USGS WPhase Moment Solution
KERMADEC ISLANDS, NEW ZEALAND
13/02/18 12:19:19 Epicenter: -30.682 -178.127 MW 5.9 USGS/WPHASE CENTROID MOMENT TENSOR 13/02/18 12:19:19.00 Centroid: -30.682 -178.127 Depth 40 No. of sta: 54 Moment Tensor; Scale 10**17 Nm Mrr= 6.57 Mtt=-1.77 Mpp=-4.79 Mrt=-0.15 Mrp= 4.94 Mtp=-2.48 Principal axes: T Val= 8.51 Plg=67 Azm=254 N = -0.97 12 18 P = -7.54 17 112 Best Double Couple:Mo=8.1*10**17 NP1:Strike=222 Dip=30 Slip= 117 NP2: 12 64 76
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.