USGS WPhase Moment Solution
SOUTH ISLAND OF NEW ZEALAND
11/06/13 2:20:50 Epicenter: -43.580 172.740 MW 5.9 USGS/WPHASE CENTROID MOMENT TENSOR 11/06/13 02:20:50.00 Centroid: -43.680 172.740 Depth 11 No. of sta: 18 Moment Tensor; Scale 10**17 Nm Mrr= 1.80 Mtt= 4.41 Mpp=-6.21 Mrt= 3.88 Mrp=-1.54 Mtp=-6.02 Principal axes: T Val= 9.41 Plg=28 Azm= 23 N = -0.48 61 206 P = -8.93 1 114 Best Double Couple:Mo=9.2*10**17 NP1:Strike=163 Dip=69 Slip= 20 NP2: 66 71 158
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.
