USGS Body-Wave Moment Tensor Solution
NEW BRITAIN REGION, P.N.G.
13/03/10 22:51:51.61 Epicenter: -6.653 148.155 MW 6.5 USGS MOMENT TENSOR SOLUTION Depth 28 No. of sta: 42 Moment Tensor; Scale 10**18 Nm Mrr= 0.87 Mtt=-0.49 Mpp=-0.39 Mrt=-2.67 Mrp= 0.35 Mtp= 6.58 Principal axes: T Val= 6.63 Plg=17 Azm=137 N 0.94 68 274 P -7.57 15 43 Best Double Couple:Mo=7.2*10**18 NP1:Strike=271 Dip=89 Slip= 22 NP2: 180 68 178
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.