USGS WPhase Moment Solution

SANTA CRUZ ISLANDS

13/ 2/ 7 18:59:16.00

Epicenter: -11.001  165.658
MW 6.7

USGS/WPHASE CENTROID MOMENT TENSOR
13/ 2/ 7 18:59:16.00
Centroid:  -10.801  165.556
Depth  11         No. of sta: 53
Moment Tensor;   Scale 10**19 Nm
  Mrr=-0.25       Mtt= 0.26
  Mpp=-0.02       Mrt=-0.69
  Mrp=-0.19       Mtp=-1.20
 Principal axes:
  T  Val=  1.43  Plg=14  Azm=218
  N     = -0.02      57      104
  P     = -1.41      28      316

Best Double Couple:Mo=1.4*10**19
 NP1:Strike=354 Dip=59 Slip= -10
 NP2:        89     81      -148

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.