USGS Body-Wave Moment Tensor Solution
KERMADEC ISLANDS, NEW ZEALAND
13/02/18 16:32:50.03 Epicenter: -30.643 -178.106 MW 5.8 USGS MOMENT TENSOR SOLUTION Depth 70 No. of sta: 9 Moment Tensor; Scale 10**17 Nm Mrr= 2.83 Mtt=-1.59 Mpp=-1.24 Mrt= 4.44 Mrp=-0.89 Mtp=-2.30 Principal axes: T Val= 6.12 Plg=53 Azm= 26 N -1.13 26 256 P -4.99 25 154 Best Double Couple:Mo=5.6*10**17 NP1:Strike=203 Dip=31 Slip= 32 NP2: 84 74 117
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.
