USGS WPhase Moment Solution


12/11/11  1:12:38.00

Epicenter:  23.029   95.926
MW 6.8

12/11/11  1:12:38.00
Centroid:   23.029   95.709
Depth  13         No. of sta: 45
Moment Tensor;   Scale 10**19 Nm
  Mrr=-0.02       Mtt= 0.16
  Mpp=-0.14       Mrt= 0.89
  Mrp=-0.22       Mtp= 2.09
 Principal axes:
  T  Val=  2.22  Plg=13  Azm=319
  N     =  0.12      66       83
  P     = -2.35      18      224

Best Double Couple:Mo=2.3*10**19
 NP1:Strike=  3 Dip=67 Slip=-176
 NP2:       271     86       -23

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.