USGS Body-Wave Moment Tensor Solution
NORTH ISLAND OF NEW ZEALAND
12/10/16 23:42:54.81 Epicenter: -38.538 176.117 MW 5.7 USGS MOMENT TENSOR SOLUTION Depth 109 No. of sta: 14 Moment Tensor; Scale 10**17 Nm Mrr= 0.51 Mtt= 0.49 Mpp=-1.00 Mrt= 2.84 Mrp=-2.71 Mtp=-0.16 Principal axes: T Val= 4.21 Plg=46 Azm= 35 N -0.41 11 136 P -3.80 42 236 Best Double Couple:Mo=4.0*10**17 NP1:Strike= 34 Dip=11 Slip= 168 NP2: 136 88 79
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.