USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

12/ 9/ 5 13: 9:9.00

Epicenter: -12.504  166.411
MW 6.0

USGS/WPHASE CENTROID MOMENT TENSOR
12/ 9/ 5 13: 9: 9.00
Centroid:  -12.404  166.104
Depth  21         No. of sta: 39
Moment Tensor;   Scale 10**18 Nm
  Mrr=-1.02       Mtt= 0.21
  Mpp= 0.81       Mrt=-0.68
  Mrp=-0.45       Mtp=-0.54
 Principal axes:
  T  Val=  1.13  Plg= 1  Azm= 60
  N     =  0.36      30      151
  P     = -1.50      59      327

Best Double Couple:Mo=1.4*10**18
 NP1:Strike=123 Dip=51 Slip=-130
 NP2:       357     54       -51

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.