USGS WPhase Moment Solution

KERMADEC ISLANDS, NEW ZEALAND

13/02/18 16:32:46

Epicenter: -30.693 -178.135
MW 5.5

USGS/WPHASE CENTROID MOMENT TENSOR
13/02/18 16:32:46.00
Centroid:  -30.893 -178.135
Depth  30         No. of sta: 21
Moment Tensor;   Scale 10**17 Nm
  Mrr= 1.93       Mtt=-0.24
  Mpp=-1.69       Mrt= 0.19
  Mrp= 1.75       Mtp=-0.31
 Principal axes:
  T  Val=  2.64  Plg=67  Azm=273
  N     = -0.18       2        8
  P     = -2.46      21       99

Best Double Couple:Mo=2.6*10**17
 NP1:Strike=194 Dip=23 Slip=  96
 NP2:         8     67        87

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.