USGS WPhase Moment Solution
KERMADEC ISLANDS, NEW ZEALAND
13/02/18 16:32:46 Epicenter: -30.693 -178.135 MW 5.5 USGS/WPHASE CENTROID MOMENT TENSOR 13/02/18 16:32:46.00 Centroid: -30.893 -178.135 Depth 30 No. of sta: 21 Moment Tensor; Scale 10**17 Nm Mrr= 1.93 Mtt=-0.24 Mpp=-1.69 Mrt= 0.19 Mrp= 1.75 Mtp=-0.31 Principal axes: T Val= 2.64 Plg=67 Azm=273 N = -0.18 2 8 P = -2.46 21 99 Best Double Couple:Mo=2.6*10**17 NP1:Strike=194 Dip=23 Slip= 96 NP2: 8 67 87
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.
