USGS WPhase Moment Solution


12/11/11 10:54:42.00

Epicenter:  22.757   95.901
MW 5.8

12/11/11 10:54:42.00
Centroid:   22.557   95.901
Depth  11         No. of sta: 29
Moment Tensor;   Scale 10**17 Nm
  Mrr= 0.63       Mtt=-1.43
  Mpp= 0.79       Mrt= 2.40
  Mrp= 0.27       Mtp= 5.58
 Principal axes:
  T  Val=  5.96  Plg=18  Azm=312
  N     =  0.46      66       92
  P     = -6.42      13      217

Best Double Couple:Mo=6.2*10**17
 NP1:Strike=354 Dip=67 Slip= 176
 NP2:        85     87        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.