USGS Body-Wave Moment Tensor Solution
BOUGAINVILLE REGION, P.N.G.
13/09/02 04:30:16.51 Epicenter: -6.535 155.083 MW 5.8 USGS MOMENT TENSOR SOLUTION Depth 35 No. of sta: 25 Moment Tensor; Scale 10**17 Nm Mrr= 6.12 Mtt=-5.23 Mpp=-0.90 Mrt=-0.03 Mrp=-0.54 Mtp= 3.10 Principal axes: T Val= 6.17 Plg=85 Azm=107 N 0.68 5 298 P -6.85 1 208 Best Double Couple:Mo=6.5*10**17 NP1:Strike=292 Dip=44 Slip= 83 NP2: 123 46 97
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.