USGS WPhase Moment Solution
WEST OF MACQUARIE ISLAND
12/10/18 1:27:15.00 Epicenter: -54.273 143.918 MW 5.9 USGS/WPHASE CENTROID MOMENT TENSOR 12/10/18 1:27:15.00 Centroid: -54.173 143.404 Depth 13 No. of sta: 48 Moment Tensor; Scale 10**17 Nm Mrr=-0.72 Mtt= 2.16 Mpp=-1.44 Mrt= 1.54 Mrp= 1.12 Mtp=-8.19 Principal axes: T Val= 8.78 Plg= 3 Azm= 38 N = -0.31 76 295 P = -8.46 13 129 Best Double Couple:Mo=8.6*10**17 NP1:Strike=173 Dip=78 Slip= -7 NP2: 265 83 -168
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.
