USGS Centroid Moment Solution
VANUATU
12/02/02 13:34:42.32 Epicenter: -17.801 167.077 MW 7.1 USGS CENTROID MOMENT TENSOR 12/02/02 13:35:04.20 Centroid: -16.915 167.096 Depth 23 No. of sta: 183 Moment Tensor; Scale 10**19 Nm Mrr=-3.23 Mtt=-0.96 Mpp= 4.18 Mrt=-1.24 Mrp= 2.53 Mtp= 2.26 Principal axes: T Val= 5.49 Plg=13 Azm=287 N -0.55 31 189 P -4.94 56 37 Best Double Couple:Mo=5.2*10**19 NP1:Strike= 51 Dip=42 Slip= -39 NP2: 173 65 -125
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.
