USGS WPhase Moment Solution

BOUGAINVILLE REGION, P.N.G.

13/04/14  1:32:27

Epicenter:  -6.503  154.547
MW 6.6

USGS/WPHASE CENTROID MOMENT TENSOR
13/04/14 01:32:27.00
Centroid:   -6.303  154.547
Depth  35         No. of sta: 25
Moment Tensor;   Scale 10**19 Nm
  Mrr= 0.62       Mtt=-0.31
  Mpp=-0.30       Mrt= 0.68
  Mrp=-0.56       Mtp= 0.28
 Principal axes:
  T  Val=  1.08  Plg=62  Azm= 37
  N     = -0.03       2      131
  P     = -1.05      27      222

Best Double Couple:Mo=1.1*10**19
 NP1:Strike=318 Dip=17 Slip=  97
 NP2:       130     73        88

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.