USGS Centroid Moment Solution

OFF W. COAST OF N. ISLAND, N.Z.

12/07/03 10:36:15.97

Epicenter: -39.976  173.693
MW 6.3

USGS CENTROID MOMENT TENSOR
12/07/03 10:36:47.00
Centroid: -39.167  173.676
Depth 267         No. of sta: 13
Moment Tensor;   Scale 10**18 Nm
  Mrr= 0.34       Mtt= 0.93
  Mpp=-1.27       Mrt= 2.18
  Mrp=-1.55       Mtp= 0.74
 Principal axes:
  T  Val=  2.89  Plg=43  Azm= 10
  N        0.20      25      127
  P       -3.10      36      237

Best Double Couple:Mo=3.0*10**18
 NP1:Strike= 26 Dip=26 Slip= 170
 NP2:       125     86        65

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