USGS WPhase Moment Solution


12/11/11 18:19:42.00

Epicenter:  23.207   95.981
MW 5.5

12/11/11 18:19:42.00
Centroid:   22.807   95.655
Depth  11         No. of sta: 21
Moment Tensor;   Scale 10**17 Nm
  Mrr= 0.24       Mtt= 0.13
  Mpp=-0.38       Mrt= 0.31
  Mrp= 0.19       Mtp= 1.91
 Principal axes:
  T  Val=  1.89  Plg=12  Azm=319
  N     =  0.16      77      131
  P     = -2.05       1      228

Best Double Couple:Mo=2.0*10**17
 NP1:Strike=  3 Dip=80 Slip= 172
 NP2:        94     82        10

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.