USGS WPhase Moment Solution

SANTA CRUZ ISLANDS REGION

13/ 2/ 6  1:23:19.00

Epicenter: -11.232  164.921
MW 7.1

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/ 6  1:23:19.00
Centroid:  -11.632  164.309
Depth  11         No. of sta:  2
Moment Tensor;   Scale 10**19 Nm
  Mrr=-4.96       Mtt= 1.32
  Mpp= 3.64       Mrt= 0.02
  Mrp= 1.99       Mtp=-2.95
 Principal axes:
  T  Val=  5.90  Plg= 8  Azm=237
  N     = -0.43      12      329
  P     = -5.46      74      113

Best Double Couple:Mo=5.7*10**19
 NP1:Strike=312 Dip=38 Slip=-111
 NP2:       158     55       -74

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.