USGS Body-Wave Moment Tensor Solution
12/12/02 00:54:20.66 Epicenter: -17.035 167.636 MW 6.0 USGS MOMENT TENSOR SOLUTION Depth 34 No. of sta: 42 Moment Tensor; Scale 10**18 Nm Mrr= 1.26 Mtt=-0.46 Mpp=-0.80 Mrt= 0.25 Mrp=-0.20 Mtp= 0.72 Principal axes: T Val= 1.30 Plg=82 Azm= 24 N 0.11 3 141 P -1.41 7 231 Best Double Couple:Mo=1.4*10**18 NP1:Strike=325 Dip=38 Slip= 96 NP2: 138 52 86
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.