USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/ 2/ 6 11:53:54.00

Epicenter: -11.254  165.734
MW 6.0

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/ 6 11:53:54.00
Centroid:  -11.054  165.836
Depth  13         No. of sta: 11
Moment Tensor;   Scale 10**17 Nm
  Mrr=-3.94       Mtt= 1.44
  Mpp= 2.49       Mrt=-9.13
  Mrp= 2.07       Mtp=-4.58
 Principal axes:
  T  Val= 11.09  Plg=29  Azm=215
  N     = -0.23      21      111
  P     =-10.86      51      351

Best Double Couple:Mo=1.1*10**18
 NP1:Strike=351 Dip=25 Slip= -28
 NP2:       107     78      -112

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.