USGS WPhase Moment Solution
NEW IRELAND REGION, P.N.G.
12/ 7/28 20: 4:0.00 Epicenter: -4.733 153.173 MW 6.5 USGS/WPHASE CENTROID MOMENT TENSOR 12/ 7/28 20: 4: 0.00 Centroid: -4.633 153.273 Depth 60 No. of sta: 34 Moment Tensor; Scale 10**18 Nm Mrr= 5.68 Mtt=-6.36 Mpp= 0.68 Mrt= 4.43 Mrp= 2.53 Mtp= 1.15 Principal axes: T Val= 8.16 Plg=62 Azm=310 N = -0.33 19 85 P = -7.83 17 182 Best Double Couple:Mo=8.0*10**18 NP1:Strike=300 Dip=32 Slip= 130 NP2: 76 66 68
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.
