USGS Body-Wave Moment Tensor Solution
NEAR S COAST OF NEW GUINEA, PNG.
12/12/08 16:35:16.97 Epicenter: -7.184 143.971 MW 5.6 USGS MOMENT TENSOR SOLUTION Depth 4 No. of sta: 23 Moment Tensor; Scale 10**17 Nm Mrr= 3.71 Mtt=-2.34 Mpp=-1.37 Mrt= 1.15 Mrp=-0.71 Mtp= 1.20 Principal axes: T Val= 3.97 Plg=79 Azm= 30 N -0.56 1 124 P -3.41 11 214 Best Double Couple:Mo=3.7*10**17 NP1:Strike=305 Dip=34 Slip= 91 NP2: 123 56 89
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.