USGS WPhase Moment Solution


12/11/27  2:59: 8

Epicenter:  -2.933  129.244
MW 5.7

12/11/27 02:59: 8.00
Centroid:   -2.533  129.144
Depth  21         No. of sta: 22
Moment Tensor;   Scale 10**17 Nm
  Mrr= 1.64       Mtt=-2.61
  Mpp= 0.97       Mrt= 0.56
  Mrp= 2.71       Mtp= 2.21
 Principal axes:
  T  Val=  4.55  Plg=43  Azm=291
  N     = -0.79      45      128
  P     = -3.76       8       29

Best Double Couple:Mo=4.2*10**17
 NP1:Strike= 80 Dip=54 Slip=  28
 NP2:       333     68       140

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.