USGS WPhase Moment Solution
VANUATU
12/ 4/14 22: 5:26.00 Epicenter: -18.997 168.771 MW 6.2 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 4/14 22: 5:26.00 Centroid: -18.797 168.665 Depth 13 No. of sta: 21 Moment Tensor; Scale 10**18 Nm Mrr=-2.28 Mtt= 2.56 Mpp=-0.28 Mrt=-0.40 Mrp= 0.17 Mtp= 1.32 Principal axes: T Val= 3.10 Plg= 3 Azm=158 N = -0.74 10 249 P = -2.36 78 52 Best Double Couple:Mo=2.8*10**18 NP1:Strike=237 Dip=43 Slip=-106 NP2: 79 49 -75
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.
