USGS Body-Wave Moment Tensor Solution
NEW IRELAND REGION, P.N.G.
12/07/28 20:03:56.76 Epicenter: -4.655 153.159 MW 6.5 USGS MOMENT TENSOR SOLUTION Depth 50 No. of sta: 59 Moment Tensor; Scale 10**18 Nm Mrr= 6.96 Mtt=-6.52 Mpp=-0.44 Mrt= 3.85 Mrp= 1.78 Mtp= 1.08 Principal axes: T Val= 8.43 Plg=70 Azm=319 N -0.84 14 91 P -7.60 14 185 Best Double Couple:Mo=8.1*10**18 NP1:Strike= 84 Dip=61 Slip= 74 NP2: 293 33 116
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.