USGS WPhase Moment Solution

SANTA CRUZ ISLANDS REGION

13/ 2/ 7  0:30:11.00

Epicenter: -11.664  164.960
MW 6.0

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/ 7  0:30:11.00
Centroid:  -11.764  164.858
Depth  11         No. of sta: 36
Moment Tensor;   Scale 10**17 Nm
  Mrr=-8.80       Mtt= 2.75
  Mpp= 6.04       Mrt= 3.13
  Mrp=-5.26       Mtp=-4.14
 Principal axes:
  T  Val= 10.77  Plg=17  Azm= 56
  N     = -0.04       1      146
  P     =-10.72      72      242

Best Double Couple:Mo=1.1*10**18
 NP1:Strike=144 Dip=28 Slip= -93
 NP2:       328     62       -88

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.