USGS WPhase Moment Solution

FOX ISLANDS, ALEUTIAN ISLANDS

11/ 9/ 2 10:55:54.00

Epicenter:  52.185 -171.684
MW 6.9

USGS/WPHASE CENTROID MOMENT TENSOR
11/ 9/ 2 10:55:54.00
Centroid:   52.785 -171.849
Depth  45         No. of sta: 82
Moment Tensor;   Scale 10**19 Nm
  Mrr= 1.07       Mtt= 0.69
  Mpp=-1.76       Mrt= 0.63
  Mrp= 1.77       Mtp= 0.79
 Principal axes:
  T  Val=  2.41  Plg=50  Azm=318
  N     =  0.26      29      185
  P     = -2.67      23       81

Best Double Couple:Mo=2.6*10**19
 NP1:Strike=128 Dip=34 Slip=  28
 NP2:        14     75       120

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.