USGS WPhase Moment Solution

BISMARCK SEA

12/11/15  8:21:49

Epicenter:  -3.250  148.176
MW 5.9

USGS/WPHASE CENTROID MOMENT TENSOR
12/11/15 08:21:49.00
Centroid:   -2.950  148.376
Depth  15         No. of sta: 19
Moment Tensor;   Scale 10**17 Nm
  Mrr=-1.47       Mtt= 7.24
  Mpp=-5.77       Mrt= 1.43
  Mrp= 4.01       Mtp= 4.06
 Principal axes:
  T  Val=  9.04  Plg=14  Azm=340
  N     = -0.35      59      225
  P     = -8.68      26       78

Best Double Couple:Mo=8.9*10**17
 NP1:Strike=117 Dip=60 Slip=  -9
 NP2:       212     82      -150

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.