USGS WPhase Moment Solution

VANUATU

11/09/03 22:55:36

Epicenter: -20.584  169.696
MW 7.0

USGS/WPHASE CENTROID MOMENT TENSOR
11/09/03 22:55:36.00
Centroid:  -20.484  169.589
Depth 160         No. of sta: 37
Moment Tensor;   Scale 10**19 Nm
  Mrr= 1.12       Mtt= 1.18
  Mpp=-2.30       Mrt= 2.64
  Mrp=-2.00       Mtp= 1.42
 Principal axes:
  T  Val=  3.83  Plg=46  Azm=  6
  N     =  0.53      29      132
  P     = -4.36      28      240

Best Double Couple:Mo=4.1*10**19
 NP1:Strike= 20 Dip=31 Slip= 161
 NP2:       127     80        60

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.