USGS Centroid Moment Solution


11/09/03 22:55:36.50

Epicenter: -20.616  169.721
MW 7.0

11/09/03 22:55:54.09
Centroid: -20.834  170.010
Depth 132         No. of sta: 24
Moment Tensor;   Scale 10**19 Nm
  Mrr= 1.13       Mtt= 1.18
  Mpp=-2.32       Mrt= 3.22
  Mrp=-2.27       Mtp= 1.40
 Principal axes:
  T  Val=  4.44  Plg=47  Azm=  9
  N        0.37      26      131
  P       -4.81      31      238

Best Double Couple:Mo=4.6*10**19
 NP1:Strike= 20 Dip=28 Slip= 162
 NP2:       126     82        63

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