USGS WPhase Moment Solution

12/10/28  3:04: 8

Epicenter:  52.774 -131.843
MW 7.8

USGS/WPHASE CENTROID MOMENT TENSOR
12/10/28 03:04: 8.00
Centroid:   52.674 -131.843
Depth  15         No. of sta:247
Moment Tensor;   Scale 10**20 Nm
  Mrr= 4.00       Mtt=-2.39
  Mpp=-1.61       Mrt= 4.85
  Mrp=-2.81       Mtp= 2.08
 Principal axes:
  T  Val=  6.90  Plg=62  Azm= 24
  N     =  0.04       4      123
  P     = -6.94      27      215

Best Double Couple:Mo=6.9*10**20
 NP1:Strike=317 Dip=18 Slip= 105
 NP2:       122     72        85

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.