USGS Body-Wave Moment Tensor Solution
NEW IRELAND REGION, P.N.G.
13/02/03 11:14:56.94 Epicenter: -5.074 153.069 MW 5.4 USGS MOMENT TENSOR SOLUTION Depth 16 No. of sta: 37 Moment Tensor; Scale 10**17 Nm Mrr= 1.04 Mtt=-0.36 Mpp=-0.68 Mrt=-0.16 Mrp= 0.97 Mtp= 0.98 Principal axes: T Val= 1.52 Plg=61 Azm=290 N 0.25 23 151 P -1.77 17 54 Best Double Couple:Mo=1.7*10**17 NP1:Strike=342 Dip=66 Slip= 115 NP2: 113 34 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.