USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/ 2/ 8 15:26:39.00

Epicenter: -10.910  165.964
MW 7.1

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/ 8 15:26:39.00
Centroid:  -10.510  165.964
Depth  19         No. of sta: 58
Moment Tensor;   Scale 10**19 Nm
  Mrr= 0.27       Mtt= 0.58
  Mpp=-0.85       Mrt=-0.44
  Mrp= 1.51       Mtp=-4.71
 Principal axes:
  T  Val=  5.00  Plg=15  Azm=222
  N     =  0.04      71        9
  P     = -5.04       9      129

Best Double Couple:Mo=5.0*10**19
 NP1:Strike=265 Dip=72 Slip= 175
 NP2:       356     86        18

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.