USGS WPhase Moment Solution


12/12/17  0:28:55.00

Epicenter:  49.749  155.952
MW 5.6

12/12/17  0:28:55.00
Centroid:   49.549  156.107
Depth  45         No. of sta: 28
Moment Tensor;   Scale 10**17 Nm
  Mrr= 2.16       Mtt=-0.64
  Mpp=-1.52       Mrt= 1.10
  Mrp= 1.57       Mtp=-0.83
 Principal axes:
  T  Val=  2.91  Plg=68  Azm=307
  N     = -0.14       1      212
  P     = -2.77      21      122

Best Double Couple:Mo=2.8*10**17
 NP1:Strike=209 Dip=24 Slip=  85
 NP2:        34     66        92

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.