USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/ 2/ 8 11:12:12.00

Epicenter: -10.925  165.874
MW 6.8

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/ 8 11:12:12.00
Centroid:  -10.725  165.773
Depth  15         No. of sta: 41
Moment Tensor;   Scale 10**19 Nm
  Mrr= 0.03       Mtt= 1.41
  Mpp=-1.43       Mrt=-0.10
  Mrp=-0.14       Mtp=-1.67
 Principal axes:
  T  Val=  2.18  Plg= 0  Azm=204
  N     =  0.04      85      103
  P     = -2.21       4      294

Best Double Couple:Mo=2.2*10**19
 NP1:Strike=340 Dip=86 Slip=  -2
 NP2:        70     88      -176

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.