USGS Body-Wave Moment Tensor Solution
NEAR S COAST OF NEW GUINEA, PNG.
13/03/03 03:25:21.91 Epicenter: -7.190 145.896 MW 5.7 USGS MOMENT TENSOR SOLUTION Depth 191 No. of sta: 25 Moment Tensor; Scale 10**17 Nm Mrr= 0.68 Mtt= 0.55 Mpp=-1.23 Mrt= 1.22 Mrp= 2.94 Mtp= 1.82 Principal axes: T Val= 4.06 Plg=41 Azm=313 N -0.52 33 188 P -3.53 31 75 Best Double Couple:Mo=3.8*10**17 NP1:Strike=111 Dip=34 Slip= 11 NP2: 12 84 123
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.