USGS Body-Wave Moment Tensor Solution
SOUTHEAST OF LOYALTY ISLANDS
12/03/03 12:19:56.66 Epicenter: -22.184 170.309 MW 6.6 USGS MOMENT TENSOR SOLUTION Depth 15 No. of sta: 41 Moment Tensor; Scale 10**18 Nm Mrr=-0.75 Mtt=-1.87 Mpp= 2.62 Mrt= 1.32 Mrp= 0.84 Mtp= 8.08 Principal axes: T Val= 8.98 Plg= 9 Azm=308 N -0.93 80 100 P -8.05 4 217 Best Double Couple:Mo=8.6*10**18 NP1:Strike=352 Dip=81 Slip= 177 NP2: 82 87 9
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.