USGS Centroid Moment Solution
SOUTHEAST OF LOYALTY ISLANDS
12/03/03 12:19:52.90 Epicenter: -22.115 170.349 MW 6.6 USGS CENTROID MOMENT TENSOR 12/03/03 12:20:13.59 Centroid: -22.475 170.157 Depth 10 No. of sta: 83 Moment Tensor; Scale 10**18 Nm Mrr=-0.62 Mtt=-2.52 Mpp= 3.14 Mrt= 2.41 Mrp=-4.25 Mtp= 7.10 Principal axes: T Val= 8.54 Plg=15 Azm=120 N 1.00 59 3 P -9.54 27 218 Best Double Couple:Mo=9.0*10**18 NP1:Strike=256 Dip=60 Slip= -9 NP2: 351 82 -149
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.
