USGS WPhase Moment Solution


12/12/11  6:18:27

Epicenter:   0.594  126.247
MW 6.0

12/12/11 06:18:27.00
Centroid:    0.394  126.147
Depth  40         No. of sta: 28
Moment Tensor;   Scale 10**17 Nm
  Mrr= 9.51       Mtt=-0.16
  Mpp=-9.35       Mrt= 3.24
  Mrp=-1.88       Mtp=-4.04
 Principal axes:
  T  Val= 10.95  Plg=68  Azm= 24
  N     = -0.06      21      199
  P     =-10.89       1      290

Best Double Couple:Mo=1.1*10**18
 NP1:Strike= 40 Dip=47 Slip= 119
 NP2:       181     50        62

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.