USGS Body-Wave Moment Tensor Solution
NEW IRELAND REGION, P.N.G.
13/07/07 18:35:30.79 Epicenter: -3.923 153.920 MW 7.2 USGS MOMENT TENSOR SOLUTION Depth 387 No. of sta: 58 Moment Tensor; Scale 10**19 Nm Mrr=-6.52 Mtt= 0.61 Mpp= 5.91 Mrt= 1.58 Mrp=-0.40 Mtp=-1.97 Principal axes: T Val= 6.62 Plg= 4 Azm= 71 N 0.23 11 340 P -6.85 78 180 Best Double Couple:Mo=6.7*10**19 NP1:Strike=330 Dip=50 Slip=-105 NP2: 173 42 -73
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.