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

Moment Tensor Solution
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.

Moment Tensor Solution

Details on the W-phase inversion algorithm.