USGS Centroid Moment Solution
VANUATU
12/03/09 07:09:53.43 Epicenter: -19.115 169.643 MW 6.7 USGS CENTROID MOMENT TENSOR 12/03/09 07:10:12.59 Centroid: -18.928 169.366 Depth 16 No. of sta: 44 Moment Tensor; Scale 10**19 Nm Mrr=-1.10 Mtt= 0.39 Mpp= 0.70 Mrt=-0.23 Mrp=-0.39 Mtp=-0.60 Principal axes: T Val= 1.18 Plg= 4 Azm= 54 N 0.07 19 145 P -1.25 70 311 Best Double Couple:Mo=1.2*10**19 NP1:Strike=341 Dip=52 Slip= -65 NP2: 124 44 -118
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.
