USGS WPhase Moment Solution


12/07/06  2:28:22

Epicenter: -14.664  167.357
MW 6.3

12/07/06 02:28:22.00
Centroid:  -14.464  167.046
Depth 170         No. of sta: 59
Moment Tensor;   Scale 10**18 Nm
  Mrr= 3.38       Mtt=-0.50
  Mpp=-2.88       Mrt=-1.03
  Mrp=-1.38       Mtp= 1.41
 Principal axes:
  T  Val=  4.05  Plg=68  Azm=139
  N     = -0.41      20      340
  P     = -3.64       7      247

Best Double Couple:Mo=3.9*10**18
 NP1:Strike=316 Dip=42 Slip=  58
 NP2:       176     55       115

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.