USGS WPhase Moment Solution
VANUATU
12/ 3/ 9 7: 9:54.00 Epicenter: -19.108 169.625 MW 6.7 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 3/ 9 7: 9:54.00 Centroid: -18.808 169.625 Depth 11 No. of sta: 25 Moment Tensor; Scale 10**18 Nm Mrr=-8.97 Mtt= 3.02 Mpp= 5.96 Mrt=-5.30 Mrp= 3.79 Mtp=-6.35 Principal axes: T Val= 12.82 Plg=16 Azm=229 N = -1.72 9 136 P =-11.10 70 16 Best Double Couple:Mo=1.2*10**19 NP1:Strike=334 Dip=30 Slip= -70 NP2: 131 62 -101
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.
