USGS Body-Wave Moment Tensor Solution
NEW BRITAIN REGION, P.N.G.
13/07/07 20:30:07.47 Epicenter: -6.016 149.721 MW 6.6 USGS MOMENT TENSOR SOLUTION Depth 60 No. of sta: 9 Moment Tensor; Scale 10**19 Nm Mrr= 1.04 Mtt=-0.25 Mpp=-0.80 Mrt=-0.02 Mrp=-0.27 Mtp=-0.52 Principal axes: T Val= 1.09 Plg=81 Azm= 74 N 0.05 7 210 P -1.14 6 300 Best Double Couple:Mo=1.1*10**19 NP1:Strike= 38 Dip=39 Slip= 101 NP2: 204 52 82
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.