USGS WPhase Moment Solution
VANUATU
12/ 2/ 2 13:34:38.00 Epicenter: -17.810 167.149 MW 7.1 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 2/ 2 13:34:38.00 Centroid: -17.410 167.044 Depth 30 No. of sta: 49 Moment Tensor; Scale 10**19 Nm Mrr=-2.77 Mtt=-1.41 Mpp= 4.17 Mrt=-2.10 Mrp=-0.59 Mtp= 2.32 Principal axes: T Val= 5.23 Plg= 9 Azm=112 N = -0.83 38 209 P = -4.40 50 10 Best Double Couple:Mo=4.9*10**19 NP1:Strike=166 Dip=49 Slip=-145 NP2: 51 65 -46
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.
