USGS Body-Wave Moment Tensor Solution

VANUATU

11/09/03 22:55:36.96

Epicenter: -20.619  169.714
MW 7.0

USGS MOMENT TENSOR SOLUTION
Depth 143         No. of sta: 51
Moment Tensor;   Scale 10**19 Nm
  Mrr= 1.63       Mtt=-0.03
  Mpp=-1.61       Mrt= 2.72
  Mrp=-1.79       Mtp= 1.66
 Principal axes:
  T  Val=  3.69  Plg=56  Azm= 11
  N        0.55      18      130
  P       -4.24      28      230

Best Double Couple:Mo=4.0*10**19
 NP1:Strike=359 Dip=24 Slip= 142
 NP2:       125     75        71

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