USGS WPhase Moment Solution

NORTH ISLAND OF NEW ZEALAND

12/10/16 23:42:54.00

Epicenter: -38.538  176.117
MW 5.6

USGS/WPHASE CENTROID MOMENT TENSOR
12/10/16 23:42:54.00
Centroid:  -38.638  176.117
Depth 120         No. of sta: 19
Moment Tensor;   Scale 10**17 Nm
  Mrr= 0.01       Mtt= 1.17
  Mpp=-1.18       Mrt= 2.15
  Mrp=-2.66       Mtp=-0.11
 Principal axes:
  T  Val=  3.56  Plg=42  Azm= 32
  N     =  0.12      19      140
  P     = -3.67      41      248

Best Double Couple:Mo=3.6*10**17
 NP1:Strike= 49 Dip=19 Slip= 179
 NP2:       140     90        71

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.