USGS WPhase Moment Solution

OFF E. COAST OF N. ISLAND, N.Z.

13/02/16  5:16:18

Epicenter: -36.129  178.045
MW 5.8

USGS/WPHASE CENTROID MOMENT TENSOR
13/02/16 05:16:18.00
Centroid:  -36.129  178.168
Depth 180         No. of sta:  8
Moment Tensor;   Scale 10**17 Nm
  Mrr= 3.67       Mtt= 0.60
  Mpp=-4.28       Mrt= 3.00
  Mrp= 2.31       Mtp=-1.90
 Principal axes:
  T  Val=  5.62  Plg=60  Azm=346
  N     =  0.41      21      212
  P     = -6.02      19      114

Best Double Couple:Mo=5.8*10**17
 NP1:Strike=173 Dip=32 Slip=  46
 NP2:        42     67       113

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.