USGS Body-Wave Moment Tensor Solution
BOUGAINVILLE REGION, P.N.G.
13/04/14 01:32:24.30 Epicenter: -6.512 154.595 MW 6.4 USGS MOMENT TENSOR SOLUTION Depth 31 No. of sta: 62 Moment Tensor; Scale 10**18 Nm Mrr= 3.92 Mtt=-0.39 Mpp=-3.53 Mrt= 1.41 Mrp=-1.55 Mtp= 2.97 Principal axes: T Val= 4.41 Plg=76 Azm= 26 N 1.34 7 147 P -5.75 12 238 Best Double Couple:Mo=5.2*10**18 NP1:Strike=338 Dip=34 Slip= 103 NP2: 142 57 81
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.