Azm=276
  N     =  0.22      48      149
  P     = -4.79      27       22

Best Double Couple:Mo=4.7*10**17
 NP1:Strike= 59 Dip=48 Slip=   0
 NP2:       329     90       138

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.