USGS Centroid Moment Solution

SOUTHEAST OF LOYALTY ISLANDS

12/03/03 12:19:52.90

Epicenter: -22.115  170.349
MW 6.6

USGS CENTROID MOMENT TENSOR
12/03/03 12:20:13.59
Centroid: -22.475  170.157
Depth  10         No. of sta: 83
Moment Tensor;   Scale 10**18 Nm
  Mrr=-0.62       Mtt=-2.52
  Mpp= 3.14       Mrt= 2.41
  Mrp=-4.25       Mtp= 7.10
 Principal axes:
  T  Val=  8.54  Plg=15  Azm=120
  N        1.00      59        3
  P       -9.54      27      218

Best Double Couple:Mo=9.0*10**18
 NP1:Strike=256 Dip=60 Slip=  -9
 NP2:       351     82      -149

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