USGS Body-Wave Moment Tensor Solution
NEW IRELAND REGION, P.N.G.
13/04/23 23:14:41.98 Epicenter: -3.911 152.127 MW 6.4 USGS MOMENT TENSOR SOLUTION Depth 13 No. of sta: 56 Moment Tensor; Scale 10**18 Nm Mrr= 0.19 Mtt= 4.29 Mpp=-4.48 Mrt=-0.91 Mrp=-0.09 Mtp= 1.51 Principal axes: T Val= 4.73 Plg=11 Azm=171 N 0.01 79 347 P -4.73 1 80 Best Double Couple:Mo=4.7*10**18 NP1:Strike=306 Dip=83 Slip= 9 NP2: 215 81 172
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.