USGS WPhase Moment Solution

HAIDA GWAII, CANADA

12/10/30  2:49:2.00

Epicenter:  52.323 -131.907
MW 6.2

USGS/WPHASE CENTROID MOMENT TENSOR
12/10/30  2:49: 2.00
Centroid:   52.323 -132.071
Depth  11         No. of sta: 39
Moment Tensor;   Scale 10**18 Nm
  Mrr=-1.90       Mtt= 1.14
  Mpp= 0.76       Mrt=-0.98
  Mrp=-0.27       Mtp=-0.97
 Principal axes:
  T  Val=  2.04  Plg= 9  Azm=215
  N     =  0.25      19      122
  P     = -2.28      68      329

Best Double Couple:Mo=2.2*10**18
 NP1:Strike=327 Dip=40 Slip= -58
 NP2:       109     57      -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.